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
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