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 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] Subject: Re: [PSES] ESD question This message originated outside of DISH and was sent by: [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]> Date: Tue, 19 Jun 2018 21:26:38 +0100 To: Ken Javor <[email protected]>, <[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> 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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