One question that struck me is: Why isn't a spectrum analyzer used to verify the waveform? Most labs don't have a 4Ghz oscilloscope; but they almost all have a 10Ghz spectrum analyzer. It seems that the spectrum of the waveform should be just as traceable and repeatable as the waveform itself.
>From my own experience, I use this method to quickly verify our EFT generator in our own lab (although I'm just a manufacturer, not a third party lab). We have the EFT generator calibrated yearly; and whenever I use it, I turn on the spectrum analyzer and read the spectrum just to make sure that it's working. 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: Pommerenke, David [SMTP:davi...@umr.edu] > Sent: Thursday, May 08, 2003 5:46 PM > To: John Woodgate; emc-p...@majordomo.ieee.org > Subject: RE: ESD gun verification > > > John, > > The IEC TC77b WG-9 made clarification for what was intended to be > understood as "verification" and what was intended to be a > "calibration". Different words are used now, but the new version of he > standard 77b/378/CDV tries to eliminate the misunderstanding by some > metrologists. They think that the present standard requires a traceble > calibration as a daily or weekly test, not only a yearly calibration. > > David Pommerenke > > > > > -----Original Message----- > From: John Woodgate [mailto:j...@jmwa.demon.co.uk] > Sent: Thursday, May 08, 2003 1:25 PM > To: emc-p...@majordomo.ieee.org > Subject: Re: ESD gun verification > > > I read in !emc-pstc that Pommerenke, David <davi...@umr.edu> wrote (in > <a5d66e6b6f478b48a3cef22aa4b9fca378e...@umr-mail1.umr.edu>) about 'ESD > gun verification' on Wed, 7 May 2003: > > >Brain, > > Spelling! > > > >I like to repeat: For "verification" you do not need calibrated > >equipment or full bandwidth. The "verification" is just a method to > >increase trust in the calibration. If you use some homemade current > >target and a 500 MHz scope, you will get a pretty good picture of the > >waveform and detect most changes in an ESD generator. > > > >A comb-generator run on an OATS is not a NSA calibration, still it > >establishes trust in the antennas, cables and the spectrum analyzer. > > Quite right and sensible, but tell that to a UK metrologist! If it's not > 200% accurate, it's not believable.(;-) > -- > Regards, John Woodgate, OOO - Own Opinions Only. > http://www.jmwa.demon.co.uk > Interested in professional sound reinforcement and distribution? Then go > to > http://www.isce.org.uk > PLEASE do NOT copy news posts to me by E-MAIL! > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: davehe...@attbi.com > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > Archive is being moved, we will announce when it is back on-line. > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line:> > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: davehe...@attbi.com > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > Archive is being moved, we will announce when it is back on-line. > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
