Somewhere, I have copies of the discharge waveforms (captured on a scope) from human subjects that Michael King recruited during his studies. As I recall, the amplitude of the ESD pulses was limited to about 10kV as the subjects started to balk.
I believe Michael’s studies also led to the development of the Andy Hish 255 probe. The waveform from that probe, which was a long wand grasped in the hand, was influenced by the human body capacitance of the technician performing the tests. There was a situation some years ago in our EMC Lab, where my associate and I both consistently passed a product for ESD using the Andy Hish probe, which was our corporate standard tester at the time. However, an intern working with us consistently failed the product. We did our best to make sure we were all following the exact same test technique. The only difference my associate and I could think of was that the intern was of a different ethnicity than us. We didn’t dare mention that, however. Jim Hulbert From: Doug Smith [mailto:[email protected]] Sent: Tuesday, June 19, 2018 7:07 PM To: [email protected] Subject: Re: [PSES] ESD question Hi Chas, I think at the time Michael King was developing the data for modern standards on ESD, David Pommerenke was likely just starting kindergarten. David came around much later, even later than the extensive work at Bell Labs I participated in characterizing simulators of the time. The model of the simulator predates David's work by many years as far as I know. Doug [https://hostingemail.xo.com/api/storage/[email protected]/signatures/images/2476c205-f457-4395-87cc-7aa199c734f2] On Tue, 19 Jun 2018 21:08:16 +0000, "Grasso, Charles" wrote: Ken, The gun model is derived from extensive research by Mike King and others (David Pommerenke) to derive a pulse that reflects an ESD event from a human with an intervening metal object. I have copied Mike for his input. Dr Pommerenke is on the EMC blog. Thanks Charles Grasso (w) 303-706-5467 From: Ken Javor [mailto:[email protected]] Sent: Tuesday, June 19, 2018 2:35 PM To: [email protected]<mailto:[email protected]> Subject: Re: [PSES] ESD question This message originated outside of DISH and was sent by: [email protected]<mailto:[email protected]> What with Doug Smith being active in this sort of standard writing activity, I doubt it’s simply inertia. Ken Javor Phone: (256) 650-5261 ________________________________ From: John Woodgate <[email protected]<mailto:[email protected]>> Date: Tue, 19 Jun 2018 21:26:38 +0100 To: Ken Javor <[email protected]<mailto:[email protected]>>, <[email protected]<mailto:[email protected]>> Subject: Re: [PSES] ESD question Probably handed down on a stone tablet in 1910 and no-one had the courage to challenge it yet. (;-) John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk<http://www.woodjohn.uk> <http://www.woodjohn.uk><http://www.woodjohn.uk> Rayleigh, Essex UK On 2018-06-19 21:18, Ken Javor wrote: ESD question Anyone out there know the origins of the 150 pF/330 ohm gun model used in EN61000-4-2 and derivative standards? It seems it ought to be a human body model, but it isn't. Ken Javor Phone: (256) 650-5261 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
