RE: US Modem Safety
This is a multi-part message in MIME format. I am not sure about your agency review, but I have always used the Telcom rated fuses from Raychem (TR600-150)and there has never been a problem. This is based on UL 60950 anex B testing via the flow chart on page 200 and 201. I believe that refers to compliant PSTN fuse protection devices. Please keep in mind that the EU and UL versions of 60950 are slightly different. Daniel J. Pierce Sr. Hardware Engineer Escient Division Digital Networks of North America, Inc. Suite 200 6325 Digital Way Indianapolis, IN 46278 Direct Phone and Fax: (317) 616-6587 Email: dpie...@escient.com From: Alex McNeil [mailto:alex.mcn...@ingenicofortronic.com] Sent: Monday, December 01, 2003 6:00 AM To: emc-p...@majordomo.ieee.org Subject: US Modem Safety Hi Colleagues, I intend to use an overcurrent protection device, the Raychem polyswitch TS250-130, on an analogue modem interface for Europe and the US. I know this should be OK for Europe but is the 250V rating (ITU lightning protection to 1.5KV) OK for the US? Kind Regards Alex McNeil Principal Engineer This email has been scanned for all known viruses and appropriate content by the Messagelabs mail service. This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ 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: emc_p...@symbol.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://www.ieeecommunities.org/emc-pstc Title: RE: US Modem Safety I am not sure about your agency review, but I have always used the Telcom rated fuses from Raychem (TR600-150)and there has never been a problem. This is based on UL 60950 anex B testing via the flow chart on page 200 and 201. I believe that refers to compliant PSTN fuse protection devices. Please keep in mind that the EU and UL versions of 60950 are slightly different. Daniel J. Pierce Sr. Hardware Engineer Escient Division Digital Networks of North America, Inc. Suite 200 6325 Digital Way Indianapolis, IN 46278 Direct Phone and Fax: (317) 616-6587 Email: dpie...@escient.com -Original Message- From: Alex McNeil [mailto:alex.mcn...@ingenicofortronic.com] Sent: Monday, December 01, 2003 6:00 AM To: emc-p...@majordomo.ieee.org Subject: US Modem Safety Hi Colleagues, I intend to use an overcurrent protection device, the Raychem polyswitch TS250-130, on an analogue modem interface for Europe and the US. I know this should be OK for Europe but is the 250V rating (ITU lightning protection to 1.5KV) OK for the US? Kind Regards Alex McNeil Principal Engineer This email has been scanned for all known viruses and appropriate content by the Messagelabs mail service. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ 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: emc_p...@symbol.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://www.ieeecommunities.org/emc-pstc <>
When is FCC DOC required?
Dear Group I have a DVD player that has a hard disk drive, and Ethernet connection. When is a declaration of conformance required? Only if I apply the FCC logo? Would I need to be -3db from the limit or below the margin of error of the test equipment? What are the options I have besides self verification and the requirements / logos. Thank you in advance for all information. -Dan Pierce 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
AV terminations
Dear Group, I was wondering what the typical load termination to use for audio and video RCA connections on a typical receiver, both in and out. --- 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"
ITE / AV Equipment with Ethernet
Dear Group, I currently have a device that is a cross between ITE and AV (a typical set top box) which has Ethernet. I am wondering how to terminate the line for testing both emissions and immunity. In addition, should I have this Ethernet setting so that I transmit data in a 1 meter loop back cable? Would a connection to a hub with no other lines to/from be legal? Any responses are greatly appreciated. Sincerely, -Dan Pierce --- 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"
Conducted Line Emissions
Greetings: I am looking for proof that I can use the averaged value for emissions rather than the peak value. Attached is a chart that I was given by an Asia test site that told me I failed. According to my past experience, I believe that the average power is what I should be concerned about. Similar to radiated emissions right? Thank you. Daniel J. Pierce Sr. Design Engineer OpenGlobe, Inc. > (An Escient Technologies Affiliate) 6325 Digital Way Indianapolis, IN 46278 mailto:dpie...@openglobe.net P: (317) 616.6587 F: (317) 616.6587 <> Pages from Line conduction.pdf Description: Binary data
EMI on ATAPI interface (HDD + DVD)
Dear Colleagues, I would like to know if anyone has experience in quieting an IDE interface and if there are any good design guides. Here is the scenario: I have a system that has a HDD and DVD on the IDE interface. My system clock runs at 54MHz and I am having problems in the 120-125MHz range (+3dB over). I can suppress these frequencies by using a ferrite on the ribbon cable by this is not an acceptable design. I need to go into another layout spin with a solution to get at least 6dB attenuation. Radiation seems to be coming from the point at which it leaves the motherboard. I am going to go into the dirt to fix this, but I would like to know if anyone has seen this before. Does anyone know of good termination schemes for IDE or best place to put beads. Anything is greatly appreciated. Sincerely, Daniel J. Pierce Sr. Design Engineer OpenGlobe, Inc. > (An Escient Technologies Affiliate) 6325 Digital Way Indianapolis, IN 46278 mailto:dpie...@openglobe.net P: (317) 616.6587 F: (317) 616.6587 <>
RE: Ferrites for GND
Should I be using 10 Ohm here? -Original Message- From: Wan Juang Foo [mailto:f...@np.edu.sg] Sent: Friday, October 11, 2002 8:29 PM To: Dan Pierce; emc-p...@majordomo.ieee.org Subject: Re: Ferrites for GND Dan, It is a lossy material and most commercially available ferrite beads are 'tuned' to peak around the 100 MHz (VHF band II ?). I suppose there must be lots of exception but I have not use any outside this region. Most of them have different Q to describe their individual characteristics. Obviously, there are lots of RFI from many FM radio stations making it a necessity for many design. The material's 'lossy' property are subjected to saturation etc... Here is how I suppose it works :-) or fail to work often..., the presence of a ferrite bead in the ground path increases the inductance of the return path at some frequencies, it also introduces a form of RF losses that can be modelled as an ac resistance. Hence, it is a differential mode filter of sorts, it will not work against CM interference if the bead is only in the path of the return lead (signal ground). There is always other grounds that RF breakthrough can come around. However, so much being said, pay careful attention to the layout (installation and placement) because in general reference designs often do not provide reference 'photographs' for best layout practices. Some do provide PCB layout but very often in the interest to avoid verbosity, the all important 'notes' are absent. Inter-conductor capacitance can ruin the performance of the ferrite bead. Just my 2 ¢ cheerio... Tim Foo Dan Pierce cc: (bcc: Wan Juang Foo/ece/staff/npnet) Sent by: Subject: Ferrites for GND owner-emc-pstc@majordo mo.ieee.org 10/12/02 03:01 AM Please respond to Dan Pierce I have always been reluctant to place ferrite beads in the ground path, but I see them frequently in reference designs for USB and Analog Audio. What kind material should this be and what characteristics would this type of ferrite have. I am assuming this ferrite would not have 600 Ohm impedance @ 100MHz Thanks in advance, Daniel J. Pierce Sr. Design Engineer OpenGlobe, Inc. > (An Escient Technologies Affiliate) 6325 Digital Way Indianapolis, IN 46278 mailto:dpie...@openglobe.net P: (317) 616.6587 F: (317) 616.6587 (See attached file: Dan Pierce.vcf) --- 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"
Ferrites for GND
I have always been reluctant to place ferrite beads in the ground path, but I see them frequently in reference designs for USB and Analog Audio. What kind material should this be and what characteristics would this type of ferrite have. I am assuming this ferrite would not have 600 Ohm impedance @ 100MHz Thanks in advance, Daniel J. Pierce Sr. Design Engineer OpenGlobe, Inc. > (An Escient Technologies Affiliate) 6325 Digital Way Indianapolis, IN 46278 mailto:dpie...@openglobe.net P: (317) 616.6587 F: (317) 616.6587 <>
Looking for good USB EMI suppression techniques
Greetings: I am looking for a good design practice regarding USB transmission lines. I commonly have problems with 120.00MHz and 252.00MHz. Thanks in advance. Daniel J. Pierce Sr. Design Engineer OpenGlobe, Inc. > (An Escient Technologies Affiliate) 6325 Digital Way Indianapolis, IN 46278 mailto:dpie...@openglobe.net P: (317) 616.6587 F: (317) 616.6587 <>
RE: Requirements for Device Connected to Phone Line
A bunch of FCC Part68 tests, and registration of product. If you integrate a module that is already approved you can avoid all the testing but I think you still have to register. Canada is just paperwork submission of FCC results and more fees. For fee information see the Administrative Council for Terminal Attachment (ACTA)http://www.part68.org this site provides useful information regarding what is required. Daniel J. Pierce Sr. Design Engineer OpenGlobe, Inc. > (An Escient Technologies Affiliate) 6325 Digital Way Indianapolis, IN 46278 mailto:dpie...@openglobe.net P: (317) 616.6587 F: (317) 616.6587 -Original Message- From: don_macart...@selinc.com [mailto:don_macart...@selinc.com] Sent: Monday, July 22, 2002 9:07 AM To: emc-p...@majordomo.ieee.org Subject: Requirements for Device Connected to Phone Line Hello Group, What are the requirements for devices which connect to the public phone line of the U.S. and Canada? Regards, Don -- This e-mail may contain SEL confidential information. The opinions expressed are not necessarily those of SEL. Any unauthorized disclosure, distribution or other use is prohibited. If you received this e-mail in error, please notify the sender, permanently delete it, and destroy any printout. Thank you. --- 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" <>
Hot Chassis?
I currently have a 110/220 power supply that has several 2200UF capacitors tied to FGND two of which are tied to the AC lines in. This supply comes with a three prong NA cord set. I have found that if I bypass the earth ground plug I can measure a 80 VAC potential from my chassis to earth ground. I found this out in the lab when someone touched the chassis and a grounded bench and got zapped. Is there guidelines regarding this? I see the UL mark on this power supply. I want to use a two prong NA cord set not a three prong NA cord set and I have been told OK by the manufacturer. I have been told that the FGND current is approx. 100uA, but I have not verified yet. How can this be safe? Dan Pierce Indianapolis, IN 46112 317.616.6587 Direct phone and fax --- 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,"
CE or CB ?
I am in the process of introducing product into the EU and possibly world wide. I was shown that the CB mark testing covers all the countries in the EU that we plan to sell to and other countries as well. Is this a new mark? Would I be better off getting the CE mark and then test to other countries applicable standards or the CB mark? The test facility that provided me with the information was Intertek Testing Services, in California USA. I planned to test to: EN55013 EN55020 TBR21 61000-3-2 61000-3-3 Daniel J. Pierce Sr. Design Engineer OpenGlobe, Inc. > (An Escient Technologies Affiliate) 6325 Digital Way Indianapolis, IN 46278 mailto:dpie...@openglobe.net P: (317) 616.6587 F: (317) 616.6587 --- 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,"
