Dear John, It depends on what you want.
But at first we need to discuss one issue of definition of "verificaiton", "calibration" or all kinds of similar words. I define a "calibration" as a traceble measurement and a "verification" as a measurement that helps to establish confidence that some instrument is still OK. A "verification" by this definition is not traceble. In EMC, using a comb-generator daily to check you emissions equipment (antenna + amp + cable + SA) is a verification. 1) If you are going to do a formal calibration, you have to follow the standard and have to have a bandwidth of at least 1 GHz. 2) If you are just doing a verification, you can build your own current target, even if it only works so and so. Then you take some oscilloscope, e.g., 500 MHz bandwidth and do a reference measurement after the ESD generator has been "calibrated" (see above for definition). From that day on, you dischare the generator into your self-made structure and compare to the reference. Now you need to derive some useful criteria to handle diviations. But in general, your aim is just to establish more confidence in the ESD generator's calibration status. So your measurement do not need to capture all parameters in good fidelity. Of course, you have to do your traceble calibration, e.g., every year or so. The present ESD standard is not very clear in the use of "verification" and "calibration". But the definitions above are the ones that TC77b-WG-9 intended. The new version of the standard, that is in a CDV stage, clarifies this better. David Pommerenke University Missouri Rolla From: John Harrington [mailto:jharring...@f2labs.com] Sent: Thursday, May 01, 2003 1:46 PM To: 'emc-p...@majordomo.ieee.org' Subject: ESD gun verification Hello All Does any one have a quick and dirty (and hopefully cheap) way to verify the performance of an ESD gun. Please, no one suggest building the current sensing system described in the back of IEC 61000-4-2. I don't understand the drawings let alone have the workshop or materials to consider it. Although, I may pay someone to build it for me... I am desperate enough to consider buying something off the shelf (if I could find said shelf). All help appreciated John Harrington EMC Technical Manager F-Squared Laboratories 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
