My purpose was solely to research the rationale (which I should have found on my own in my 1995 copy, but didn¹t until the 2008 wording was presented). For my immediate purpose, the official rationale suffices.
Ken Javor Phone: (256) 650-5261 From: John Woodgate <j...@woodjohn.uk> Reply-To: John Woodgate <j...@woodjohn.uk> Date: Tue, 19 Jun 2018 22:14:46 +0100 To: <EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] ESD question Yes, that's what Annex A says, but it's still a stone tablet. 'determined', 'shown'; by whom? when? I'm not attacking the committee, because it may well be impossible to do better. But we should understand what sort of information or data we are using. I have been known to liken most of EMC testing to 'measuring jelly (Jello) with a micrometer'. 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 22:05, Ken Javor wrote: > Re: [PSES] ESD question Thank you! > > Ken Javor > Phone: (256) 650-5261 > > > > > > From: "Schaefer, David" <david.schae...@tuvsud.com> > <mailto:david.schae...@tuvsud.com> > Date: Tue, 19 Jun 2018 20:56:57 +0000 > To: Ken Javor <ken.ja...@emccompliance.com> > <mailto:ken.ja...@emccompliance.com> , "EMC-PSTC@LISTSERV.IEEE.ORG" > <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> <EMC-PSTC@LISTSERV.IEEE.ORG> > <mailto:EMC-PSTC@LISTSERV.IEEE.ORG> > Conversation: [PSES] ESD question > Subject: RE: [PSES] ESD question > > Ken, > > Annex A in the 2008 edition has this to say: > > A.7 Selection of elements for the ESD generator > A storage capacitance shall be used which is representative of the > capacitance of the human > body. A typical value of 150 pF has been determined suitable for this > purpose. > A resistance of 330 Ohms has been chosen to represent the source resistance > of a human body > holding a metallic object such as a key or tool. It has been shown that this > metal discharge > situation is sufficiently severe to represent all human discharges in the > field. > > - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> 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) <http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher <j.bac...@ieee.org> David Heald <dhe...@gmail.com> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> 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 <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
