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Best regards, Garry Hojan SCS www.regulatory-compliance.com -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Michael Hopkins Sent: Tuesday, November 12, 2002 5:10 PM To: Gary McInturff; EMC-PSTC (E-mail) Subject: Re: GR-78 Circuit pack ESD test. Gary -- I just had the office email me a copy of the simulator description from GR-78 and I'm amazed this is still in use. In the last few years, there has been a lot of new data, and standards for ESD have evolved considerably (BELLCORE GR 1089 is essentially the same as IEC 61000-4-2). Verfiying the waveform using a scope and target with a bandwidth of only 350MHz is less than adaquate -- work being done today uses 3.5GHz scopes and 10GHz targets in order to insure that the high frequency ringing and actual current amplitudes are observed. Anyway, that isn't the point --- we, or others, could provide an ESD gun with virtually any R, and any C up to about 1000pf (bigger caps won't fit into some guns). What I'm not sure of is whether or not we can fit into the waveform specifications: 2 - 10ns is extemely slow -- IEC and Bellcore are all 0.7 to 1ns and ANSI is 400ps, AND to measure the peaks with a 350MHz bandwidth scope would require adding some filtering -- if we use our faster scopes and targets, we'll see the REAL peak current, that will likely be quite a bit higher than the tables of GR78 show. Don't know about the durations, but we these could be measured easily -- they are probably okay because they're not so dependant on the bandwidth of the scope/target combination. Strongly suggest you consider using the IEC test from 1089, which is supposed to be the primary environmental document anyway.... It's based on IEC, simulators are readily available, and it's a realistic test with a lot of precidence.... Hope this is helpful, Best Regards, Mike Hopkins Thermo KeyTek ----- Original Message ----- From: "Gary McInturff" <[email protected]> To: "EMC-PSTC (E-mail)" <[email protected]> Sent: Monday, November 11, 2002 6:43 PM Subject: GR-78 Circuit pack ESD test. Anybody know what equipment provides the waveform described above? Its much slower than the IEC801 waveform. I tried Keytek and they don't have it. Other suggestions to perform the test - just use the IEC waveform? Gary ------------------------------------------- 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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] 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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] 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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] 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"
