RE: Pencil erasers for pre-EMI cleaning?
David, Forget the pencil eraser. This is the same deal as using one to clean battery contacts. Works great - for a short time. Look on the web for Caig Laboratories, Inc. they make a series of chemicals that are meant to deoxidize metal contacts. I've used their "DeoxIT D5" for years. I call it "gremlin spray" because it gets rid of pesky intermittent connections. Scott Lacey -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of David Heald Sent: Thursday, February 28, 2002 2:44 PM To: emc-p...@majordomo.ieee.org Subject: Pencil erasers for pre-EMI cleaning? All, I'm preparing for an emissions test and I had started cleaning some of my chassis mating surfaces with a pen/pencil eraser then alcohol to ensure the surface to surface contact was good. A friend then told me that using an eraser would also remove the anti-corrosive coating that was on the metal (Thanks Paul!). So I would end up with a very short term benefit, then rust. What I am trying to determine is if maybe light rubbing with a pencil eraser might only remove surface contaminants and leave the metal and coatings intact. (the pencil eraser is much less abrasive than the pen side) So the real question is... Does anyone have direct good or bad experience with the aftereffects of using a pencil eraser to clean mating edges (card faceplates in a telco box for example)? I have both steel and aluminum surfaces to worry about so info for either type is welcome. (and don't worry the different metal types are not adjacent). Any feedback would be greatly appreciated as the system is really dirty right now. Thanks and Best Regards, Dave Heald --- 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"
Jate Blue Book
Hello to all, I have heard that the JATE Blue Book:2000 (in English) is freely available for download. Is it actually available for free download? And if anyone knows about this, then please share the web address to do this. Actually, I have been at JATE's website, "http://www.jate.or.jp/index-e.html";, and found the "Ordinance Concerning Terminal Facilities, etc." in multple parts. Is this the Blue Book or something else? It would be most appreciated to get a free download of the Blue Book in English (if its available). Please advise. Best regards, Ron Pickard rpick...@hypercom.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: Safety Margins based on NSA premises
A 10 dB margin? That's easy for the guy doing the test to say! Heck; why not 20dB?! For the designer who is sweating bullets trying to keep within cost and size requirements, however, this may be quite another matter. Considering the original specifications are somewhat arbitrarily derived in the first place, it seems to me a more pragmatic approach is warranted that meets the spirit of the regulations, rather than just overdesigning to meet ill-defined "worse case" scenarios that may or may not actually exist. Bob Wilson TIR Systems Ltd. Vancouver. -Original Message- From: Greilich, Jeff [mailto:jeff.greil...@asl-tk.com] Sent: February 28, 2002 10:00 AM To: emc-p...@majordomo.ieee.org Subject: Safety Margins based on NSA premises Et Al: Another important point to consider on safety margins is how the site performed for Normalized Site Attenuation (NSA) when applicable. A +/-4dB variation is the maximum allowable for NSA based on the premise that 1.5 dB is attributable to the site uncertainty and 2.5 dB is attributable to instrumentation uncertainty. Considering these uncertainties, if a mere 3 dB of margin is considered as "safe", it is conceivable that the same EUT could be measured 8 dB different at another site (i.e. the FCC's Site). However, if a 10 dB margin is achievable, this automatically factors out site conjugate uncertainties and provides an additional 2 dB margin for a worst-case scenario. Regards, Jeffrey W. Greilich EMC Technical Manager Automotive System Laboratory, Inc. 27200 Haggerty Road, Suite B-12 Farmington Hills, MI 48331 (248) 848-2771 (Office) --- 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"
RE: CCFL light output
I think I understand what he is asking - He has a chart of (CCFL) tubes with specified length and diameter and Lumens output for that specific tube length and diameter. What he wants is the relationship between the light output in Lumens and the necessary input power in Watts. I would go back to the manufacturer for that information. John Shinn, P.E. -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of John Woodgate Sent: Wednesday, February 27, 2002 11:07 PM To: emc-p...@majordomo.ieee.org Subject: Re: CCFL light output I read in !emc-pstc that Wani, Vijay (V) wrote (in ) about 'CCFL light output', on Wed, 27 Feb 2002: > I am trying to build a thermal model a cold cathode fluorescent lamp (CCFL) >for cooling analysis. CCFL manufacturer showing a chart of light output in >Lumens as a function of lamp length and diameter. I need to convert lumens >to watts for input into Icepak. I would appreciate any help you can provide. Your question may have been misunderstood. Are you looking for the thermal power produced by absorption of the light by surrounding components? Or the power input to the lamp required to produce a light output of a given number of lumens? -- 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"
RE: SV: Screened Room Ambient Scans
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 ) 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"
Re: ESD Generator confidence test (humor)
I read in !emc-pstc that Chris Chileshe wrote (in <01c1c055.2b424100.chris.chile...@ultronics.co.uk>) about 'ESD Generator confidence test (humor)', on Thu, 28 Feb 2002: >Can we extend this principal to confidence tests on surge equipment >using middle management and members of the sales departments? No, because they fall to the floor, wet their pants and quiver if their coffee is late or their expenses are queried, so the test result is unreliable. -- 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"
job posting
Dear colleagues, Hope a job posting for a compliance engineer position will not do too much harm to the scope of this group. For those close to or willing to move to Montreal, Canada, please see the summary below. Alexandru Guidea CAE Inc. Montreal, Canada Here is a summary of the required qualifications: Bachelor Degree in Electrical/Electronics Engineering. Background or strong experience in electronics - analog and digital design. Background in electromagnetism or experience in RF design. Background or strong experience in power electronics and electrical engineering. Knowledge of commercial and military EMC and Safety standards. Experience in CE marking of ITE. Experience in CAD and office SW tools. Familiar with test and measurement instrumentation. Experience in the aerospace industry. Previous exposure to packaging of electrical and electronic assemblies. For additional info and position profile, please contact directly Sophie Boulet at sbou...@cae.com for job ref. TE6065. --- 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: Pencil erasers for pre-EMI cleaning?
I'm sure there are products on the market just for this purpose. But I would be concerned about my design if pass/fail depended upon how clean the mating surfaces are. A component substitution or some other ECO to the product down the line could put the product over the limit. Refer to the thread on test margins. John Juhasz Fiber Options Bohemia, NY -Original Message- From: David Heald [mailto:davehe...@mediaone.net] Sent: Thursday, February 28, 2002 2:44 PM To: emc-p...@majordomo.ieee.org Subject: Pencil erasers for pre-EMI cleaning? All, I'm preparing for an emissions test and I had started cleaning some of my chassis mating surfaces with a pen/pencil eraser then alcohol to ensure the surface to surface contact was good. A friend then told me that using an eraser would also remove the anti-corrosive coating that was on the metal (Thanks Paul!). So I would end up with a very short term benefit, then rust. What I am trying to determine is if maybe light rubbing with a pencil eraser might only remove surface contaminants and leave the metal and coatings intact. (the pencil eraser is much less abrasive than the pen side) So the real question is... Does anyone have direct good or bad experience with the aftereffects of using a pencil eraser to clean mating edges (card faceplates in a telco box for example)? I have both steel and aluminum surfaces to worry about so info for either type is welcome. (and don't worry the different metal types are not adjacent). Any feedback would be greatly appreciated as the system is really dirty right now. Thanks and Best Regards, Dave Heald --- 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"
Re: Pencil erasers for pre-EMI cleaning?
David Heald wrote: >> I'm preparing for an emissions test and I had started cleaning some of my chassis mating surfaces with a pen/pencil eraser then alcohol to ensure the surface to surface contact was good. << David, This is an ever present help in time of trouble. Don't do it. (grin) Cleaning mating surfaces will help pass a test. But it is a bad idea. The purpose of a test is to catch what fails. If there's a nonconductive film preventing contact -- and this is common! -- then you need to change the process that put it there. Or find another way to make contact in that location. You want your PRODUCTS to pass, not just your test samples. It is a great troubleshooting, tool, however. I favor a paper towel with alcohol; the silicates in the paper are rough enough, usually, and the alcohol will dissolve some of the grease. Cortland --- 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: Pencil erasers for pre-EMI cleaning?
I'm not trying to be antagonistic, but unless you plan to perform this procedure on all production devices - neither should you do so to the test sample(s). My 2 cents worth. Regards, Stephen At 02:43 PM 2/28/2002, you wrote: All, I'm preparing for an emissions test and I had started cleaning some of my chassis mating surfaces with a pen/pencil eraser then alcohol to ensure the surface to surface contact was good. A friend then told me that using an eraser would also remove the anti-corrosive coating that was on the metal (Thanks Paul!). So I would end up with a very short term benefit, then rust. What I am trying to determine is if maybe light rubbing with a pencil eraser might only remove surface contaminants and leave the metal and coatings intact. (the pencil eraser is much less abrasive than the pen side) So the real question is... Does anyone have direct good or bad experience with the aftereffects of using a pencil eraser to clean mating edges (card faceplates in a telco box for example)? I have both steel and aluminum surfaces to worry about so info for either type is welcome. (and don't worry the different metal types are not adjacent). Any feedback would be greatly appreciated as the system is really dirty right now.
Pencil erasers for pre-EMI cleaning?
All, I'm preparing for an emissions test and I had started cleaning some of my chassis mating surfaces with a pen/pencil eraser then alcohol to ensure the surface to surface contact was good. A friend then told me that using an eraser would also remove the anti-corrosive coating that was on the metal (Thanks Paul!). So I would end up with a very short term benefit, then rust. What I am trying to determine is if maybe light rubbing with a pencil eraser might only remove surface contaminants and leave the metal and coatings intact. (the pencil eraser is much less abrasive than the pen side) So the real question is... Does anyone have direct good or bad experience with the aftereffects of using a pencil eraser to clean mating edges (card faceplates in a telco box for example)? I have both steel and aluminum surfaces to worry about so info for either type is welcome. (and don't worry the different metal types are not adjacent). Any feedback would be greatly appreciated as the system is really dirty right now. Thanks and Best Regards, Dave Heald --- 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: EMC Emissions Safety Margins
Russell, The margin issue is usually a much discussed subject when it comes to initial product EMC emission certification. As most experienced EMC engineers know that variances in production units will occur. Also to ensure that if a production unit is tested in a different 'accredited lab' a product margin to account for the lab site attenuation differences and measurement uncertainty is also required. Additionally when a product has little or no margin at initial certification, the product when going through EMC audits will almost certainly require 'tweaking' to 'pass the limit' and for any component/product design changes they will also affect the emission profile. [A real 'headache!!] Some companies operate a mandated margin (below the limit) of 4dB or greater at initial product certification and the sub-sequent production EMC audits usually 'pass' without any troubles. Other companies that do not have the 'margin' usually have an on-going struggle to get through EMC audits with a 'pass' below the limits. A suitable margin to aim for may depend on various factors e.g. expected production volume, number of product features offered, likely hood of product enhancements/developments to the electronics, market areas product is to be sold etc. The greater the 'margin' at the initial product certification will generally help during production audits and future product enhancements. Andy White Senior EMC Engineer Ericsson Wireless Communications Inc. San Diego CA -Original Message- From: Russell [mailto:r@totalise.co.uk] Sent: Wednesday, February 27, 2002 1:41 AM To: emc-pstc Subject: EMC Emissions Safety Margins What safety margin below the statutory limits for emc emissions should one aim to achieve to ensure all product samples are likely to pass when a single, peraps two, samples only have been tested. Are there any hard and fast rules? Is being just below the limits considered good enough? Thanks in anticipation for your views and advice. Russell. --- 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: Screened Room Ambient Scans
Russell (r@totalise.co.uk) wrote: >> I'm looking at an ambient scan starting at 32dBuV/m @ 30MHz, dropping to 18dBuV/m @ 70MHz then gradually (with small peaks and troughs) rising to 41dBuV/m @ 1GHz. << Russell, Are you sure these are room ambients? They might be the analyzer noise floor. Generally, a decent room will not admit signals high enough to be seen above the instrument noise floor. Even a poorly built one should attenuate 60 dB or better and only show a few, discrete ambients from nearby, high-power sources. Cortland --- 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
I read in !emc-pstc that h.knud...@niros.com wrote (in ) 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"
Re: CCFL light output
I read in !emc-pstc that Wani, Vijay (V) wrote (in ) about 'CCFL light output', on Wed, 27 Feb 2002: > I am trying to build a thermal model a cold cathode fluorescent lamp (CCFL) >for cooling analysis. CCFL manufacturer showing a chart of light output in >Lumens as a function of lamp length and diameter. I need to convert lumens >to watts for input into Icepak. I would appreciate any help you can provide. Your question may have been misunderstood. Are you looking for the thermal power produced by absorption of the light by surrounding components? Or t
Safety Margins based on NSA premises
Et Al: Another important point to consider on safety margins is how the site performed for Normalized Site Attenuation (NSA) when applicable. A +/-4dB variation is the maximum allowable for NSA based on the premise that 1.5 dB is attributable to the site uncertainty and 2.5 dB is attributable to instrumentation uncertainty. Considering these uncertainties, if a mere 3 dB of margin is considered as "safe", it is conceivable that the same EUT could be measured 8 dB different at another site (i.e. the FCC's Site). However, if a 10 dB margin is achievable, this automatically factors out site conjugate uncertainties and provides an additional 2 dB margin for a worst-case scenario. Regards, Jeffrey W. Greilich EMC Technical Manager Automotive System Laboratory, Inc. 27200 Haggerty Road, Suite B-12 Farmington Hills, MI 48331 (248) 848-2771 (Office) --- 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"
1000baseT Hubs
Greetings All, I am interested in finding out if any of the group has tested or is testing using 1000baseT hubs as part of their setups and found any that are relatively quiet from an RF emissions perspective. Thanks in advance. Ron Ron Longmoor EMC Test Engineer Motorola Computer Group Phone: 602 438-3430 FAX: 602 438-3644 Email: ron_longm...@eng.mcd.mot.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"
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RE: ESD Generator confidence test (humor)
One other life lesson one I learned about ESD test areas. One should always check that the drain wire is actually in place before on stands on the ground plane and zaps the heck out of some equipment at 20 K or so. I was trying to leave burn marks in the plastic housing to show me where the arcs were actually penetrating the device. After a few smacks with the gun. The whole ground plane was now elevated and when I leaned forward the table height coincided with a very important, (at least to me) and well known anatomical point so I got to be the ground path. I used much different words, and volume levels that those of your technician and I don't recommend the sensation to anyone. Gary -Original Message- From: Chris Maxwell [mailto:chris.maxw...@nettest.com] Sent: Thursday, February 28, 2002 7:05 AM To: Chris Chileshe; emc-pstc Cc: brian_ku...@leco.com Subject: RE: ESD Generator confidence test (humor) This brings up a good real life story. I used to work with a technician (John) who helped with our in-house compliance testing. One day, we were discussing the Horizontal Coupling Plane (HCP) which has a 1MegaOhm drain wire to the Ground Reference Plane (GRP). His theory was that he could stand on the GRP and touch the HCP during a discharge; and he wouldn't feel anything because of the drain wire. I argued that the 1MegaOhm resistance was much higher than his body resistance to ground; so he would get a very noticable "zap". Our theoretical arguments went nowhere. We decided to experiment. I have alot of respect for John; because he beleived strongly enough that he volunteered to be the guinea pig. I set the ESD gun for 4KV and hit the HCP. John's hands jumped from the HCP and he said something like "oooh" or "ouch" (I can't remember exactly). So, let that be a lesson to you guys out there. John already suffered so that others may learn :-) Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | > -Original Message- > From: Chris Chileshe [SMTP:chris.chile...@ultronics.co.uk] > Sent: Thursday, February 28, 2002 7:41 AM > To: 'emc-pstc' > Cc: 'brian_ku...@leco.com' > Subject: RE: ESD Generator confidence test (humor) > > > > Brian proposes a confidence test on ESD guns using colleagues.. > > >> If the ESD gun is working properly, they will fall to the floor > quivering > >> slightly. Then they will wet their pants and forget who they are > for > >> about 25 to 30 minutes. > > A number of questions arise Brian.. > > Is the order of events an essential part of the confidence test i.e. > if they > wet their pants *before* they fall to the floor, will the gun be > deemed to > have failed the test? > > Is there any useful information to be gained from the slight quiver, > i.e. > frequency, amplitude etc which might help with calibration of the > discharge > tip? > > Should the stop-watch be calibrated or would any wrist watch do, > including the lab assistant's own? > > Has any such confidence test resulted in immediate vacancies in the > engineering department, specifically, for a lab assistant. > > Can we extend this principal to confidence tests on surge equipment > using middle management and members of the sales departments? > > Rgds > > - Chris > > -Original Message- > From: brian_ku...@leco.com [SMTP:brian_ku...@leco.com] > Sent: Tuesday, February 26, 2002 3:17 PM > To: emc-p...@majordomo.ieee.org > Subject: Re:RE: ESD Generator confidence test > > > We also have come up with a simple way to test our ESD gun, but it > requires the > help from our lab assistant (lab managers work good too). > > First, have them take off their shoes and socks and stand on the > Ground > Reference Plan. Have them wet their fingers and grab the end of the > ESD gun. Crank up the gun to 16.5KV single shot and let them have it. > > If the ESD gun is working properly, they will fall to the floor > quivering > slightly. Then they will wet their pants and forget who they are for > about 25 to > 30 minutes. > > Keep in mind that this method is not yet approved by A2LA or NAVLAP. > > Have fun, > Brian > > --- > 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-ps
RE: ESD Generator confidence test (humor)
One indicator is actually present BEFORE applying this test; the extension of the subject's middle finger in the tester's direction! Cortland --- 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: Bellcore LATA
In a message dated 2/28/2002, Alex McNeil writes: > I am not too familiar with the North American requrements: > Our customer has requested Surge Protection testing to the Bellcore LATA > Switching General Requirements. 600 Vpk metallic, and 2500 Vpk > longitudinal. > > 1. Are you familiar with this spec? > 2. Are these requirements covered in any of the Regulatory Telecomms or > Safety specs or is our Customer wanting something beyond the regulatory > requirements? > 3. How can I get a copy of this standard? > Hi Alex: These requirements are described in Telcordia (formerly Bellcore) document GR-1089 CORE, "Electromagnetic Compatibility and Electrical Safety - Generic Criteria for Network Telecommunications Equipment." It can be purchased from the Telcordia web site at http://www.telcordia.com/. GR-1089 is not a regulatory requirement. It is simply an industry specification that can be called out on a customer specification. In the USA, compliance with GR-1089 is typically required by the major network operators for equipment that will be used in their central offices. Anyone else can also call out GR-1089 on a purchase specification if they choose to do so. In general, the lightning requirements in GR-1089 are more severe than those ITU K.20 or EN 300 386. Even more significant is the difference in power cross tests, which are much more severe in GR-1089 than the tests called out in K.20 or EN 300 386. While compliance with GR-1089 can be challenging and may add slightly to the cost of your interface circuits, it does provide a reasonable guarantee that the equipment will have very few field failures due to lightning and power induction. This makes it an attractive specification for customers to call out on a purchase specification. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. 781-721-2848 http://www.randolph-telecom.com
RE: EMC Emissions Safety Margins
There are two factors to take into account when determining the minimum margin for compliance with an EMC emissions limit. The first is the level of uncertainty of the measurement. This number should be in your test report from your lab. If not, ask for that number. This is the amount that the particular EUT needs to be below the limit in order to guarentee that it will pass. (If the lab does not have the number, or cannot produce it, find another lab fast.) The secend issue relates to the 80/80 rule. This can be done in two ways. First by measuring a sufficiently large sample to statistically be confident that 80 percent of the devices will pass 80 per cent of the time. However, this can become time consumming and expensive. The second method is to make a resonable assumption on how much variation you could expect from the device being evaluated. This also assumes that the test lab performed a worst case measurement. The manipulated all of the cables, etc. The Measurement Uncertainty usually has a value between 4 to 6 dB. An assumed value allowing for variation in the device can be anywhere from 3 to 6 dB. Therefore, the minimum margin would be about 7 dB and can be up to 12 dB, or more. There is no hard and fast rule as to what you should use for your margin. You will have to establish that quantity depending upon your situation. John Shinn, P.E. Manager, Lab Operations Sanmina-SCI -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Russell Sent: Wednesday, February 27, 2002 1:41 AM To: emc-pstc Subject: EMC Emissions Safety Margins What safety margin below the statutory limits for emc emissions should one aim to achieve to ensure all product samples are likely to pass when a single, peraps two, samples only have been tested. Are there any hard and fast rules? Is being just below the limits considered good enough? Thanks in anticipation for your views and advice. Russell. --- 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"
RE: Bellcore LATA
Alex, Go to the following link for Telcordia (formerly Bellcore) and click on 'Document Center'. The LSSGR (Lata Switiching Systems Generic Requirements) are available from there. http://telecom-info.telcordia.com/site-cgi/ido/index.html John Juhasz Fiber Options Bohemia, NY -Original Message- From: Alex McNeil [mailto:alex.mcn...@ingenicofortronic.com] Sent: Thursday, February 28, 2002 10:08 AM To: emc-p...@majordomo.ieee.org Subject: Bellcore LATA Hi Group, I am not too familiar with the North American requrements: Our customer has requested Surge Protection testing to the Bellcore LATA Switching General Requirements. 600 Vpk metallic, and 2500 Vpk longitudinal. 1. Are you familiar with this spec? 2. Are these requirements covered in any of the Regulatory Telecomms or Safety specs or is our Customer wanting something beyond the regulatory requirements? 3. How can I get a copy of this standard? Kind Regards Alex McNeil Principal Engineer Tel: +44 (0)131 479 8375 Fax: +44 (0)131 479 8321 email: alex.mcn...@ingenicofortronic.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" --- 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"
Bellcore LATA
Hi Group, I am not too familiar with the North American requrements: Our customer has requested Surge Protection testing to the Bellcore LATA Switching General Requirements. 600 Vpk metallic, and 2500 Vpk longitudinal. 1. Are you familiar with this spec? 2. Are these requirements covered in any of the Regulatory Telecomms or Safety specs or is our Customer wanting something beyond the regulatory requirements? 3. How can I get a copy of this standard? Kind Regards Alex McNeil Principal Engineer Tel: +44 (0)131 479 8375 Fax: +44 (0)131 479 8321 email: alex.mcn...@ingenicofortronic.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: ESD Generator confidence test (humor)
This brings up a good real life story. I used to work with a technician (John) who helped with our in-house compliance testing. One day, we were discussing the Horizontal Coupling Plane (HCP) which has a 1MegaOhm drain wire to the Ground Reference Plane (GRP). His theory was that he could stand on the GRP and touch the HCP during a discharge; and he wouldn't feel anything because of the drain wire. I argued that the 1MegaOhm resistance was much higher than his body resistance to ground; so he would get a very noticable "zap". Our theoretical arguments went nowhere. We decided to experiment. I have alot of respect for John; because he beleived strongly enough that he volunteered to be the guinea pig. I set the ESD gun for 4KV and hit the HCP. John's hands jumped from the HCP and he said something like "oooh" or "ouch" (I can't remember exactly). So, let that be a lesson to you guys out there. John already suffered so that others may learn :-) Chris Maxwell | Design Engineer - Optical Division email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | > -Original Message- > From: Chris Chileshe [SMTP:chris.chile...@ultronics.co.uk] > Sent: Thursday, February 28, 2002 7:41 AM > To: 'emc-pstc' > Cc: 'brian_ku...@leco.com' > Subject: RE: ESD Generator confidence test (humor) > > > > Brian proposes a confidence test on ESD guns using colleagues.. > > >> If the ESD gun is working properly, they will fall to the floor > quivering > >> slightly. Then they will wet their pants and forget who they are > for > >> about 25 to 30 minutes. > > A number of questions arise Brian.. > > Is the order of events an essential part of the confidence test i.e. > if they > wet their pants *before* they fall to the floor, will the gun be > deemed to > have failed the test? > > Is there any useful information to be gained from the slight quiver, > i.e. > frequency, amplitude etc which might help with calibration of the > discharge > tip? > > Should the stop-watch be calibrated or would any wrist watch do, > including the lab assistant's own? > > Has any such confidence test resulted in immediate vacancies in the > engineering department, specifically, for a lab assistant. > > Can we extend this principal to confidence tests on surge equipment > using middle management and members of the sales departments? > > Rgds > > - Chris > > -Original Message- > From: brian_ku...@leco.com [SMTP:brian_ku...@leco.com] > Sent: Tuesday, February 26, 2002 3:17 PM > To: emc-p...@majordomo.ieee.org > Subject: Re:RE: ESD Generator confidence test > > > We also have come up with a simple way to test our ESD gun, but it > requires the > help from our lab assistant (lab managers work good too). > > First, have them take off their shoes and socks and stand on the > Ground > Reference Plan. Have them wet their fingers and grab the end of the > ESD gun. Crank up the gun to 16.5KV single shot and let them have it. > > If the ESD gun is working properly, they will fall to the floor > quivering > slightly. Then they will wet their pants and forget who they are for > about 25 to > 30 minutes. > > Keep in mind that this method is not yet approved by A2LA or NAVLAP. > > Have fun, > Brian > > --- > 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 e-mail has been scanned for all viruses by Star Internet. The > service is powered by MessageLabs. For more information on a proactive > anti-virus service working around the clock, around the globe, visit: > http://www.star.net.uk > __ > __ > > __ > __ > This e-mail has been scanned for all viruses by Star Internet. The > service is powered by MessageLabs. For more information on a proactive > anti-virus service working around the clock, around the globe, visit: > http://www.star.net.uk > __ > __ > > -
RE: Vehicle EMC and Safety standards
Hi Group, Thanks to all who responded on my query. The response was as usual of a high calibre. Thanks to this forum I can proceed with the project plan, confident that I have got the Compliance/Regulatory section spot on! Kind Regards Alex McNeil Principal Engineer Tel: +44 (0)131 479 8375 Fax: +44 (0)131 479 8321 email: alex.mcn...@ingenicofortronic.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: EMC Emissions Safety Margins
Yes, I agree with a 3dB margin but I always tell my Design Engineer friends that I want a 3dB minimum margin PK (not QPk). Kind Regards Alex McNeil Principal Engineer Tel: +44 (0)131 479 8375 Fax: +44 (0)131 479 8321 email: alex.mcn...@ingenicofortronic.com -Original Message- From: John Barnes [mailto:jrbar...@iglou.com] Sent: Thursday, February 28, 2002 12:39 PM To: emc-p...@majordomo.ieee.org Subject: Re: EMC Emissions Safety Margins Russell, At IBM and Lexmark, our EMC department was comfortable if one unit showed at least a 3dB margin between the measured emissions and the specified test limits. If we were a little closer than that, and unable to improve the margin for whatever reason, they would have us test two more units. Then if all three units had over 1.5dB margin they would pass us, but might require us to retest production units quarterly or after every significant hardware/software-design change. They also asked us to be up-front with them, and to show them our pre-approval runs to prove that these measured emission peaks did not change much run-to-run. John Barnes dBi Corporation --- 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"
RE: ESD Generator confidence test (humor)
Brian proposes a confidence test on ESD guns using colleagues.. >> If the ESD gun is working properly, they will fall to the floor quivering >> slightly. Then they will wet their pants and forget who they are for >> about 25 to 30 minutes. A number of questions arise Brian.. Is the order of events an essential part of the confidence test i.e. if they wet their pants *before* they fall to the floor, will the gun be deemed to have failed the test? Is there any useful information to be gained from the slight quiver, i.e. frequency, amplitude etc which might help with calibration of the discharge tip? Should the stop-watch be calibrated or would any wrist watch do, including the lab assistant's own? Has any such confidence test resulted in immediate vacancies in the engineering department, specifically, for a lab assistant. Can we extend this principal to confidence tests on surge equipment using middle management and members of the sales departments? Rgds - Chris -Original Message- From: brian_ku...@leco.com [SMTP:brian_ku...@leco.com] Sent: Tuesday, February 26, 2002 3:17 PM To: emc-p...@majordomo.ieee.org Subject:Re:RE: ESD Generator confidence test We also have come up with a simple way to test our ESD gun, but it requires the help from our lab assistant (lab managers work good too). First, have them take off their shoes and socks and stand on the Ground Reference Plan. Have them wet their fingers and grab the end of the ESD gun. Crank up the gun to 16.5KV single shot and let them have it. If the ESD gun is working properly, they will fall to the floor quivering slightly. Then they will wet their pants and forget who they are for about 25 to 30 minutes. Keep in mind that this method is not yet approved by A2LA or NAVLAP. Have fun, Brian --- 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 e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk --- 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: EMC Emissions Safety Margins
Russell, At IBM and Lexmark, our EMC department was comfortable if one unit showed at least a 3dB margin between the measured emissions and the specified test limits. If we were a little closer than that, and unable to improve the margin for whatever reason, they would have us test two more units. Then if all three units had over 1.5dB margin they would pass us, but might require us to retest production units quarterly or after every significant hardware/software-design change. They also asked us to be up-front with them, and to show them our pre-approval runs to prove that these measured emission peaks did not change much run-to-run. John Barnes dBi Corporation --- 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: PSE mark
Michelle, On Wed, 27 Feb 2002 14:45:31 +0900, "Michelle Cho / INT Compliance" wrote: > Could anyone give me some details about PSE mark and the test lab > who can give me quote? I guess what you mean is the marking required by Japanese DENAN. Short introduction I wrote is available at: http://member.nifty.ne.jp/tsato/terms/denan-e.html Regards, Tom -- Tomonori Sato URL: http://member.nifty.ne.jp/tsato/ xvkbd-2.1 (virtual keyboard for X) available --- 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"
