Because you're dealing with a relatively high frequency event, you really do need a good target and measurement system to verify that the waveform is in compliance....
That said, there are a number of ways to verify that the gun is working and is probably okay without going to any extremes. One way that is used by some is to make a simple resitive target (non-high frequency) that will allow you to look at the current waveform and get something that is repeateable. After the gun is calibrated and you are confident that the waveform is really correct - get waveforms --, you can then record the waveform you get with your homemade target. By comparing the waveform from the homemade target to what you got after calibration, you should be able to tell if there is a change in the gun -- it isn't likely there will be minor waveform variations that will cause the gun to go out of calibration -- more likely you'll see peaks that are not correct, no current, or peaks that are no longer controlled by adjusting the voltage level..... By the way, we're trying to get a statement into the next revision of 61000-4-2 to make it clear that it is not the users responsibility to calibrate the waveform before each test -- any simple method that allows you to determine that the gun is still working properly AND a valid calibration sticker, will be good enough for VERIFICATION! Good luck..... (Of course, you can always send it in for calibration -- you should do so yearly anyway.) Hope this helps, Best Regards, Michael Hopkins Thermo Electron [email protected] From: John Harrington [mailto:[email protected]] Sent: Thursday, May 01, 2003 2:46 PM To: '[email protected]' 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: [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] 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: [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] 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
