My bet's on capacitance ---- Interesting thread --- kinda like déjà vu -- all these same conversations went on back in the mid 80's. Back then, there were lot's of specifications for ESD --- everyone had their own idea of what the capacitance and resistance values should be for a human discharge, with or without metal attached...... This settled into the IEC 801-2 values over time...., but meanwhile, gun manufacturers made every version of discharge network known to man, from 20pf to 1000pf and from 0 ohms to 5k ohms....
IBM had a special tester (it was a secret at the time), that did high repetition rate testing and was coupled to radiating planes.... Wild stuff... I think they may still have some they'd sell cheap.... The Andy Hisch gun was very popular, and a lot of corporate standards were written around it, inlcuding those for companies like DEC and HP --- International standards took over eventually and the standardization began, which eventually forced most to the IEC model; however, other standards still exist -- most importantly for automotive and military..... Not to mention device level testing that uses even different models..... My 2 cents..... Best Regards, Michael Hopkins Manager, Customer Technical Center Process Instruments Division Thermo Electron Corporation One Lowell Research Center Lowell, MA 01852 Tel: +1 978 935 9334 Direct +1 978 275 0800 Main +1 603 765 3736 Mobile michael.hopk...@thermo.com www.thermo.com/esd From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of John Woodgate Sent: Thursday, June 22, 2006 1:39 PM To: emc-p...@ieee.org Subject: Re: 1500 ohms 100 pF gun? In message <000801c69620$35d095e0$150bb...@colorado.linear.com>, dated Thu, 22 Jun 2006, David Cuthbert <dcuthb...@linear.com> writes >The return path for the charge (from the floating person) must be >through displacement current. Oh, it IS magic, then. (;-) -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk 2006 is YMMVI- Your mileage may vary immensely. John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc