----- Original Message ----- From: Jim Ericson <[email protected]> To: <[email protected]>; <[email protected]> Cc: Harry Hodes <[email protected]>; James Ericson <[email protected]> Sent: Monday, February 25, 2002 2:46 PM Subject: Re: ESD Generator confidence test
> Hello Vic! > > Verification of the 61000-4-2 ESD waveform requires some careful > engineering, no matter which approach you take. Basically, you need to > verify (among other things) the front-edge risetime, which is at (or > slightly below) 1 nanosecond. The harmonic content of the RF produced by an > ESD pulse is largely dependent on the pulse risetime. > > To seriously verify this risetime, you need precise fixturing (i.e., the > Pelligrini Target described in the 61000-4-2 Standard), plus a 1 GHz > oscilloscope, a Faraday Cage, and plenty of attention to setup conditions > ... including physical placement of the Generator ground strap. I don't > believe there is a "simple" way to do it. > > To verify our Generators (Haefely-Trench models), I built the Pelligrini > Target described in the Standard. It is quite an exercise in precision > machining of brass, learning how to electroplate Silver, etc. If you don't > have access to a lathe, vertical milling machine, drill press, and > chemicals, you can doubtless find a local machinist that will tackle this > thing. I built our target for approximately $200 US. A commercial target > costs upwards of $2000. Plus calibration. We paid Haefely to run an A-B > comparison calibration with their standard target, and the results were very > close. Now, we use that data (and our target) to verify our ESD Generators > between "formal" annual calibrations by the manufacturer. > > Give me a call if you would like any details on our target. 1-888-226-3837. > > Regards, > > Jim Ericson > Senior EMC Engineer > Acme Testing Company > [email protected] > > > > ----- Original Message ----- > From: <[email protected]> > To: <[email protected]> > Sent: Monday, February 25, 2002 6:00 AM > Subject: ESD Generator confidence test > > > > > > The ESD standard IEC 61000-4-2 gives details for the manufacture of a > > current target, used for verifying the ESD waveform. > > > > I appreciate this could be used as a confidence check before administering > > the test, but does anyone have another approach that they would be willing > > to share. > > > > Many thanks > > > > Vic Gibling > > > > EMC Engineer > > > > Raytheon Systems Limited > > > > > > ------------------------------------------- > > 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"
