Re: GPIB filtered bulkhead connectors.
National Instruments and others offer GPIB to F.O. adapters. --- Luke Turnbull luke.turnb...@trw.com wrote: Group, Does anyone know where I can buy filtered bulkhead connectors for running GPIB cables through screened room walls. Approximate cost? Alternatively, does anyone know suppliers and cost for GPIB fibre-optic extenders. Thanks, Luke Turnbull --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc = Best Regards Hans T. Mellberg, By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 BSEE, NARTE Certified Engineer, IEEE, AIAA, dB, WG ANSI/IEEE C63.16 2004 IEEE EMC Symposium Program Chair, IEEE EMC SCV ADCOM __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
power-line LAN
What are the unique testing requirements for a power-line based LAN (i.e. the information is transported on the powerlines within a home as an example) for CE mark? Would the power line harmonics be an issue? ANy unique set-up besides a couple of devices exchanging info? Hans Mellberg __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
RE: Video Cameras for EMC Test Monitoring
While on the topic of cameras, does anyone make a fiberoptic version of a surveilance camera? --- richwo...@tycoint.com wrote: We enclosed our camera in screen mesh, but we had to verify that the enclosure did not affect the calibration of the room. We test up to 10V/m with no problems. Richard Woods Sensormatic Electronics Tyco International -Original Message- From: Sandi McEnery [mailto:smcen...@ustech-lab.com] Sent: Wednesday, January 15, 2003 1:35 PM To: emc-p...@majordomo.ieee.org Subject: Video Cameras for EMC Test Monitoring We are in the process of purchasing video cameras for monitoring EMC Immunity testing up to 10V/M. Pricing for cameras designed to withstand 20V/M is way high do any of you successfully use cameras that are not as sturdy? Or ... does anyone know where we might purchase a used system?? Sandi McEnery US Technologies 770-740-0717(ph) 770-740-1508 (fax) smcen...@ustech-lab.com mailto:smcen...@ustech-lab.com = Best Regards Hans T. Mellberg, Consultant Regulatory, High Speed, EMC and Power Design Services By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 BSEE, NARTE Certified Engineer, IEEE, AIAA, dB 2004 IEEE EMC Symposium Program Chair, IEEE EMC SCV ADCOM __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Notification required?
For a 2.4GHz SRD, I believe that this is now harmonized. Are individual country notifications still required? Thanks in advance Hans Mellberg __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Fiber optic cable testing per EN 55022:1998 ?
As a matter of fact the local SCV EMC society paper next week is about EM radiation from fiber optics. No, not from the glass or plastic itself!, but from the metalized reflector coating and also from the proximity of the Tx diode next to the connector. Actually measurable radiation! --- John Woodgate j...@jmwa.demon.co.uk wrote: I read in !emc-pstc that Tom Cokenias t...@tncokenias.org wrote (in v04205511ba4377eaa41d@[10.10.10.79]) about 'Fiber optic cable testing per EN 55022:1998 ?' on Thu, 9 Jan 2003: I'm wondering how to handle fiber optic cables under the new EN55022 going into effect August 2003. Measurements are supposed to be made on telecommunications cables, and fiber optic cables are being used for telecommunications. From my reading of the standard I don't see that they would be excluded, but neither do I see how they should be tested. Can you see any mechanism by which they would emit EM radiation below 400 GHz, or conduct it, or lack immunity to it? You don't have to do tests that are clearly not sensible. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list = Best Regards Hans T. Mellberg, Consultant Regulatory, High Speed, EMC and Power Design Services By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 BSEE, NARTE Certified Engineer, IEEE, AIAA, dB 2004 IEEE EMC Symposium Program Chair, IEEE EMC SCV ADCOM __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: European 3 Phase
No, 230V are not available in three phase. The 220/230/240V ARE derived from three phase voltages which are normally 380V or 415V and will converge somewhere around 400V per phase. --- rehel...@mmm.com wrote: What three-phase voltages are commonly available in Europe? Is 230 VAC three-phase readily available? Is wye or delta most common or doesn't it matter? Thanks, Bob Heller 3M EMC Laboratory, 76-1-01 St. Paul, MN 55107-1208 Tel: 651- 778-6336 Fax: 651-778-6252 === --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list = Best Regards Hans T. Mellberg, Consultant Regulatory, High Speed, EMC and Power Design Services By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 BSEE, NARTE Certified Engineer, IEEE, AIAA, dB 2004 IEEE EMC Symposium Program Chair, IEEE EMC SCV ADCOM __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: strange symbols (to me anyway)
Aren't we already using symbols not in 417 such as the Hazard Warning (exclamation in a triangle) which is an international(except US) road hazard sign? __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: FW: Bendable circuit boards
Flexible circuit boards have been used in standard and hi-rel circuits successfully for at least two decades or more! --- Brodie Pedersen brod...@nonin.com wrote: I have a design team looking at using a bendable circuit board in order for a certain fit in a plastic housing. Do any of you have information on reliablity, pitfalls, experiences with this type of circuit board implementation. Your help and suggestion will be greatly appreciated. Thanks in advance Brodie Pedersen QA Engineer Nonin Medical Inc. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list = Best Regards Hans T. Mellberg, Consultant Regulatory, High Speed, EMC and Power Design Services By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 BSEE, NARTE Certified Engineer, IEEE, AIAA, dB 2004 IEEE EMC Symposium Program Chair, IEEE EMC SCV ADCOM __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Location of CE DoCs
But if you analyze the grammatical construction of : and he or his authorised representative established within the Community That can be interpreted as follows: he is established within the community and in that absense, his authorized representative is established within the community. Therefore it can be implied defacto that either the manufacturer OR the representative reside within the EU and kkep the information within the EU. --- Richard Hughes rehug...@nortelnetworks.com wrote: Nick, Unfortunately, regarding the last para, you have not followed your own good advice of checking with the specific EU Directives concerned. Annex IV section 2 of the LVD requires: The manufacturer must establish the technical documentation described in point 3 and he or his authorized representative established within the Community must keep it on Community territory at the disposal of the relevant national authorities for inspection purposes for a period ending at least 10 years after the last product has been manufactured. Not surprisingly, the Commission's Guide to the LVD (2001 edition) states: This technical documentation must be kept within the Community. On the other hand, the RTTED does not state that the technical documentation must be kept within the Community. The corresponding para to the above (Annex II section 2) requires that: The manufacturer must establish the technical documentation described in point 4 and he or his authorised representative established within the Community must keep it for a period ending at least 10 years after the last product has been manufactured at the disposal of the relevant national authorities of any Member State for inspection purposes. Note that the part requiring that the technical documentation be kept on Community territory is absent. Equally, the LVD and the RTTED have different requirements regarding the provision of a DoC. See Article 6(3) of the RTTED. Own opinions as always, Richard Hughes -Original Message- From: Nick Williams [mailto:nick.willi...@conformance.co.uk] Sent: 11 December 2002 00:12 To: Stephen Irving Cc: emc-p...@majordomo.ieee.org Subject: Re: Location of CE DoCs These are indeed rumors. Different Directives have different requirements in this regard, and although the general rules of thumb that documentation should be kept in the EU and a copy of the DofC should be supplied with the product provide a good working basis for compliance with the Directives, they are by no means mandatory for all equipment under all New Approach directives. If it really matters to you, you should read the text of the specific directives which apply to your products in order to find out what is required. As examples, neither the LVD nor the EMC Directives require a copy of the EC declaration to be shipped with the product, although the Machinery Directive does. None of these three directives require the appointment of an Authorised Representative (only the medical devices directives do this) and ergo there is no requirement for the technical file to be 'kept on EU soil'. Regards Nick. = Best Regards Hans T. Mellberg, Consultant Regulatory, High Speed, EMC and Power Design Services By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 BSEE, NARTE Certified Engineer, IEEE, AIAA, dB 2004 IEEE EMC Symposium Program Chair, IEEE EMC SCV ADCOM __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Can 2.4GHz wireless phones be marketed in EU?
Question, Can 2.4GHz wireless phones be marketed in EU as SRD? Is there a chart or document similar to FCC's part 2.106? for frequency allocations in EU? Thanks in advance = Best Regards Hans T. Mellberg, Consultant Regulatory, High Speed, EMC and Power Design Services By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 BSEE, NARTE Certified Engineer, IEEE, AIAA, dB 2004 IEEE EMC Symposium Program Chair, IEEE EMC SCV ADCOM __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Meeting Notice, Tue, 10/Dec/02, An Overview of Recent Developments in Nanotechnology
Meeting Notice: The SCV IEEE/EMC and the Product Safety Society present: An Overview of Recent Developments in Nanotechnology. Time: 5:30 Social, 7:00 Presentation Place: Applied Materials Building 27, 3135 Kifer Road, Santa Clara CA. All Welcome, No entrance fee, IEEE membership not required to attend. We will also Vote for Officers for the Year 2003 on Tuesday, December 10, 2002, Time: 5:30 Social, 7:00 Presentation An Overview of Recent Developments in Nanotechnology Speaker: Dr. Meyya Meyyappan, Director, Center for Nanotechnology (NASA) Abstract: An Overview of Recent Developments in Nanotechnology Nanotechnology deals with creation of functional materials, devices and systems in the nanoscale through exploiting novel properties (electrical, physical, chemical ) arising solely due to the nanoscale. This is a broad enabling technology with expected impact on materials and manufacturing, electronics and computing, health and medicine, energy, transportation, national security and space exploration. The basic science and applications are of great deal of interest to the IEEE community. This talk will provide an overview of novel nanoelectronics concepts based on carbon nanotubes (CNTs) and molecular electronics, nanosensors and detectors, nanoelectromechanical systems (NEMS), nanoscale materials and fabrication techniques. Please join us and welcome Dr. Meyyappan who will provide you with a glimpse into this new exciting field of Nanotechnology. As usual, the December meeting will include Holiday snacks. Biography of Dr. M. Meyyappan Dr. M. Meyyappan is the IEEE Distinguished Lecturer for the IEEE Nanotechnology Council. He is the Director of the Center for Nanotechnology at NASA Ames Research Center in Moffett Field, CA. His Nanotechnology center, established in 1997, consists of about 50 scientists working on various aspects of Nanotechnology including carbon nanotubes for nanoelectronics, sensors and detectors, molecular electronics, inorganic nanowires for sensors and devices, protein nanotubes, Nanotechnology in gene sequencing, quantum computing, computational Nanotechnology, computational quantum electronics and optoelectronics. His center has strong academic ties through programs for undergraduate and high school interns, and visiting faculty and graduate students. For further information, please visit the web site Web: http://www.ipt.arc.nasa.gov Dr. Meyyappans research interests include nanoelectronics, nanodevices and sensors, CVD and plasma CVD approaches for growth of nanotubes and inorganic nanowires. He has published over 80 papers in refereed journals including 25 in Nanotechnology related subjects and has given over 50 Invited, Plenary and Keynote talks and Invited seminars in the last four years. He is a member of the Interagency Working Group on Nanotechnology (IWGN), which is responsible for the National Nanotechnology Initiative (NNI). He is the IEEE Nanotechnology Council Distinguished Lecturer. He is also the Conference Chair for the IEEE Nano2003 Conference to be held in San Francisco in August 2003. He has a Ph.D. from Clarkson University and is a member of IEEE, AVS, MRS, and ECS. He is on the Editorial Board of Journal of Nanoscience and Nanotechnology. Applied Materials, Bldg 27, 3135 Kifer Rd, Santa Clara, CA = Best Regards Hans T. Mellberg, Consultant Regulatory, High Speed, EMC and Power Design Services By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 BSEE, NARTE Certified Engineer, IEEE, AIAA, dB 2004 IEEE EMC Symposium Program Chair, IEEE EMC SCV ADCOM __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
prEN50731
Does anyone know anything about this proposed standard? any weblinks? Thanks in advance Hans Mellberg __ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Meeting Notice, tonight, Santa Clara Valley EMC Chapter
Tuesday, November 12th, 2002 A Brief History of the EMC antenna, and the Design and Construction of Antennas for EMC Details: - One of the key instruments that we use in the day to day business of EMC design and testing is the Antenna. The antenna is essentially a transition by which electromagnetic waves are radiated into free space or vice-versa. What is the history behind the development of the antennas we use today? What considerations were made for the antenna as it is used for EMC test and measurement? Please join us and welcome Stu Kron of Sunol Sciences who will provide you with a glimpse into the background, design and construction of the EMC antennas we presently use today. THE SOCIAL GATHERING WILL BEGIN AT 5:30pm AND THE MEETING WILL BEGIN AT 7:00pm TO FIND PAPERS FROM PAST MEETINGS CHECKOUT THE MEETING ARCHIVE! :: WE HAVE A NEW MEETING LOCATION... Meeting Place: Applied Materials Building 27, 3135 Kifer Road, Santa Clara, CA 5:30-8:00pm = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 __ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2 --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Official Languages of Countries
the CIA website has great descriptions of each country. Yes, that CIA!!! http://www.cia.gov/cia/publications/factbook/index.html --- Stephen Irving sirv...@lutron.com wrote: Hello everyone. My name is Steve Irving, and I am new to this forum. Does anyone know where to find a reliable, up-to-date list of the official languages of each country? This list would be useful to people selling products internationally, as many standards require instructions in the official language of each country of sale. Thanks for your help, Steve Stephen R. Irving Project Electrical Engineer Lutron Electronics, Co. Inc. +1 (610) 282 - 6468 +1 (610) 282 - 7324 [Fax] = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 __ Do you Yahoo!? HotJobs - Search new jobs daily now http://hotjobs.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Lab instruments for sale
As I no longer will be doing testing from my house and will be using third party labs instead, I will no longer have a need for these instruments and components. If interested, please view the list at: www.members.aol.com/hmellberg/Instruments_for_sale.txt = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 __ Do you Yahoo!? HotJobs - Search new jobs daily now http://hotjobs.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Question on Receiver EMI testing..
That reminds me of a set-top b-b receiver I was testing long ago. While it met all the class B specs both rad and susc., when placed on top of a TV there were interference issues because of the close proximity! (both from the TV and from the set-top!) Depending on your application, you may often have to test beyond the limits if your clientel is to remain satisfied! = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 __ Do you Yahoo!? HotJobs - Search new jobs daily now http://hotjobs.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: definitions?
Since we are dealing with management, i.e. power, the 126dB$ is likely to be based on a lot of dBWhat?s dB$ = 10 log (dBWants/dBWhats) Or we could simply do as a friend of mine does and refer to dB(dollar). What's that 10 meter chamber cost? About 126 dB(dollar). ;) Ghery But I always thought that money was power. Maybe you meant 63 dB$. Ed = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 __ Do you Yahoo!? Y! Web Hosting - Let the expert host your web site http://webhosting.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: definitions?
Milliard (F/Nrw/Dan.) or miljard (Sw.) stands for Billion. --- Ken Javor ken.ja...@emccompliance.com wrote: Excellent point. Don't the Brits refer to 1,000,000,000 as a milliard, or is that continental usage only? -- = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 __ Do you Yahoo!? Y! Web Hosting - Let the expert host your web site http://webhosting.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: EMC Chamber Relocation
on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 __ Do you Yahoo!? Yahoo! News - Today's headlines http://news.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
PCI low profile dc-dc
I am designing a PCI card that requires the use of several on-board dc-dc converters for 24V, 48V and a varialble V. Any suggestions to sources are greatly appreciated, Thanks in advance = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 __ Do you Yahoo!? Yahoo! News - Today's headlines http://news.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Water + Electricity
Magnetohydrodynamics (MHD) was first proved by placing electrodes across the Thames river and using Earth's magnetic field, a potential was measured due to the flow of water (containing naturally disolved ions ofcourse, or it wouldn't have worked!) I forgot who the scientist was, I want to say Maxwell, but can't be sure. = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 __ Do you Yahoo!? Yahoo! News - Today's headlines http://news.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Tantalum Capacitor Reliability
Nonetheless, inrush current aside, a 20V Tantalum is considered marginal for a 12V circuit if reliability is desired. A 60% derating factor was and is a typical max for reliability circuits, i.e a 30V min rated cap is recommended. Tantalums require additional derating than Al-electrolytics. Furthermore, switchers are notorious for destroying Tantalums due to the large and fast V-swings. I don't recall seeing too many Tantalums on switcher designs. --- Cortland Richmond 72146@compuserve.com wrote: Chris, The issue isn't voltage rating; low-ESR caps such as these are susceptible to excessive charging current at turn-on. At a former employer, we saw REALLY GOOD, expensive caps used on a computer's 5V bus exploding at turn-on, even ones rated at 50 volts. Replacing them with cheaper electrolytics (TEN volts!) took care of that. You might be able to alleviate turn-on stress by using a power-on monitor circuit to slow down the initial charge. But it'd be far cheaper to go to electrolytics. Cortland One of my colleagues is testing a new design. He has designed a buck-boost switching converter which has tantalum output capacitors. We have looked at his design and gone through the calculations. His output current is 4 A maximum. His output voltage is 12 VDC His caclulated ripple current is 800 mA. He needed a 120 mV ripple voltage, so he put 8 each of 68 uF, 20 V tantalum capacitors (with 150 mOhm ESR) in parallel on the output. Each cap is rated for approximately 800mA of ripple current. He has seen two failures of these capacitors during initial testing and demonstrations. Meanwhile, many initial units run fine. From what I can gather, he hasn't violated any design rules. He has 20V rated caps on a 12V circuit. He has a ripple current rating of 8 X 800mA (8 caps in parallel). It is tempting to just increase the voltage rating to 25V or 35Vbut why? Even if he does, how do you prove that the problem is fixed. It would take months of testing the new capacitors to get the history that we have on the existing design. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 __ Do You Yahoo!? Yahoo! Health - Feel better, live better http://health.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Coaxial Switches - use with spectrum analyzer and gear?
The HP 8568B as an example, uses an SMA coax switch to switch between the BNC and N external Input connectors. Behind the front panel rigid coax is used to route to the SMA coax switch. --- Ken Javor ken.ja...@emccompliance.com wrote: I saw that but it makes no sense - there are coax switches in EMI receivers that take inputs from antennas making EMI measurements, looking at microvolt inputs. -- From: richwo...@tycoint.com To: emc-p...@majordomo.ieee.org Subject: RE: Coaxial Switches - use with spectrum analyzer and gear? Date: Thu, May 23, 2002, 3:36 PM That information is from an application document found on the Dow Key web site. I can't say that I fully understand it myself. Richard Woods Sensormatic Electronics Tyco International -Original Message- From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Thursday, May 23, 2002 3:59 PM To: richwo...@tycoint.com; emc-p...@majordomo.ieee.org Subject: Re: Coaxial Switches - use with spectrum analyzer and gear? I don't understand the snipped statement below. Isn't the loss just a fraction of the power flowing through the switch? -- From: richwo...@tycoint.com To: emc-p...@majordomo.ieee.org Subject: RE: Coaxial Switches - use with spectrum analyzer and gear? Date: Thu, May 23, 2002, 12:22 PM A minimum power of about -20dbm must be used to overcome the losses in the switch. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA office:831-454-9450, cell:408-507-9694, fax:831-454-0755 __ Do You Yahoo!? LAUNCH - Your Yahoo! Music Experience http://launch.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: DSL on residential buildings.
I may have gotten in on the tail end of the dicussion, but here is my take on residential DSL. The FCC rules are quite clear on equipment marketed to residential environments, Class B. The DSL equipment being sold to residences must comply with class B limits notwithstanding office use. small, non-rack mounted routers and switches are probably still being argued as class A devices although most major mfg make them already as class B. Eventually, when a lot of homes incorporate hubs and routers then those will also have to be class B. --- Cortland Richmond 72146@compuserve.com wrote: The reason for the Part 15 residential (Class B) limit is to protect reception, and the levels prescribed are (arguably) low enough to do so. If we allow higher levels, we are asking for service calls and perhaps official attention. But (unless I am mistaken) it is now the USER who responsible for interference generated by his Class A devices, and it's perfectly legal for us to sell them to him. I recently spent some years working for a company that makes telecomm equipment. I there encountered for the first time the telco point of view (which is probably not uncommon). In the telephone world, the service provider is responsible for everything up to the network interface. Everything beyond that is the responsibility of the customer. Therefore, some people assume that equipment installed prior to the NIC can be, and should be Class A for Part 15. I have argued, with success, that this is an error with potentially expensive consequences. Part 15 contains an exemption for equipment located within a facility - even just a locked room, cabinet or vault - controlled by the telco. There is an argument, which I make, that when we do this in a residential building, if we are NOT Class B compliant, we may wish we had been. (Even Class B is often not enough, and I have seen equipment meant for customer use whose specification was well below the FCC limit.) And though our employers' products may comply with Part 15 we are still liable for harmful interference. However, emissions may be suppressed by other means than installing only Class B equipment and this is often the way to go. The utility exemption does make this easier. I personally believe that one may make a case for the mechanical room being Class A. It often contains furnaces, motors, and many other unregulated devices which generate high levels of radio and television interference, and to impose a stricter standard on telecom equipment in the same place seems a bit of a reach. But look at the environment! Will emissions reaching a customer location be above the Class B limit? If so, then I would say due diligence requires suppressing them further. A vault in a steel reinforced building's basement is a different matter than a rooftop utility hut with TV antennas just 3 meters away. If deployment entails a wide range of installations, then it is probably best to suppress all of it to Class B, rather than install Class B retrofit kits on a case-by-case basis. This is a decision I believe has to be made when the product is proposed. Regards, Cortland Richmond (unemployed, and looking) --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Yahoo! Sports - live college hoops coverage http://sports.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable
RE: Earthing of conductive floor tiles
Several years ago I was called in to debug a chamber that had spurious emissions whilst turning the table. Naturally, everyone accused the tt manufacturer but after several hours of frustrating dead ends, it turned out that the small amount of vibration caused by the tt was causing the floor tiles to move and shift ever so slightly. This was enough for small amounts of static charge to develop and discharge causing the emissions in the chamber. Once this was ascertained, grounding the floor tiles eliminated the problem. We used copper tape under every tile folded over till the tile manufacturer came in with a permanent solution which included spring fingers. These metal lined tiles were for a false raised floor for cabling and a/c and not the ferrite types. --- David Spencer dspen...@oresis.com wrote: Hi Arno, John gave you the short answer...the MFG should have installation instructions. In all of the installation I have been party, there is a grid of copper tape laid down in the conductive adhesive. This keeps the adhesive from getting excessively resistive over large areas. Surface resistance tests run anywhere from 100k-400k ohms when it's all done. Note that if you are installing relay racks or metal benches that you can run into ground loops. Have a Great Day, Dave Spencer Oresis Communications -Original Message- From: Arno van Kesteren To: Arno van Kesteren; emc-p...@majordomo.ieee.org Sent: 3/18/02 1:48 PM Subject: Earthing of conductive floor tiles Dear Group, Do conductive tiles in floors for ESD prevention have to be connected together (e.g. through a low impedance earth bond) ? Arno van Kesteren ESO Munich, Germany e-mail: avkes...@eso.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Yahoo! Sports - live college hoops coverage http://sports.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: SV: Screened Room Ambient Scans
While you do mention the screen room, a word of caution for using pre-amps on OATS. When there are strong ambients such as nearby TV and Radio stations, there are quite a bit of intermodulation products as well as bleeding. I see that often and I sometimes have to switch between amp and no-amp to determine if the signal seen with the pre-amp is real. Another caution is when measuring signals near the noise floor and amplifying them does not give accurate levels. I have seen as much as a 10 dB error when you amplify signals near the floor level. Some amplifiers are better than others! --- Greilich, Jeff jeff.greil...@asl-tk.com wrote: John, You hit it on the head. The reason for the first preamp is to overcome line losses and the second preamp would be used if a spectrum analyzer is being used in lieu of a CISPR Receiver. Regards, Jeff -Original Message- From: John Woodgate [mailto:j...@jmwa.demon.co.uk] Sent: Thursday, February 28, 2002 2:03 AM To: emc-p...@majordomo.ieee.org Subject: Re: SV: Screened Room Ambient Scans I read in !emc-pstc that h.knud...@niros.com wrote (in DCFCB38F97E9CF46 bdb4d995ffdd83282bb...@mail.daniro.dk) about 'SV: Screened Room Ambient Scans', on Wed, 27 Feb 2002: May be you should consider a pre-amplifier. Is there any reason to use a preamplifier apart from the possibility that its noise figure may be better than that of the spectrum analyser? It seems unlikely that it would be much better than that of a CISPR receiver. Or do you mean a preamplifier at the antenna, to send a larger signal to the antenna cable and thus to the analyser or receiver? -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Yahoo! Sports - sign up for Fantasy Baseball http://sports.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Vietnam regulations?
What, if any, requirements does Vietnam have for EMC, Safety and telco for DSL/E1/T1 type of products? Thanks in advance = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Yahoo! Sports - Coverage of the 2002 Olympic Games http://sports.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Re: Using PCB traces as transient voltage suppressor
I designed those in the late 70's in PCB's while at Experimental Physics Corp. They have been used with various degrees of success (depends on your expectations!) The major problem is the lack of predictability of the switch voltage. Many factors such as exact radius of the tip, solder mask and type or avoidance of, etc. But, they do work if you do not expect a narrow range of switch V threshold. For basic OV protection with additional better OV networks downstream, they work fine. --- Gabi Hoffknecht gab...@simex.ca wrote: Hi all, I have seen PCB designs with two triangular shaped copper pads pointed towards each other at very close proximity, meant as an air gap discharge path for transients. Does anyone have information about such designs, whether they work and how well ? At a breakdown voltage for air of 1 Megavolt per meter, they should theoretically work: 10mil distance would have a breakdown voltage of only 254V. Such a PCB design basically comes for free, so I was thinking of adding it on top of my already existing series impedance - TVS network. Thanks in advance for your comments. Best regards, Gabi Hoffknecht --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Yahoo! Sports - Coverage of the 2002 Olympic Games http://sports.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Harmonics, WAS: 2 Phases in North America
If one uses the analogies from tuning forks, then it should be obvious. The first harmonic or the fundamental, is the the first sympathetic resonance of the adjacent tuning fork which happens to be the fundamental. And, it so happens that by definitions the first harmonic IS the fundamental. It is not usually referred to as by the order of; It simply is the first, second, third etc harmonic of the fundamental. A harmonic frequency does NOT imply a multiplier of, but one that sympathetically resonates with the fundamental. = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Check out Yahoo! Shopping and Yahoo! Auctions for all of your unique holiday gifts! Buy at http://shopping.yahoo.com or bid at http://auctions.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: 2 Phases in North America
ok folks. This topic needs to be clarified. With respect to each other, by definition, two conductors have a potential difference at 180 degrees. Period. The 90 degree stuff may pertain to current but not to voltage. You would need a four-phase transformer to get 90 degree phasing and simply it does not exist. Voltage, is usually measured: wrt ground, wrt other reference conductor such as neutral or wrt to another voltage (hot) conductor. In some cases, the voltage difference between ground and two other conductors may be 120/240 degrees such as in a three phase system. So, no matter how you measure voltage it will either be at 120, 180 or 240 degrees wrt to some other conductor. In the US there have been many systems of low voltage (staying below 480V)distribution yielding the following voltages: 480/240/120 480/208/120 from three three phase 480/230/115 single split phase 230/115 single split phase motor control voltage 220/110 single split phase older home voltages 208/120 from three phase 480/277 (for fluorescent lighting) 117 (where did this come from? seen in many older HP instruments) Open Delta (3, 4 or 5 wire, when one is grounded into neutral its called a stinger) Split phase (three or four wire) Y (four and five wire) Hope this stirrs the pot = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Check out Yahoo! Shopping and Yahoo! Auctions for all of your unique holiday gifts! Buy at http://shopping.yahoo.com or bid at http://auctions.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
TONIGHT, Social and Holiday meeting, Santa Clara Valley EMC Society
Tonight, at SGI Mountain View from 5:30 to 8:30pm, is the perfect opportunity to meet other EMC, SI and Safety types at the Santa Clara Valley's annual social and Holiday event. No charge, all is gratis and all SI, EMC and Safety related personnel and engineering students are welcome. Visit our website for details: www.scvemc.org Hans Mellberg Chair, Santa Clara Valley Chapter of IEEE's EMC Society = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Check out Yahoo! Shopping and Yahoo! Auctions for all of your unique holiday gifts! Buy at http://shopping.yahoo.com or bid at http://auctions.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
EFT Testing and Common Pitfalls, Meeting Notice, Santa Clara Valley EMC Society Chapter
Meeting notice for TUESDAY, October 9th at SGI in Mountain View. Social begins at 5:30pm and presentation at 7:00pm Please visit our website for full details including map. www.scvemc.org EFT Testing and Common Pitfalls, Meeting Notice, Santa Clara Valley EMC Society Chapter By: Doug Smith Details: - Doug Smith, will cover the background of EFT testing (IEC 61000- 4- 4) w along with common pitfalls. Doug will also share some tips on the testing process. Doug believes that all talks should have some entertainment value and this talk is not an exception. War stories and demonstrations will be used throughout the talk. One of these covers a common mistake that some testing labs make that can nearly double the stress on the EUT. If you have an EFT Burst Generator what do you do with it when it is not being used (probably most of the time unless you work for a test lab)? Doug will cover some test / debug techniques using an EFT generator that have nothing to do with EFT, such as solving ESD problems and measuring noise margins at the PWB and circuit trace level. Mr. Smith held an FCC First Class Radiotelephone license by age 16 and a General Class amateur radio license at age 12. He received a B.E.E.E. degree from Vanderbilt University in 1969 and an M.S.E.E. degree from the California Institute of Technology in 1970. In 1970, he joined ATT Bell Laboratories as a Member of Technical Staff. He retired in 1996 as a Distinguished Member of Technical Staff. From February 1996 to April 2000 he was Manager of EMC Development and Test at Auspex Systems in Santa Clara, CA. Mr. Smith currently is an independent consultant specializing in high frequency measurements, circuit/system design and verification, switching power supply noise and specifications, EMC, and immunity to transient noise. He is a Senior Member of the IEEE and a member of the IEEE EMC Society Board of Directors. His technical interests include high frequency effects in electronic circuits, including topics such as Electromagnetic Compatibility (EMC), Electrostatic Discharge (ESD), Electrical Fast Transients (EFT), and other forms of pulsed electromagnetic interference. He also has been involved with FCC Part 68 testing and design, telephone system analog and digital design, IC design, and computer simulation of circuits. He has been granted over 15 patents, several on measurement apparatus. Mr. Smith has lectured at Vanderbilt University, ATT Bell Labs, and at many public and private seminars on high frequency measurements, circuit design, ESD, and EMC. He is author of the book High Frequency Measurements and Noise in Electronic Circuits and is currently working on his second book. = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? NEW from Yahoo! GeoCities - quick and easy web site hosting, just $8.95/month. http://geocities.yahoo.com/ps/info1 --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Cancellation of Tonight's IEEE SCV EMC Chapter's Social meeting
Regrettably and out of respect for National events, the annual Social Event and Festivities are hereby cancelled. Our sincere condolences to those with affected families. The Technical presentation program will resume as usual on the second Tuesday of October. Regards Hans Mellberg Chair, Santa Clara Valley Chapter of IEEEs EMC Society __ Do You Yahoo!? Get email alerts NEW webcam video instant messaging with Yahoo! Messenger http://im.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
RE: ESD - time between successive discharges
Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall, --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall, --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall, = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall,
RE: article 27.4 of IEC 61558-1
Does anyone have the text of article 27.4 of IEC 61558-1? That is the only portion I beed. Its a transformer standard and about a hot filament test? Thanks in advance = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall,
Re. Product Safety Testing of transformer
Fellow listers; If you are aware of a laboratory(ies) in the SF Bay Area that can perform safety testing on transformers, please email me off-list with contact info. An urgent situation warrants a quick turn-around. Thanks in advance = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail http://personal.mail.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall,
RE: Typing Shortcuts - the directive
Chris Chileshe; A copy of this new directive should be required reading in all electromagnetic compatibility and or product safety seminars and courses. It will make things better such as shortened messages thereby reducing the bandwidth messages occupy on the net. Not to mention the improved efficiency of the adopting staff. The benefits seem endless. Bravo to a piece well written albeit some references of cities on the wrong coast. Best Regards Hans Mellberg Electromagnetic Compatibility Systems Design Consultant In Beautiful Santa Cruz, California, United States of America = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Spot the hottest trends in music, movies, and more. http://buzz.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall,
Re: Shielding Effectivness Question
Neven; In the near field one must know whether the offending emmiter is mostly generated from a magnetic loop or electric field antenna structure. Once that is known, the eventual transmitted portion can be computed. If your shielding is non Fe, Ni or Co and the source is of a magnetic loop nature then there will be minimal attenuation. If the source resembles an electric field antenna (less likely at lower frequencies) then the usual shielding formulae may apply since they are primarily based on E-fields to some extent and you will have attenuation. = Best Regards Hans Mellberg Regulatory Compliance EMC Design Services Consultant By the Pacific Coast next to Silicon Valley, Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail - only $35 a year! http://personal.mail.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall,
RE: AC Power Primer?
Daren, you bring up an interesting point. California's energy woes could possibly be band-aid if the voltage was reduced 10%. (maybe that is too big of a management issue, does anyone know?) Assuming that a large percentage of the users don't have switcher regulators then that would equate to a 5-9% reduction in energy consumption hence reducing California's power problems significantly till more power plants are built. That might lower the spot market price! --- Nerad, DarenHS-SNS daren.ne...@hs.utc.com wrote: It all boils down to $$$s! Notice you don't see 110 V on the lines, probably not even 115 or 117 but as close to 120V as they can keep it (except for you folks in CA, then this is a digital thing, HA!). WHY? You consume more Watts if the V is greater! Check your wall outlet, what does it read? IT would be interesting to use this forum to do a quick dirty survey. Granted we can only hit where engineers feel like making measurements, when they do, but it would be interesting... Daren A. Nerad EMC Engineer = Best Regards Hans Mellberg Regulatory Compliance Consultant and Design Services By the Pacific Coast next to Silicon Valley Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall,
RE: AC Power Primer?
The US 220 came from the days of single phase split winding transformers yielding 110 to Neutral. Not a three phase thing but, the open-delta two phase transformers used in residential distribution, were two split winding transformers wound is a three phase style with the third winding missing. It also provided splits for 110V and are truly a two phase system. But a matter of semantics. The open delta transformer was a cost reduced virtual three phase!!!. --- mkel...@es.com wrote: Just out of curiosity, where does the designation 220V come from? If you measure the potential difference between two phases of a three-phase system, you get 208V. If you measure the difference between the two phases in a residential or light commercial area, you would probably get 240V. So, where does the term 220V come from? Thanks, Max Kelson Evans Sutherland = Best Regards Hans Mellberg Regulatory Compliance Consultant and Design Services By the Pacific Coast next to Silicon Valley Santa Cruz, CA, USA 408-507-9694 __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall,
Re: Odd CE mark...
Toy Directive is my guess!!! Hans --- David Gelfand gelf...@memotec.com wrote: What directive covers this? http://www.elderly.com/vintage/items/images/40U/40U-2712_headstock-back.jpg David --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall, __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall,
Reminder, Today's talk, Santa Clara Valley EMC Society
SCV EMC Society Meeting Emerging standards for Europe Tuesday, February 13, 2001 The February meeting of the Santa Clara Valley EMC Society will be held at SGI in Mountain View, 1600 Amphitheatre Pkwy., building 40, in the Presentation Center above the lobby. The social gathering will start at 5:30 PM, and food and drinks will be available. The technical presentation will start at 7:00 PM. The speaker is Jerry Ramie of ARC Technical Resources, Inc., a 20-year veteran of Regulatory Compliance, EMC, and RF/Microwave measurement instrumentation. The presentation concerns the marketing of consumer, commercial, medical, or light industrial products in the European Union. Please visit our website for more complete details. Our monthly Spectral Lines is also on-line. www.scvemc.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Reminder; Today, SCV EMC Society presents:
Tuesday 7:30pm, January 9th, 2001 at SGI, Mountain View, CA (snacks and refreshments from 5:30pm) The Basic Physics of Electromagnetics Without Abstract Mathematics by:Scott Bennett (retired) Please visit our website for details: http://www.scvemc.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
RE: Seeking assistance from Chemical Experts
At 01:40 PM 1/2/01 -0700, Kenneth McCormick wrote: Thanks guys...BUT, I am not trying to convince UL that I am correct. This is all internal to the company I am working with. There are at least four chemical compositions that qualify for the term petroleum spirits You can find their specification at the ASTM website http://www.astm.org/DATABASE.CART/PAGES/D235.htm The spec you want is: D235-99 Standard Specification for Mineral Spirits (Petroleum Spirits) (Hydrocarbon Dry Cleaning Solvent) --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re: Screen Room
it would help to know where it is located At 08:28 AM 12/21/00 -0800, Jim Bacher wrote: I (not my employer) have a 8ft x 8ft x 9ft, copper screen room that I need to get rid of. If you know of a University who would like to have one, have them contact me. They are welcome to have it for free, as long as they show up with a truck and pick it up. If I can not find a University to give it to, then I will take offers for it. If you are interested in buying it please contact me and I will get back to you, if I can not find a University to donate it to. Jim Bacher 937-898-1615 jab...@yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re: Network Analyzers
The HP application notes are pretty handy for that such as 95-1 S-parameter Techniques 154 S-parameter Design and there are a lot more specific to network analyzers They also have tutorials: http://www.tm.agilent.com/classes/ProdSearch?md=brview=Tutorialsletter=al anguage=englocale=USqt=referrer=TechSupport good luck At 02:43 PM 12/28/00 -0700, Michael Taylor wrote: A new years greetings to everyone. An off the wall question I am sure someone out there can answer. Does anyone know of a Structured Learning or Self learning course (or book) on Network Analyzer operation and results interpretation that I can use to help train a technician. I don't have the time and was hoping there was something available like a Network Analyzer version of Windows-95 for dummies, or practical operation of network analyzers. Something he could refer to when required to perform some simple tests. I have explained the basic operation several times but he seems to still get himself (and the instrument) confused. I was hoping someone may know of a source of entry-mid level training materials. I have tried HP with no luck so far. Nothing exotic, just the basics - transmission - return loss - smith plot - etc. Any all ideas gratefully received. Best wishes to everyone for a new year better than last and continued employment to retirement. Best regards, Michael Taylor (frozen in Colorado) --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Reminder, Today, December Meeting of SCV Chapter of the EMC Society
Free food and soft-drinks will be available till theyre gone, starting at 5:30pm! Everyone interested in the topis is invited to attend. This month's meeting of the Santa Clara Valley Chapter of the IEEE EMC Society is presenting: Richard Nute, who will give us a presentation on equipotentiality and grounding. The meeting will be held at SGI in Mountain View on Tuesday 12 December with the presentation starting at 7:00 PM. The Chapter's newsletter Spectral Lines with more details and the map are available from our web page at http://www.scvemc.org/ __ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
RE: Coaxial cable
Actually it is called a Z fold as it imitates a squashed letter z when folded. The foil is folded that way so it makes continuous circumpherential contact. Not all manufacturers employ a Z fold or equivalent method and their coax cable's performance is degraded. The Z fold is much better than an overlapping non-contacting or a spiraling foil. Hans --- Gary McInturff gary.mcintu...@worldwidepackets.com wrote: Nicely put, but I want to emphasize one point. The foil in most cables doesn't have a metal to metal contact. Where the foil overlaps itself the polyester on the underside is what is in contact with the foil outside. The type cable you are mentioning is called ane fold if I remember correctly, but I don't kno why. A lot of folks don't realize that they are not getting foil to foil contact, just and overlap of material. Gary -Original Message- From: jrbar...@lexmark.com [mailto:jrbar...@lexmark.com] Sent: Tuesday, November 07, 2000 8:58 AM To: sergioro...@siemens.com.br; emc-p...@ieee.org Subject: Re: Coaxial cable Sergio, A foil braid shield is quite common on high-speed cables. If a cable is properly terminated and you don't have common-mode problems, most of its radiated emissions will be from holes in the shield. Thus optical coverage, the percentage of the shield's nominal area that is actually covered by wires/conductive foil, is a reasonable approximation to the shielding effectiveness. It is very difficult to braid wires in a way that achieves over 95% optical coverage. A foil shield, with the overlap folded over so the conductive surfaces touch, can easily achieve 100% optical coverage, but is fragile. If a foil-shielded cable vibrates, or is repeatedly bent, the foil will eventually tear. Even if end-to-end continuity is retained, this hole in the shield can cause a great increase in radiated emissions. By braiding wires over the foil, you start out with 100% optical coverage, and if/when the foil tears degrade in just that area to the 90-95% optical coverage of the braid. We used to use a type of parallel cable for Electromagnetic Compatibility (EMC) testing that had a foil shield. We would get about three weeks use out of these before they went bad and had to be thrown away because of excessive radiated emissions. I helped develop and release an IEEE-1284 parallel cable in 1994 (Lexmark partnumber 1329605) that used a foil braid shield, and we put these in our EMC lab. It took nine months of heavy use before the first of these cables exhibited a noticeable increase in emissions over brand-new cables. John Barnes Advisory Engineer Lexmark International --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org = Best Regards Hans Mellberg __ Do You Yahoo!? Thousands of Stores. Millions of Products. All in one Place. http://shopping.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Pre-owned EMC equipment for sale
For sale; 1) Single phase 15A LISN, 9kHz-80MHz 2) Tilt antenna tower base for square mast 3) Antenna holder trolley with air piston for h and v polarization for square shaft mast. 4) Velonex V-3300 EFT and Burst generator. Contact me off-list for more details. __ Do You Yahoo!? Yahoo! Messenger - Talk while you surf! It's FREE. http://im.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re: Capacitor Electrolytic Fluid - restrictions
I have been using Diala-X by Shell which was the replacement for PCB dielectric oil. It has an MSDS. = Best Regards Hans Mellberg __ Do You Yahoo!? Get Yahoo! Mail Free email you can access from anywhere! http://mail.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
RE: Archives
Could someone please give me the url of the archives of this list? I used to have it but it got deleted a while back. Thanks in advance = Best Regards Hans Mellberg __ Do You Yahoo!? Get Yahoo! Mail - Free email you can access from anywhere! http://mail.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re: Heat sink temperature rise
--- Robert Macy m...@california.com wrote: Just my two cents worth with regard to temperature: It is my understanding that for every 10C rise the life of the part is half what it would have been. - Robert - That's a good approximation for silicon based semiconductors. If your product is specified at a maximum ambient of 40C as most are, then you must allow for the thermal rise above that. It may very well have to be labeled and/or deemed inaccessible to operator (meaning more labels, tool access etc.) = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Send instant messages get email alerts with Yahoo! Messenger. http://im.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re: Microwave Cables
--- umbdenst...@sensormatic.com wrote: Friends, We have been performing EMC measurements below 1 GHz. Now we need to do measurements for 2.5 GHz systems to the 10th harmonic (25 GHz). What kind of coax (or other cable) have you found suitable for testing this frequency range on an OATS? Type and vendor would be appreciated. Also, a brief description, such as flexible, rigid, diameter, loss characteristics, typical connector system, etc would help. Any cable (or measurement) tips would be appreciated. Thanks, Don Umbdenstock Sensormatic I have used Andrews 1/4 superflex as it is rated to 20GHz with low loss. It is not exactly flexible and more suited for permanent instalations. If you do not have to go to 25GHz then you can use their 3/8 or 1/2 for even lower loss (and less flexibility) but the high frequency performance begins to deteriorate. That particular type of coax is corugated and uses closed cell dielectric material to minimize hygroscopic affinity. Another vendor of low loss coax cables is a German manufacturer Rosenberger = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Send instant messages get email alerts with Yahoo! Messenger. http://im.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
[SI-LIST] : May 9th Presentation: Radiation from Edge Effects in Printed Circuit Boards (PCBs)
Bring a colleague Please Post Free Admission The Santa Clara Valley Chapter of the IEEE EMC Society is presenting on May 9th, at: Silicon Graphic's Cafe Iris Building 5, 2025 Stierling Court Mountain View CA Dinner: 5:30-7:30pm Presentation: 7:30-9:00pm May IEEE EMC Chapter Meeting Presentation Presenters: Dr. Zorica Pantic-Tanner, Director, School of Engineering, San Francisco State University, Franz Gisin, EMC Manager, Nortel Networks Title: Radiation from Edge Effects in Printed Circuit Boards (PCBs) Details - Propagating electromagnetic fields are generated whenever charge is accelerated. The polarization, direction, and mode of these fields are dependent on the structure that contains the accelerated charge. In printed circuit boards (PCBs), they include radiation from unwanted parasitic modes associated with tangential (planar) structures such as traces routed on outside layers (microstrip), and traces routed between ground and power planes (striplines). Structures normal to the ground and power planes such as vias also generate surface waves in the dielectric strata directly adjacent to the outside ground/power planes, and radial TEM waves between internal ground and power planes. As these fields propagate outward, they encounter the edge of the PCB. The edge presents a boundary discontinuity, and a portion of the energy in the propagating fields is reflected back into the PCB structure, a portion radiates outward from the edges of the PCB, and, depending on the angle of incidence, a portion also propagates tangentially around the edge of the PCB, exciting natural resonant modes within the PCB that also contribute to the total radiated energy. Using analytical modeling tools such as the Finite Difference Time Domain (FDTD) method and Fast Fourier Transform (FFT) algorithms, one can isolate the time and frequency domain components each of these various propagating modes have on the total radiation from PCB edges, and evaluate the effectiveness of such popular edge radiation minimization techniques as adding a row of closely spaced vias that short together all the ground planes within a multi-layer PCB (fences), and pulling back the power planes from the edges. The presentation includes a brief theoretical analysis of each of the different kinds of propagating modes, the effect the PCB edge has on each mode, and how fences and pulled-back power planes affect the total radiation efficiency from the PCB edge. The presentation also includes several time-domain animations that enhance the physical understanding of how these propagating modes produce radiation along PCB edges. Dr. Zorica Pantic-Tanner is Director of the SFSU School of Engineering, and Director of the SFSU Center for Applied Electromagnetics, a research facility that provides resources for theoretical and experimental studies in applied electromagnetics. She received her B.S., M.S., and Ph.D. degrees in Electrical Engineering from the University of Nish in 1975, 1978, and 1982, respectively. After graduating she became an Assistant Professor and then Associate Professor in the Department of Electronic Engineering at the University of Nish. In 1984 she was awarded a Fulbright Scholarship for postdoctoral research in the area of Applied Electromagnetics with the Electromagnetics Communications Lab of the University of Illinois at Urbana-Champaign. In 1989 she joined the School of Engineering at San Francisco State University. Dr. Pantic-Tanner's research and teaching interests are in the areas of Electromagnetic Field Theory, Applied Electromagnetics and Electromagnetic Compatibility (EMC). She has published over 50 conference and journal papers in these areas. Dr. Pantic-Tanner is Chair of the Santa Clara Valley Chapter of the IEEE EMC Society, a member of the IEEE EMC Society Education Committee, and Vice-Chair of the IEEE EMC Society Technical Committee TC-9 on Computational Electromagnetics. Under the IEEE EMC Society sponsorship, she has also developed and taught several EMC courses. Franz Gisin is EMC Manager at Nortel Networks. He received his B.S. degree in electrical engineering from the University of Idaho in 1972, and his M.S. degree in Applied Mathematics from the University of Santa Clara in 1986. Franz has been active in the EMC community for over 25 years, and has published numerous papers ranging from measurement uncertainties associated with 1/R extrapolation on OATS to mechanisms of common mode radiation from PCBs with attached cables. He is a past EMC Society Distinguished Lecturer and a past member of the EMC Society Board of Directors. Currently he is steering committee chair of the 2004 IEEE International Symposium on Electromagnetic Compatibility. He also teaches electromagnetics (on a part-time basis) at SFSU. = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Send instant messages get email alerts
RE: Material for magnetic shield
Typical manufacturers are: Magnetic Metals, Arnold Engineering, Thomas and Skinner, Tempel Steel Co., Magnetics Inc., and more. --- ajm...@us.ibm.com wrote: Hello Group, I was able to get a sample of transformer steel (about 12-15 mils thick), and it seems to work great for my magnetic shielding application. Now I need to provide specs for this material for the procurement, and the person who gave me the material called it 12-mil shearing. Can anyone give the technical specs for the material, and its likely sources. Stefan Hipskind, who suggested this material, described it as Transformer, or Silicone Steel (M19 or M26). Regards, Ravinder PCB Development and Design Department IBM Corporation Email: ajm...@us.ibm.com *** Always do right. This will gratify some people and astonish the rest. . Mark Twain --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson: pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Send instant messages get email alerts with Yahoo! Messenger. http://im.yahoo.com/ --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
Re: Ambient Cancellation Device for OATS
One method is to use two antennae. Then only the difference is the emissions of your EUT as the second antenna is farther away from the EUT. I believe that Cassper, after DSP, subtracts one reading from the other but I have seen a site using two spectrum analyzers instead for each antenna. --- Doug dmck...@gte.net wrote: Perhaps it's because I've never understood ... How exactly does one do ambient cancellation at an OATS? = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
[SI-LIST] : March 14, EMC Society Meeting Notice, Shielding and Grounding for GHz Processors and Beyond
The Santa Clara Valley Chapter of IEEE's EMC Society is pleased to announce its March 2000 Meeting Notice. No admission fee, All welcome, Bring a colleque. Visit our website for driving directions and more info; www.scvemc.org When/Where: Tuesday, March 14th, 2000. Silicon Graphics Café Iris, Building 5, 2025 Stierlin Court, Mountain View, CA. Time: 7:30pm - 9:30pm. Topic/Speaker: Shielding and Grounding for GHz Processors and Beyond By: Bertram K.C. Chan, Ph.D. Details: Shielding and Grounding for GHz Processors and Beyond The radiated emission levels of systems, driven by multiple microprocessors operating at 1 GHz and beyond, may be effectively mitigated by the various grounding and shielding designs. Bert will discuss ways to reduce Common Mode Reduction at All I/O Ports using what Bert calls The Quiet Ground. In his presentation, Bert will cover ways to reduce emissions at the source using specially designed grounding devices. He will also cover hard grounding of the main PCB in computers. Enclosures play a major roll in reducing emissions from Information Technology Equipment as you will find out as Bert discusses effective shielding that is designed to provide 90/180-degree coverage on all the seams of your product. Please join Bert and hear his thoughts on effective EMC Design. Biography: Bertram is an RD Scientist and EMC Engineer with extensive experience in Network Servers, Personal Computers, Space Systems and Nuclear Systems. Bertram has strong analytical and mathematical capabilities, with effective application of EM theory to EMC Compliance design and testing. Currently a Consultant, Bertram's experience includes 2 years with Hewlett-Packard Company, 7 years with Apple Computer Inc., 10 years with Lockheed Missiles and Space Co. Inc. 2 years with the Atomic Energy Commission of Canada, and has been Tenured Professor, Division Chairman of Mathematics and Physics, and lecturer at several Universities throughout the world including San Jose State University, Atlantic Union University, Middle East College and Loma Linda University. Bertram holds a Ph.D. in Engineering, as well as an MS and BS in Mathematics, Chemistry and Computer Science, and has published several textbooks, a multitude of scientific research papers and has 2 patents pending. = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com To unsubscribe from si-list or si-list-digest: send e-mail to majord...@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu
[SI-LIST] : SSN and Power Plane Bounce, 8th February Presentation
The Santa Clara Valley Chapter of the EMC Society is presenting on the 8th of February, 2000 Simultaneous Switch Noise and Power Plane Bounce, by Larry Smith, Sun Microsystems. Free admission, all welcome. 5:30-7:30 pm. social, food and refreshements (there is a charge for food and refreshements) 7:30-8:30 pm. Presentation: Simultaneous Switch Noise (SSN) has traditionally been thought of as an inductance problem. Modern electronic packages with solder bumps, solder balls and power planes have very low inductance. The SSN problem is shifting from an inductance problem to a power plane bounce problem. Return current from signal transmission lines can be used to explain and account for power plane bounce. Noisy power planes are known to be the root cause of many SI and EMI problems. The key to managing power plane bounce is in managing return currents and power plane decoupling. Larry D Smith received the BSEE degree from Rose Hulman Institute of Technology in 1975 and the MS dregree in Material Science from the University of Vermont in 1983. After joining IBM in 1978, he worked in the areas of reliability, characterization, failure analysis, power supply and analog curcuit design, packaging and signal integrity at Sun Microsystems since 1996. His current area of concentration is design of power distribution systems and reduction of simultaneous switch noise. SCV IEEE EMC Society Dinner Meeting Locations The dinner and meeting will be held at the Silicon Graphics Café Iris, Building 5, on 2025 Stierlin Court in Mountain View, CA. For additional information and directions visit our website: www.scvemc.org = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com To unsubscribe from si-list: send e-mail to majord...@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu
Re:Santa Clara Valley EMC Meeting Notice 11Jan2000
The meeting is open to everyone and is free of charge. Some food and drinks are offered for purchase prior to the meeting. visit our website for driving directions. www.scvemc.org = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Santa Clara Valley EMC Meeting Notice 11Jan2000
January 2000 Meeting Notice When/Where: Tuesday, January 11th, 2000. Silicon Graphics Café Iris, Building 5, 2025 Stierlin Court in Mountain View, CA. Time 7:30pm - 9:30pm. Topic/Speaker: EMI and the PCB Fundamental Concepts and Design Techniques -Mark Montrose Details: EMI and the PCB Fundamental Concepts and Design Techniques This presentation illustrates, in simplified form, how and why EMI gets developed within a printed circuit board (PCB) and the manner in which propagation occurs; radiated or conducted. Basic concepts are examined to remove the mystery on why problems are designed into a product, and how one can prevent making mistakes from happening time and time again. A major focus on this talk deals with the subject Maxwell Made Simple. There are many parasitics and concerns that exist in any product design. Failure to recognize these items dooms a product to potential failure. For example, a component is not a component, but must be incorporated using a virtual ground/return structure. In addition, we must solve the complex portion of the impedance equation using device parameters that are not published by component manufacturer. Also, we implement outdated rules-of-thumb based on illogical concepts and bad advise provided by those who use to design PCBs that incorporated vacuum tubes or slow speed TTL logic. Components now operate in the sub-picosecond range, which present new challenges and opportunities for design and compliance engineers. Regardless of whether one is an entry level or senior designer, fundamental concepts never change. It is interesting to see how much information we have forgotten over the course of many years. The last portion of the talk will illustrate several design techniques that can be immediately implemented that have a long track record of success. At the completion of the talk, an open forum session will occur where any question related to EMI and PCB can be asked. This forum will last until it is time to get kicked out of the facility. Biography Mark Montrose is principal consultant of Montrose Compliance Services, Inc. Mark is a Senior Member of the IEEE, and is a current member of the Board of Directors for the IEEE EMC Society. He holds membership in the dB Society and TC-8, Product Safety Technical Committee. He has presented numerous papers on PCBs and EMC at IEEE International EMC Symposiums and Colloquiums in North America, Europe and Asia. Mark has authored several text/reference books published by IEEE Press: Printed Circuit Board Design Techniques for EMC Compliance, 1996, EMC and the Printed Circuit Board - Design, Theory and Layout Made Simple, 1999, And a contibuting author to the Electronics Packaging Handbook, 1999 (CRC/IEEE Press). = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Y3K
speaking of garbled use of units, How many buy hardrives in bits? everyone I hear says bytes as in a 10 megabyte HD. They even abbreviate is as 10 MB when it should be called a 10 Megabit drive (10 Mb) with little b as big B is for Byte. = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
14 Dec. Meetings: 1) Bio. hazards 2) Safety use of EMI filters
The Santa Clara Chapter of IEEE's EMC Society is presenting two talks on: Tuesday, December 14th, 1999 at: Silicon Graphics Café Iris Building 5 2025 Stierlin Court Mountain View, CA. Time 7:00pm - 9:30pm. Topics/Speakers: Biological Hazards from RF Energy Thomas N. Cokenias and; Safety and the Use of EMI Filters Gary Liu Details: 1) - Biological Hazards from RF Energy - In recent weeks the media has aired stories warning cell phone users about possible links between cancer and exposure to RF and microwave energy, with countering stories that dismiss these studies as failing to show any such links. Whether or not cell phones use increases risk of contracting certain brain cancers is a matter of continuing debate and research, but it has been known since the beginning of radio science that exposure to high levels of RF can cause skin burns and tissue damage due to RF induced heating, the same way that microwave ovens elevate the temperature of food. This talk will be an overview of RF hazard testing and regulations, with some discussion of ANSI, FCC and OSHA regulations limiting RF exposure hazard, specific absorption rate (SAR), measurement equipment and techniques, and how local industries (such as semiconductor manufacturing equipment vendors and wireless system installers) are affected by the requirements of the regulatory agencies. THOMAS N. COKENIAS is an EMC consultant from the SF Bay area. He spent 8 years as an engineer with the Equipment Authorization Branch at the FCC Laboratory in Columbia MD, working mostly with Part 15 transmitters and other unlicensed RF devices. He served 12 years as VP engineering of Electro Service Corporation, an independent EMC test laboratory in Belmont,CA, and for the last 5 years has been an independent consultant with special interests in wireless device certifications , in situ EMC testing, and helping clients prepare for laboratory accreditations. Mr. Cokenias is a member of the Ultra Wideband Working Group and serves as an officer in the Santa Clara Valley IEEE EMC Society chapter. 2) - Safety and the Use of EMI Filters - GARY LIU has a BSEE from Cal State LA, 1990. Joined UL in June of 1990. Gary worked in Sec. G the entire time, worked on products including audio, video, and tv products, some transformers and motor operated appliances, some EMI filters and havily involved in TVSS (surge suppressors) and power strip in the last few years. = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Thousands of Stores. Millions of Products. All in one place. Yahoo! Shopping: http://shopping.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
hot-swap disc drives
Does anyone recall when the first hot-swap disk drive was used? I recall something in the early 80's for govt and industry by some company named phase-four? or something like that. = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
SCV IEEE Talk on SSO and EMI
For those of you that missed the presentation by Dr. Richard Wheeler and/or requested copies of his presentation on Simultaneous Switching Noise in the z-direction.. can view the paper on his website: www.wheeler.com = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Talk on Simultaneous Switching Currents, noise and EMI
The Santa Clara Valley Chapter of IEEE's EMC Society (www.scvemc.org) is presenting: Membership not required, all welcome When: Tuesday, November 9th, 1999. Where: Silicon Graphics Café Iris, Building 5, 2025 Stierlin Court in Mountain View, CA. Time 7:30pm - 9:30pm. Topic: Modeling Simultaneous Switching Currents in the Z-axis Direction of VLSI Packages and PCB's. These currents are the primary source of SSO and EMI noise. Speaker: Dr. Richard Wheeler Details: Dr. Wheeler will show the importance of modeling z-axis noise in VLSI packages, sockets and PCB's. This noise, also known as SSO noise, is a major contributor to high performance system failure during debug and bringup due to inadequate modeling or noise analysis during design, as well as a source for EMI. The talk will: 1. Show a theoretical basis for SSO models. 2. Include examples for SSO reduction in VLSI packages. 3. Discuss why thick PCB's are a major contributor of SSO noise. 4. Present a quantitative example using SPICE models to illustrate methodology. 5. Give practical suggestions to simplify models and shorten computer computation time. 6. Discuss Conclusions. 7. QA. BIOGRAPHY: Dr. Wheeler started his own consulting business, Wheeler Enterprises, in Nov. 1996, after managing RD departments at Hewlett Packard Laboratories and Fujitsu Computer Packaging Technologies. He played a key role in inventing a new type of interconnect between VLSI chips and PC boards. The new interconnect will allow computer CPUs to operate at clock frequencies well above 1000 MHz. He developed the tools to predict and measure the hardware performance and submitted thirteen patent disclosures relating to high speed interconnect. He is currently a consultant to mid and senior level management regarding CMOS design, signal integrity and VLSI packaging issues. He has over 26 years experience in industrial management, research, and hardware development including: -Employee 5 in startup company, managing RD activity. -Technology design of high speed super computers, mainframes and workstations. -Bipolar and CMOS circuit, process and equipment design. -High-speed networking: physical layer and OS interface. -Authored 14 patents and a technical paper. -Ph.D. in E.E. and Solid State Physics. He can be located at: http://www.wheeler.com = Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Average Measurements above 1 GHz
There is somewhere a HP app note on how to perform CISPR average measurements (by calculating the VBW vs frequency). It was written for the 8566/8568 analyzers Its about 15 yrs old but someone on this list should have it. I lost mine and I don't recall the exact title. What I do, is to use a VBW of 3Hz at 0 span. That seems to correlate with the 8546's built in average detector. Hans --- John Cronin croni...@hotmail.com wrote: Now that we can carry out measurements at 3m I have another question. How to perform average measurements above 1 GHz. Most analyzers do not appear to have a specific CISPR compliant average function. So how is the average measurement carried out? Use of the average detector could yield a few dB lower levels even for a narrowband emission. __ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
RE: Amplifier for measurements above 1GHz
TEC in Mountain View is now producing a 1-6 GHz pre-amp for EMC applications. SMA or N. Call John Fisher Jr. for details at 800-TEC-DOES === Best Regards Hans Mellberg EMC Consultant __ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: EN50082-1:1997 EN55024
--- Benoit Nadeau bnad...@matrox.com wrote: Bonjour de Montreal, In another life, I was working for a EMC Test lab and we always used the step by step procedure which was in the ESD Standard. We tested using this procedure for years and we did encounter some products who failed at low level ESD but had no problem at higher levels. We wondered what to conclude and had some hypothesis. 1) may be the current path was different at higher level or 2) Lower levels might have a slightly longer rise time which tends to produce more energy in the lower part of the frequency spectrum where the EUT was more sensible. Partly true. The risetime changes as the voltage increases. The risetime slows (dV/dt or dI/dt value gets reduced) down as you begin to go over 6-8kV. I also have seen products fail at 2-4 kV and pass at levels 8-10 kV. This ofcourse is on air discharge equipment where variability of the risetime is expected. Contact discharge equipment do not exhibit much risetime variability (at least not to a large degree) Hans T. Mellberg EMC/ESD Consultant member ANSI/IEEE C63.16 WG on ESD __ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Horn antennas, pre-amplifier, and return loss measurement
The most knowledgeable person on 40-200+ GHz is Mr. Chuck Oleson (408-778-0491) of OLM Inc. in Morgan Hill CA. I suggest you contact him for informed answers. === Best Regards Hans Mellberg EMC Consultant _ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: EMC Book Summary
Thank you Ron Pickard; I find the Reference to EMC Books compilation extremely usefull and I would like to seek your permission to publish it in our local chapter's monthly publication, Spectral Lines serving the SF Bay Area IEEE EMC community. Best Regards Hans Mellberg Treasurer, Vice-Chair(elect) Santa Clara Valley Chapter, IEEE EMC Society === Best Regards Hans Mellberg EMC Consultant _ Do You Yahoo!? Free instant messaging and more at http://messenger.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Precompliance Testing
Before you put a rooftop OATS, (assuming you are not located in Easter Island or the Caribean Islands!) you are going to deal with substantially higher ambient signals. It so happens that when you need a stronger signal, a common practice is to raise the antenna! I have battled those problems twice in my past and I would not reccomend rooftop OATS anymore. --- bogda...@pacbell.net wrote: May I add a note of caution: It may be worthwhile to check the permissible loading of the roof, especially when you are in the Southwest where roofs are mostly for shade and a few drops of rain. I guess that you don't want to appear suddenly in the conference room below Bogdan. Gary McInturff wrote: I'll agree with Brent, and others, the headaches of a metal room or the metal studs et al, in a building are going to make you pull your hair out. But there is an alternative to the parking lot. You may want to consider the roof. The ground reference can be put up there as well, especially if you are doing pre-compliance stuff. You don't have to give up parking space - which is sure to irate somebody. The roof gets a little hot, but that only gives you the opportunity to work in your cutoffs, and showing up to a meeting with the suits dressed like this is always good for a laugh! Gary snip === Best Regards Hans Mellberg EMC Consultant _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Harmonics
From what I remember in High School and College, Fo (actually it was omega-naught) was originally used to designate the resonant frequency of an LC network. I would then surmise that Fo, over the years, has been carried over to designate the primary frequency of oscillation. Fourier series and harmonic numbering have liberally used Fo as the fundamental frequency but, I have also seen technical texts with F1 as the fundamental especially when other hamonics are mentioned. As someone already stated, it is a matter of semantics and who wrote it. --- ed.pr...@cubic.com wrote: Robert and Scott: I agree that the fundamental is the First Harmonic. Now, to muddy things up some more, how does all this discussion square with calling the fundamental Fo? ;-) Ed snip === Best Regards Hans Mellberg EMC Consultant _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Harmonics
If you want to somewhat retain a square looking wave and non-sinusoidal, then you must keep the third harmonic. The first and third are essential. All subsequent odd harmonics can be filtered aggressively, i.e. w/ a multi-pole filter. The even harmonics add and subtract at the wrong places. You should not have the 2nd harmonic as it will distort the waveform substantially. Design your filter to begin just above the 3rd harmonic. --- ajm...@us.ibm.com wrote: Hi All, My understanding of the harmonics has been: first harmonic is fundamental times one, second harmonic is fundamental times two, third harmonic is fundamental times three, and so on. This is how I have seen it described in books also. I do not remember any recent book that provides this type of information. During our filter design class, we were normally asked to filter third harmonic properly, as this was generally most significant after the fundamental. In a square wave with 50% duty cycle, the even harmonics will generally be non-existent (2nd, 4th, etc.). Regards, Ravinder Email: ajm...@us.ibm.com *** Always do right. This will gratify some people and astonish the rest. Mark Twain s_doug...@ecrm.com (Scott Douglas) on 04/21/99 10:38:17 AM Please respond to s_doug...@ecrm.com (Scott Douglas) To: emc-p...@majordomo.ieee.org cc:(bcc: Ravinder Ajmani/San Jose/IBM) Subject: Harmonics Hi All, Recently an interesting discussion came up about harmonics. A general disagreement followed. We hope you all can offer some insight and perhaps help us settle the question. The question is numbering of harmonics. One side says that given a fundamental frequency of 200 MHz, the first harmonic is 400 MHz, the second harmonic is 600 MHz and the third harmonic is 800 MHz. The other side says that given a fundamental frequency of 200 MHz, the first harmonic is 200 MHz (or same as fundamental), the second harmonic is 400 MHz and the third harmonic is 600 MHz. The other part of the discussion revolved around even and odd harmonics. One side says that even harmonics are lower amplitude than the odd harmonics, the other side says odd harmonics are lower amplitude than even harmonics. All discussions assumed non-sinusoidal sources, generally our sources are square- or modified-square waves. === Best Regards Hans Mellberg EMC Consultant _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Country of origin
Country of Origin rules in the US are set by the department of commerce. They are enforced by the FCC and by US customs. Their origin dates back to the 60's when something called the Buy America act was passed by Congress. There are specific meanings and requirements to: 1)Made in USA, (must have a certain % content of US) 2)Assembled in USA (if the content is less than 1)and, 3)Manufactured using components from one or more of the following countries The exact details escape me at the time and you would have to consult with an import broker to get the current requirements and exact wording. Hans === Best Regards Hans Mellberg EMC Consultant _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: explanation of ESD events with coins in baggie.
---Lou Gnecco l...@tempest-inc.com wrote: Do you get the same effect with the coins in a cloth bag or a paper bag? Has anybody tried it? Lou To answer that, there are two parts; 1) Look at the triboelectric series chart. This chart, shows, what materials when rubbed with what other materials, will generate either a positive or negative charge and the relative magnitude of the charge. The materials at the top of the chart will generate a positive charge and the materials at the bottom of the chart will generate a negative charge. The farther apart the materials, the greater the charge build up. 2) Determine the conductivity of both materials. If one of the materials is a conductor, then assume that dishcharge can occur from any location. If it is an insulator, then a dicharge can only occur from the localized charged area. If one of the materials is a conductor and the second material is poor conductor such as paper or cloth, then the charge will begin decaying as soon as it is built up with a time constant based on the conductivity of the poor conductor. So, to answer your question, paper or cloth bags will have a lesser effect than a polymer bag. In certain conditions, the charge may not even built up enough to create any effects. Hans Mellberg _ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: explanation of ESD events with coins in baggie.
There is an expanation for this seemingly unlikely event. Having coins in a baggie and jingeling them causes the following events to occur: The rubbing of a coin against the polymer causes triboelectric charging of both the coin and localized areas of the bag. Since there are multiple coins, each coin will charge at some voltage level but not necessarily the same as another coin. When two coins of different charged voltages come within dielectric breakdown distances, a discharge will occur from one coin to the other in order to equalize the charge distribution (q1=C1V1 and q2=C2V2. When they touch, the new q1 will be C1V3 and q2= C2V3 where V3=(q1+q2)/(C1+C2)). Since coins are electrically small with very small capacitances, the expected discharge waveform has a very fast risetime hence the radiation at the GHz region. There will also be discharges from the localized charged areas of the polymer to coins of different voltages. While separating two charged surfaces from each other, the voltage rises significantly since the capacitance is being reduced and the conservation of charge must be preserved which is the basis for tribolectric voltage generation. Hope that helps Hans Mellberg ---b...@namg.us.anritsu.com wrote: Hi Douglas, What you described is very interesting! But I cannot understand Jingling change in a ziplock bag produces very high levels of super fast transients up into the GHz range. It seems to me that jingling coins, jangling keys, and slamming metal door would certainly produce acoustic waves. How come they also produced electromagnetic waves? If do, under what conditions? What is the mechanism to produce very high level of transient EM waves? Did that company incorporate those kinds of Jingling change in a ziplock bag tests into regular ESD tests for their thereafter products? What is the lessen we all should learn from this particular example? Hopefully you don't think it's offensive to ask above questions. I am just very curious. Thank you. Best Regards, Barry Ma (408)778-2000 x 4465 - Original Text From: Douglas McKean dmck...@corp.auspex.com, on 3/10/99 2:55 PM: At 08:03 AM 3/8/99 PST, Bailin Ma wrote: Hi Group, We have already seen awards for the most misleading ads, worst attire, worst films, . Why not awards for worst EMC and PS qualities? Barry Ma Morgan Hill, CA 95037 Long ago in another company, I was completing the testing for a large rack mounted device, i.e. emissions, immunity, safety, some parts of Bellcore. We got a call from one of our customers complaining about how sensitive our equipment was and how susceptible it was to ESD events during their own testing of our equipment. This was deemed unacceptable by them. This decision of theirs jeopardized a sale of several million dollars. The finger was duly pointed by everyone right to yours truly. My head was literally in no uncertain terms put on the block. I contested producing repeatable and acceptable ESD test results that were BELOW the BER levels specified by Bellcore with ESD test levels ABOVE that specified by the test standard. I wanted as much margin as possible for our product. Well, it ended up that if you stood three to four feet in front of the rack and jingled change in your pocket or jangled a set of keys in front of it, the product would RESET. Jingling change in a ziplock bag produces very high levels of super fast transients up into the GHz range. Worse, slamming the metal door to the lab in which the equipment was setup would also reset the product. The lab door was say 20 or so feet from our equipment under test. It took six months of a redesign cycle to straighten out that one, but it was finally done. I always wanted to find out who in God's name could have come up with such an insidious ESD test by simply putting some change in a zip lock bag and jingling it in front of equipment. But, I figured he, whoever he was, was lost in time. And wouldn't you know it? ... I now work for that man. - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). _ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com - This message is coming from
Re: Awards for Worst EMC/PS qualities
A certain German sports car using a certain German fuel injection system could be made to malfunction in an amuzing way (not to the sports car operator though!) such as backfire, sputter, smoke, flames from exhaust pipe, etc., by tractor-trailer operators with their CB lin-amps when keying on and off. This was a popular thing to do by truckers in the late 70's. This susceptibility problem was addressed and corrected by the sports car manufacturer. Other manufacturers may have had similar problems. At 08:03 AM 3/8/99 PST, bma (Bailin Ma) wrote: Hi Group, We have already seen awards for the most misleading ads, worst attire, worst films, . Why not awards for worst EMC and PS qualities? Barry Ma Morgan Hill, CA 95037 - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). _ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
Re: Digital Set-top Box is not Broadcast receivers?
The settop CATV and cable-modem I worked on a couple of years ago both had tuners. Our client in Europe insisted on the EN50013 and ..20 as they clearly met the requirements. That was two years ago. Hans ---Tommy le...@khgw.info.samsung.co.kr wrote: Hellow Group. I confuse the standard of Digital Set-Top Box LUCCE-2000 whether it is ITE. It is called 'Set-Top Box' usually.But It has differnt things compare with Set-Top Box. It has two major product family standards. First,About ITE function - Ethernet Port ; High speed Internet output to a PC. At this time it operate like as Modem. - LINE Input Port ; Receive MPEG encording Data from Digital casting Company.- memory(36M) function It decording the received data and then display.- processing Second,About Broadcast receivers function - RF IN Jacks ; For additonal signal input:TV antenna,cable company etc. - RCA AUDIOVIDEO Jacks ; Output for compatible VCR and/or TV equipped with input jacks. Though it should be tested comply with EN55013 and EN55020,there are some unfit point. - It doesn't have Tuner.Antenna Jack is only bypass to RF Out jack. This jack must be connectd to a cable source if the user wish to watch one program through the TV tuner while recording another through the ITV Box tuner. What Standards are it be applied? I think that is ITE. Would be happy to help. Best regards. Tommy. - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators). _ DO YOU YAHOO!? Get your free @yahoo.com address at http://mail.yahoo.com - This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: unsubscribe emc-pstc (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
