U.S. National Product Safety Laws
Here is my understanding of this issue relative to ITE. I post this both to inform, and solicit comments which could improve my understanding. The only U.S. Federal law I am aware of pertaining to product safety is that covered in 29 CFR 1900 (the OSHA section). Electrical equipment to be used in the U.S. workplace must either (1) comply with a detailed list of construction requirements, or (2) be accepted, certified, listed, labelled, or otherwise determined to be safe by a nationally recognized testing laboratory [29 CFR 1900.399 (a) (ii)]. There are seventeen OSHA approved NRTLs, half of which can test to UL 1950. Summary: For workplace ITE, an NRTL certification is the easiest option. Note that this is an option, not the only path. Note also that UL and other NRTLs are private companies, not U.S. government agencies. What about non-workplace ITE for consumers? These are outside the OSHA requirements. Some of the major cities in the U.S. (e.g. New York, Los Angeles, Chicago) have local electrical codes that include the electrical requirements for household eletrical equipment. However, these are usually in the absence of any NRTL listing, which is generally acceptable. Summary: Again, an NRTL certification is the easiest path to market home electrical products in all parts of the U.S. One CAN find electrical products on the market that bear no agency markings that are being sold in ways that do not conform to OSHA requirements or city electrical codes. However, these tend to be very cheap low end products like Christmas lighting, extension cords, etc. The Consumer Products Safety Commission (CPSC) is a Federal agency. It does not establish product safety requirements. However, its mission is to identify and remove from the marketplace any products found prone to expose hazards. It is an after-the-fact enforcement agency that can apply pressure for a a product recall. Moral: A manufacturer can either negotiate the mine field of specific OSHA (for workplace) or city (for home use) electrical requirements, or go with an NRTL certification. George Alspaugh Corporate Product Safety Lexmark International Inc. - 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: National Safety Requirements?????
I agree with Rich's explanation (although I couldn't originally find the right words to respond). I would like to add that the NEC (National Electric Code) in section 300 (? - looks like someone took my copy) basically states: an electronic product connected to the public power must be approved for it's end use by evaluation to an applicable standard by a Nationally Recognized Testing Laboratory (NRTL). Therefore, the 'national standard' would be the NEC - which cross references (vaguely) to what would most likely be a UL standard. John A. Juhasz Product Qualification Compliance Engr. Fiber Options, Inc. 80 Orville Dr. Suite 102 Bohemia, NY 11716 USA Tel: 516-370-1324 Fax: 516-567-8322 Hi Kathy: Someone who seemed to believe such a edict was sent out resently asked me to check to I asked this group. Maybe this is just a very bad joke from someone who really doesn't know what he is asking. I wouldn't cross off the question this way. Be aware that there are a number of safety standards in the USA that COULD fit the definition of a National Safety Requirement. Consider: 1. Any standard that is an American National Standard could fit the definition. Most UL standards are also American National Standards. 2. National Electrical Code, which is an American National Standard and is the basis for most U.S.A. product safety standards. Published by the NFPA, National Fire Protection Association. 3. National Electrical Safety Code, which is an American National Standard, published by the NFPA, National Fire Protection Association. This standard deals with protection of people in public and work places. Since each of these is an American National Standard, then it COULD be the one your colleague had in mind, but did not have the name correctly stated. Best regards, Rich - Richard Nute Product Safety Engineer Hewlett-Packard Company Product Regulations Group AiO Division Tel : +1 858 655 3329 16399 West Bernardo Drive FAX : +1 858 655 4979 San Diego, California 92127 e-mail: ri...@sdd.hp.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: Equipment for development
Tim, I am not aware that the different states have different approaches; however, the local authorities, including your customer, might have different ideas, especially with respect to safety. That is why I recommend that you contact your customer to ask him what their expectations are specific to safety. My expectations for safety, as a minimum, would be a complete design review for safety compliance, an individual product safety inspection by you product safety engineer of the specific unit that is to be shipped out, and a hipot test and ground resistance test at the appropriate voltage for your product.Be aware that Underwriters Laboratories has a program where a UL inspector/engineer will go out to a site and perform visual inspection for basic safety (may require supporting documentation from you!) and may require hipot tests at the site, and then affix their own UL mark (which is different from the one you can affix to the product). All this is a lot of rigmarole that may be definitely worthwhile to minimize any liability issues that may arise. You can obtain details from UL. Our process is to obtain official safety approvals before we ship any so-called BETA systems (still under development) to any potential customers. For compliance to FCC Part 15 (EMC), the federal regulators are quite specific. For Class A product only, you are allowed to ship systems still under development, provided the customer is advised that this equipment has not yet been tested for compliance, but will comply when finally shipped...All this is specified in Part 2 of the Rules. What many people don't realize is that FCC Rules Part 15 are the technical part, and Part 2 the general and administrative part that still apply to all equipment covered under the other parts. I always advise that the letter stating the above be addressed to a specific person and reference the specific model and serial number that is being shipped. You want to show due diligence in case the authorities have any questions. Tania Grant, tgr...@lucent.com tgr...@lucent.com Lucent Technologies, Communications Applications Group -- From: tim.hay...@gecm.com [SMTP:tim.hay...@gecm.com] Sent: Monday, August 16, 1999 8:12 AM To: emc-p...@ieee.org Subject: Equipment for development Hi Everybody, I have some equipment that is currently under development for an American company. While the design of the equipment still has to be finalised, the customer requires a set of units to run on a simulator for test purposes. Apart from the obvious requirement that these development units must not cause harm, are there any specific requirements for safety or EMC (etc.) that *must* be complied with? I don't know (at this time of writing) which State the company is located - is there any serious differences between States that must be considered? Regards Tim - 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). - 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 test chamber -- Reverberation and Others
Barry, NIST has put lots of effort to promote RC and achieved significant results through experimental approach. They deserved the honor of the best symposium paper. However, I guess we are the first team to study RC through modeling simulation approach building the 3-D RC model and obtaining the full wave solution of Maxwell equations. Lots of appreciation and encouragement was offered by audience after my presentation during the symposium. Does the community think our tried-out is a good kick-off??? Rgds, Leslie --- b...@anritsu.com wrote: Leslie, Thanks for the valuable info. You mentioned two articles in EMC'99 Seattle Symposium Record. Actually, right before them on pp. 1-6 of Vol. 1 is Reverberation Chamber Relationship: Corrections and Improvements by John Ladbury and Galen Koepke, which won the award of the best Symposium technical paper at Seattle. Barry Ma Morgan Hill, CA -- Original Text -- From: Leslie Bai leslie_...@yahoo.com, on 8/15/99 7:16 PM: I have studied Reverberation Chambers for some time, refer to recent EMC'99 Seattle Symposium Record Vol. 1, Page 7 to page 16. Measurement comparison will be published in the near future. Cost: RC is about 20 to 30% of an equivalent AC. Standards: There is a joint CISPR (emissions) and IEC (immunity) committee working to produce a common standard for RCs. Immunity standard can be found in IEC 61000-4-3, Anex I. I have no doubt there will eventually be an emissions standard which permits RC use. However, it is unlikely that an operative standard will be available in 2 years. Technology: RC uses statistical analysis to perform EMC measurement. It is realized by changing the boundary conditions using stirring paddle(s). However, the restriction of the Lowest Usable Frequency (LUF) may be a problem which is under study in the community. General comments: If you need to do emission and immunity certification testing in the near term, my recommendation would be for AC. It is the most expensive solution but it is acceptable today and if used properly (i.e., robust, many aspect angle tests) will provide detailed information on EUT characteristics. A RC will be a cost effective approach to a test facility for some test objectives (e.g., identifying emission frequencies very quickly and positively) and in the longer term will be the most cost effective. Rgds, Leslie --- Ray Levasseur ray_levass...@hotmail.com wrote: Thanks Barry for the suggestion but I know nothing about reverberation chambers, possibly somone could comment on the merits of RC over AC. Ray Levasseur EMC Compliance Creo Products From: b...@anritsu.com (Bailin Ma) Reply-To: b...@anritsu.com (Bailin Ma) To: emc-p...@ieee.org Subject: EMC test chamber -- Reverberation and Others Date: Fri, 13 Aug 1999 9:13:21 PDT Ray, Did you consider using Reverberation Chamber (RC) instead of semi-anechoic chamber for pre-compliance? It seems to me that RC technique has become practically applicable for both emission and immunity tests. It's less expensive. Official EMC standards would accept it in a couple of years. IEC 61000-4-21: Reverberation Chamber is circulating for comments. I know little about RC and expect some knowledgeable colleagues to make comments. Barry Ma Anritsu Company -Original Message- From: Ray Levasseur [mailto:ray_levass...@hotmail.com] Sent: Wednesday, August 11, 1999 2:44 PM To: emc-p...@majordomo.ieee.org Subject: Wanted:EMC test chamber Hi Group, I am setting up pre-compliance EMC testing at our facility and need some equipment to complete my setup. I was planning on a 3m shielded room with the possibility of making it semi-anechoic when the budget allows. Our products are large (relative to normal ITE equipment) with the largest that would be tested in the chamber 10ft wide X 6ft long X 3ft high. I have most of the equipment I need to do the tests for EN 55022 and EN 50082. I need a motorized antenna mast that goes from 1-4m and a chamber. If anyone could direct me to a person or company selling the chamber or antenna mast I would greatly appreciate it. Also I would like to get some feedback on the Cassper virtual chamber and if anyone has used it or has comments on the usability of such a system. Thanks, Ray Levasseur EMC Compliance, Creo Products - 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: National Safety Requirements?????
Hi Kathy: Someone who seemed to believe such a edict was sent out resently asked me to check to I asked this group. Maybe this is just a very bad joke from someone who really doesn't know what he is asking. I wouldn't cross off the question this way. Be aware that there are a number of safety standards in the USA that COULD fit the definition of a National Safety Requirement. Consider: 1. Any standard that is an American National Standard could fit the definition. Most UL standards are also American National Standards. 2. National Electrical Code, which is an American National Standard and is the basis for most U.S.A. product safety standards. Published by the NFPA, National Fire Protection Association. 3. National Electrical Safety Code, which is an American National Standard, published by the NFPA, National Fire Protection Association. This standard deals with protection of people in public and work places. Since each of these is an American National Standard, then it COULD be the one your colleague had in mind, but did not have the name correctly stated. Best regards, Rich - Richard Nute Product Safety Engineer Hewlett-Packard Company Product Regulations Group AiO Division Tel : +1 858 655 3329 16399 West Bernardo Drive FAX : +1 858 655 4979 San Diego, California 92127 e-mail: ri...@sdd.hp.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 test chamber -- Reverberation and Others
Hi Jim, You are right. There was a Session 1A -- Reverberation Chamber, consisting of 6 technical papers, pp. 1- 29, Vol. 1, 1999 IEEE EMC Symposium at Seattle. Besides it, there was a Tutorial Session WS3 -- Reverberation Chamber Workshop in the Symposium as well. It comprises T3.1Desired Characteristics of an EMC test T3.2Comments by Current RC users T3.3Measurement Procedures in RC T3.4Overview of RC Theory T3.5Status of RC Standards Barry Ma -- Original Text -- From: Knighten, Jim L jk100...@exchange.sandiegoca.ncr.com, on 8/16/99 8:45 AM: Guys, There was an entire session on Reverberation Chambers in the IEEE EMC Symposium held two weeks ago in Seattle. You might find some good stuff in the papers. If you are a Society member, they produced a CD-ROM of all the papers, which is available for the asking, I'm told. Like you, I am not an expert in Reverb chambers. Jim Dr. Jim Knightene-mail: jim.knigh...@sandiegoca.ncr.com mailto:jim.knigh...@sandiego.ncr.com Senior Consulting Engineer NCR 17095 Via del Campo San Diego, CA 92127 http://www.ncr.com http://www.ncr.com Tel: 858-485-2537 Fax: 858-485-3788 * Notice the Area Code change from 619 * -Original Message- From: Ray Levasseur [mailto:ray_levass...@hotmail.com] Sent: Friday, August 13, 1999 3:15 PM To: b...@anritsu.com; emc-p...@ieee.org Subject:Re: EMC test chamber -- Reverberation and Others Thanks Barry for the suggestion but I know nothing about reverberation chambers, possibly somone could comment on the merits of RC over AC. Ray Levasseur EMC Compliance Creo Products From: b...@anritsu.com (Bailin Ma) Reply-To: b...@anritsu.com (Bailin Ma) To: emc-p...@ieee.org Subject: EMC test chamber -- Reverberation and Others Date: Fri, 13 Aug 1999 9:13:21 PDT Ray, Did you consider using Reverberation Chamber (RC) instead of semi-anechoic chamber for pre-compliance? It seems to me that RC technique has become practically applicable for both emission and immunity tests. It's less expensive. Official EMC standards would accept it in a couple of years. IEC 61000-4-21: Reverberation Chamber is circulating for comments. I know little about RC and expect some knowledgeable colleagues to make comments. Barry Ma Anritsu Company -Original Message- From: Ray Levasseur [mailto:ray_levass...@hotmail.com] Sent: Wednesday, August 11, 1999 2:44 PM To: emc-p...@majordomo.ieee.org Subject: Wanted:EMC test chamber Hi Group, I am setting up pre-compliance EMC testing at our facility and need some equipment to complete my setup. I was planning on a 3m shielded room with the possibility of making it semi-anechoic when the budget allows. Our products are large (relative to normal ITE equipment) with the largest that would be tested in the chamber 10ft wide X 6ft long X 3ft high. I have most of the equipment I need to do the tests for EN 55022 and EN 50082. I need a motorized antenna mast that goes from 1-4m and a chamber. If anyone could direct me to a person or company selling the chamber or antenna mast I would greatly appreciate it. Also I would like to get some feedback on the Cassper virtual chamber and if anyone has used it or has comments on the usability of such a system. Thanks, Ray Levasseur EMC Compliance, Creo Products - 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). __ Get Your
Re: EMC test chamber -- Reverberation and Others
Leslie, Thanks for the valuable info. You mentioned two articles in EMC'99 Seattle Symposium Record. Actually, right before them on pp. 1-6 of Vol. 1 is Reverberation Chamber Relationship: Corrections and Improvements by John Ladbury and Galen Koepke, which won the award of the best Symposium technical paper at Seattle. Barry Ma Morgan Hill, CA -- Original Text -- From: Leslie Bai leslie_...@yahoo.com, on 8/15/99 7:16 PM: I have studied Reverberation Chambers for some time, refer to recent EMC'99 Seattle Symposium Record Vol. 1, Page 7 to page 16. Measurement comparison will be published in the near future. Cost: RC is about 20 to 30% of an equivalent AC. Standards: There is a joint CISPR (emissions) and IEC (immunity) committee working to produce a common standard for RCs. Immunity standard can be found in IEC 61000-4-3, Anex I. I have no doubt there will eventually be an emissions standard which permits RC use. However, it is unlikely that an operative standard will be available in 2 years. Technology: RC uses statistical analysis to perform EMC measurement. It is realized by changing the boundary conditions using stirring paddle(s). However, the restriction of the Lowest Usable Frequency (LUF) may be a problem which is under study in the community. General comments: If you need to do emission and immunity certification testing in the near term, my recommendation would be for AC. It is the most expensive solution but it is acceptable today and if used properly (i.e., robust, many aspect angle tests) will provide detailed information on EUT characteristics. A RC will be a cost effective approach to a test facility for some test objectives (e.g., identifying emission frequencies very quickly and positively) and in the longer term will be the most cost effective. Rgds, Leslie --- Ray Levasseur ray_levass...@hotmail.com wrote: Thanks Barry for the suggestion but I know nothing about reverberation chambers, possibly somone could comment on the merits of RC over AC. Ray Levasseur EMC Compliance Creo Products From: b...@anritsu.com (Bailin Ma) Reply-To: b...@anritsu.com (Bailin Ma) To: emc-p...@ieee.org Subject: EMC test chamber -- Reverberation and Others Date: Fri, 13 Aug 1999 9:13:21 PDT Ray, Did you consider using Reverberation Chamber (RC) instead of semi-anechoic chamber for pre-compliance? It seems to me that RC technique has become practically applicable for both emission and immunity tests. It's less expensive. Official EMC standards would accept it in a couple of years. IEC 61000-4-21: Reverberation Chamber is circulating for comments. I know little about RC and expect some knowledgeable colleagues to make comments. Barry Ma Anritsu Company -Original Message- From: Ray Levasseur [mailto:ray_levass...@hotmail.com] Sent: Wednesday, August 11, 1999 2:44 PM To: emc-p...@majordomo.ieee.org Subject: Wanted:EMC test chamber Hi Group, I am setting up pre-compliance EMC testing at our facility and need some equipment to complete my setup. I was planning on a 3m shielded room with the possibility of making it semi-anechoic when the budget allows. Our products are large (relative to normal ITE equipment) with the largest that would be tested in the chamber 10ft wide X 6ft long X 3ft high. I have most of the equipment I need to do the tests for EN 55022 and EN 50082. I need a motorized antenna mast that goes from 1-4m and a chamber. If anyone could direct me to a person or company selling the chamber or antenna mast I would greatly appreciate it. Also I would like to get some feedback on the Cassper virtual chamber and if anyone has used it or has comments on the usability of such a system. Thanks, Ray Levasseur EMC Compliance, Creo Products - 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). __ Get Your Private, Free Email at http://www.hotmail.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). _ 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:
RE: EMC test chamber -- Reverberation and Others
Guys, There was an entire session on Reverberation Chambers in the IEEE EMC Symposium held two weeks ago in Seattle. You might find some good stuff in the papers. If you are a Society member, they produced a CD-ROM of all the papers, which is available for the asking, I'm told. Like you, I am not an expert in Reverb chambers. Jim Dr. Jim Knightene-mail: jim.knigh...@sandiegoca.ncr.com mailto:jim.knigh...@sandiego.ncr.com Senior Consulting Engineer NCR 17095 Via del Campo San Diego, CA 92127 http://www.ncr.com http://www.ncr.com Tel: 858-485-2537 Fax: 858-485-3788 * Notice the Area Code change from 619 * -Original Message- From: Ray Levasseur [mailto:ray_levass...@hotmail.com] Sent: Friday, August 13, 1999 3:15 PM To: b...@anritsu.com; emc-p...@ieee.org Subject:Re: EMC test chamber -- Reverberation and Others Thanks Barry for the suggestion but I know nothing about reverberation chambers, possibly somone could comment on the merits of RC over AC. Ray Levasseur EMC Compliance Creo Products From: b...@anritsu.com (Bailin Ma) Reply-To: b...@anritsu.com (Bailin Ma) To: emc-p...@ieee.org Subject: EMC test chamber -- Reverberation and Others Date: Fri, 13 Aug 1999 9:13:21 PDT Ray, Did you consider using Reverberation Chamber (RC) instead of semi-anechoic chamber for pre-compliance? It seems to me that RC technique has become practically applicable for both emission and immunity tests. It's less expensive. Official EMC standards would accept it in a couple of years. IEC 61000-4-21: Reverberation Chamber is circulating for comments. I know little about RC and expect some knowledgeable colleagues to make comments. Barry Ma Anritsu Company -Original Message- From: Ray Levasseur [mailto:ray_levass...@hotmail.com] Sent: Wednesday, August 11, 1999 2:44 PM To: emc-p...@majordomo.ieee.org Subject: Wanted:EMC test chamber Hi Group, I am setting up pre-compliance EMC testing at our facility and need some equipment to complete my setup. I was planning on a 3m shielded room with the possibility of making it semi-anechoic when the budget allows. Our products are large (relative to normal ITE equipment) with the largest that would be tested in the chamber 10ft wide X 6ft long X 3ft high. I have most of the equipment I need to do the tests for EN 55022 and EN 50082. I need a motorized antenna mast that goes from 1-4m and a chamber. If anyone could direct me to a person or company selling the chamber or antenna mast I would greatly appreciate it. Also I would like to get some feedback on the Cassper virtual chamber and if anyone has used it or has comments on the usability of such a system. Thanks, Ray Levasseur EMC Compliance, Creo Products - 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). __ Get Your Private, Free Email at http://www.hotmail.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). - This message is coming from the emc-pstc discussion list. To cancel
Re: New ISO9000-2000
I have been informed about a standard name TL 9000 which could be adopted as Quality standard for Telecoms industrials (soft, hard and services). Unfortunately I have not the standard itself. Is there a link between ISO9000-2000 and TL 9000 ? Nezam Najafi wrote: To All: Dose anyone have any information concerning a draft copy of ISO9000-2000 that will supersede ISO 9001 and ISO 9002. I do appreciate any response in advance. Regards, Nezam Najafi Sr. Compliance Engineer Madge Networks, Inc. 625 Industrial Way West Eatontown, NJ 07724 Voice: 732-460-6825 - 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). attachment: vcard.vcf
Doubt on radiated emissions measurements
Muriel, we expereinced similar problems and idetified following phenomenon: You have a loop consisting of: PE (outlet) - Power cord receiver - receiver casing - coax cable for measurement - -cell casing - PE - PE (outlet). You'll have some significant HF currents flowing through this loop if you have sources in your environment. Since the coupling impedance of your coax cable is not zero, you'll measure some voltage at the input of the reciever. Try following: A: Shortcut the coax cable, by bonding the receiver to the cell. Keep the area of the remaining toop small. A poerline filter for the receiver, bonded to the cell also helps. B: reduce the currents in the loop (ferrites) C: take another cable, having a better coupling impedance. Hope this helps Best regards George Dancau g.m.dan...@ieee.org - 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).
Equipment for development
Hi Everybody, I have some equipment that is currently under development for an American company. While the design of the equipment still has to be finalised, the customer requires a set of units to run on a simulator for test purposes. Apart from the obvious requirement that these development units must not cause harm, are there any specific requirements for safety or EMC (etc.) that *must* be complied with? I don't know (at this time of writing) which State the company is located - is there any serious differences between States that must be considered? Regards Tim - 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).
Internal ESD testing EN55024
First I would like to thank the group.As usual the open sharing of ideas provides a lot of insight to me. I have one question though - I am particularly interested in the requirements for EN55024. Has anyone changes their ESD procedures as a result of the internal ESD requirement of the spec? Thank you Charles Grasso Advisory Engineer StorageTek 1 StorageTek Drive Louisville CO 80027 M/S 4247. Tel:303-673-2908 Fax:303-661-7115 email:gra...@louisville.stortek.com RMCEMC Web Site: http://www.ewh.ieee.org/r5/denver/rockymountainemc/ - 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).
Doubt on radiated emissions measurements
Dear Group, I'm using a Strip Line Cell (S-Line) from RohdeSchwarz for doing radiated emissions testing. Using the CISPR 22 limits of frequency (30MHz - 1GHz), appeared a spurious signal at the frequency of 205,25MHz, and the cell was empty (no EUT inside it)!! Well, I thought about two assumptions: # The PE terminal (earth) i'm using is the one from the power installation (my outlet has phase, neutral and ground). So, I thought that I must use an exclusive ground for the cell, i.e., a ground that I build only for this equipment... # The cell isn't nice, so, the problem is with the vendor.. If someone has experience with this, please feel free to do any comments... Regards Muriel -- == Muriel Bittencourt de Liz GRUCAD - Conception Analysis of Electromagnetic Devices Group Federal University of Santa Catarina PO Box: 476 ZIP: 88040-900 - Florianópolis - SC - BRAZIL Phone: +55.48.331.9649 - Fax: +55.48.234.3790 e-mail: mur...@grucad.ufsc.br ICQ#: 9089332 - 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).
Safety of power supplies
Hello group, Is anyone out there aware of an EN standard that specifically deals with the safety of power supplies - the one in question operates on 230V single-phase and has up to six outputs one of which is as high as 1300V for a current of 0.5A. Thank you in advance for your usual co-operation. Fowell Whitfield Safety Technician Rhein Tech Labs. - 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: New ISO9000-2000
Useful info on ISO 9000-2000, though not the actual draft standard, is available from BSI: http://www.bsi.org.uk/iso-tc176-sc2/executive.htm The home page of the responsible technical committee in ISO is at: http://www.bsi.org.uk/iso-tc176-sc2/ Roger Viles WWG Nezam Najafi nezam.naj...@madge.com on 13/08/99 18:30:36 Please respond to Nezam Najafi nezam.naj...@madge.com To: emc-p...@majordomo.ieee.org cc:(bcc: Roger Viles/PLY/Global) Subject: New ISO9000-2000 To All: Dose anyone have any information concerning a draft copy of ISO9000-2000 that will supersede ISO 9001 and ISO 9002. I do appreciate any response in advance. Regards, Nezam Najafi Sr. Compliance Engineer Madge Networks, Inc. 625 Industrial Way West Eatontown, NJ 07724 Voice: 732-460-6825 - 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). - 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: Meters and Monitors for ELF-VLF
Muriel, A whole range of EMF meters is offered by Wavetek Wandel Goltermann (http://www.wg.com/) Contact Wavetek Wandel Goltermann Brasil: Wandel Goltermann Instr. Ltda. Cia. Av. Eng. Luis Carlos Berrini, 936/8§ e 9§ andares 04571-000 SÆo Paulo / SP - Brasil WGB Eletrnica de PrecisÆo Ltda. Via das Samambaias, 101 06713-280 - Cotia / SP - Brasil Tel.: + 55 11 5503-3800 Fax: + 55 11 5505-1598 E-mail: sales.bra...@wwgsolutions.com See EMF testers at: http://www.wg.com/products/emf/en/emf_en.html and WWG's Brasil website in Portuguese at: http://brasil.wg.com/ Roger Viles WWG Muriel Bittencourt de Liz mur...@grucad.ufsc.br on 13/08/99 15:53:43 Please respond to Muriel Bittencourt de Liz mur...@grucad.ufsc.br To: Lista de EMC da IEEE emc-p...@ieee.org cc:(bcc: Roger Viles/PLY/Global) Subject: Meters and Monitors for ELF-VLF Hello Group, I need some low frequency meters covering the ELF/VLF spectrum from 0 Hertz to 400-500kHz for both electric and magnetic fields. The meters must be TRUE RMS responding for accurate response to varied waveforms with both isotropic and single-axis sensors. I need to measure in the ambient the fields produced by: transmission lines (50/60Hz), computer monitors, video displays, power lines and line-powered equipment, industrial heat treating equipment, home appliances, etc. So, what I really need is contacts of some manufacturers of this kind of equipment. Please, reply the e-mail directly to me. Thanks in advance for the ones who can help. Best Regards Muriel -- == Muriel Bittencourt de Liz GRUCAD - Conception Analysis of Electromagnetic Devices Group Federal University of Santa Catarina PO Box: 476 ZIP: 88040-900 - Florian¢polis - SC - BRAZIL Phone: +55.48.331.9649 - Fax: +55.48.234.3790 e-mail: mur...@grucad.ufsc.br ICQ#: 9089332 - 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). - 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: Posters
I have a poster from TUV Product Services: A Guide to CE Marking Electrotechnical Products. This gives summary info on what's required to comply with 6 EC Directives. See www.tuvps.co.uk or mail i...@ti.tuvps.co.uk Davis, Mike mike_da...@adc.com on 13/08/99 19:42:57 Please respond to Davis, Mike mike_da...@adc.com To: Davis, Mike mike_da...@adc.com, 'EMC-PSTC Regulatory E-Mail (E-mail)' emc-p...@ieee.org cc:(bcc: Roger Viles/PLY/Global) Subject: RE: Posters Ask and you shall receive!.. Seek and you shall find!.. EMC-PSTC has again been fruitful! Please Continue. (FERRY?... WHAT'S UP WIT DAT? ... Excuse my type-o in my previous message.) -Original Message- From: Davis, Mike Sent: Friday, August 13, 1999 9:33 AM To: EMC-PSTC Regulatory E-Mail (E-mail) Subject: Posters I have an interest in knowing where to get EMI/EMC/Safety posters to hang up in and around my office. Does anyone of you know of what posters are available and from whom they may be ordered. I presently have two informative posters hanging on the walls of my office as follows: The CHASE guide to EMISSIONS IMMUNITY; Chase EMC, Inc., 230 Route 206, Building No.2, Flanders, New Jersey 07836, Tel 201 252-8001. USA Frequency Allocations 500kHz to 4GHz; Fair-rite Products Corp., One Commercial Row, Wallkill, NY 12589-0288. The information listed on these two poster are ferry useful as a quick reference. Some of you may have these posted already, because I have seen them in many test labs that I have used in the past. Thanks in advance. Regards, Michael S. Davis Compliance Engineer ADC Broadband Communications 203 630-5788 mike_da...@adc.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). - 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).
Antenna preamplifier
Dear All, Can anyone recommend a suplier of an antenna preamplifier for a TEM celle connected to a spectrum analyzer, for measuring from 30MHz to 1GHz. I need arround 10 - 20 dB gain Best regards, Mr. Kim Boll Jensen i-data, Denmark - 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 test chamber -- Reverberation and Others
I have studied Reverberation Chambers for some time, refer to recent EMC'99 Seattle Symposium Record Vol. 1, Page 7 to page 16. Measurement comparison will be published in the near future. Cost: RC is about 20 to 30% of an equivalent AC. Standards: There is a joint CISPR (emissions) and IEC (immunity) committee working to produce a common standard for RCs. Immunity standard can be found in IEC 61000-4-3, Anex I. I have no doubt there will eventually be an emissions standard which permits RC use. However, it is unlikely that an operative standard will be available in 2 years. Technology: RC uses statistical analysis to perform EMC measurement. It is realized by changing the boundary conditions using stirring paddle(s). However, the restriction of the Lowest Usable Frequency (LUF) may be a problem which is under study in the community. General comments: If you need to do emission and immunity certification testing in the near term, my recommendation would be for AC. It is the most expensive solution but it is acceptable today and if used properly (i.e., robust, many aspect angle tests) will provide detailed information on EUT characteristics. A RC will be a cost effective approach to a test facility for some test objectives (e.g., identifying emission frequencies very quickly and positively) and in the longer term will be the most cost effective. Rgds, Leslie --- Ray Levasseur ray_levass...@hotmail.com wrote: Thanks Barry for the suggestion but I know nothing about reverberation chambers, possibly somone could comment on the merits of RC over AC. Ray Levasseur EMC Compliance Creo Products From: b...@anritsu.com (Bailin Ma) Reply-To: b...@anritsu.com (Bailin Ma) To: emc-p...@ieee.org Subject: EMC test chamber -- Reverberation and Others Date: Fri, 13 Aug 1999 9:13:21 PDT Ray, Did you consider using Reverberation Chamber (RC) instead of semi-anechoic chamber for pre-compliance? It seems to me that RC technique has become practically applicable for both emission and immunity tests. It's less expensive. Official EMC standards would accept it in a couple of years. IEC 61000-4-21: Reverberation Chamber is circulating for comments. I know little about RC and expect some knowledgeable colleagues to make comments. Barry Ma Anritsu Company -Original Message- From: Ray Levasseur [mailto:ray_levass...@hotmail.com] Sent: Wednesday, August 11, 1999 2:44 PM To: emc-p...@majordomo.ieee.org Subject: Wanted:EMC test chamber Hi Group, I am setting up pre-compliance EMC testing at our facility and need some equipment to complete my setup. I was planning on a 3m shielded room with the possibility of making it semi-anechoic when the budget allows. Our products are large (relative to normal ITE equipment) with the largest that would be tested in the chamber 10ft wide X 6ft long X 3ft high. I have most of the equipment I need to do the tests for EN 55022 and EN 50082. I need a motorized antenna mast that goes from 1-4m and a chamber. If anyone could direct me to a person or company selling the chamber or antenna mast I would greatly appreciate it. Also I would like to get some feedback on the Cassper virtual chamber and if anyone has used it or has comments on the usability of such a system. Thanks, Ray Levasseur EMC Compliance, Creo Products - 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). __ Get Your Private, Free Email at http://www.hotmail.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). _ 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).
