My first memorable experience with ESD was at the age of 10. I would build
quite a charge on my body when playing
basketball in the gym. And I would always get a hugh zap when I pushed on
the metal handle of the water fountain. I
knew just enough physics to know that a rubber basketball was an insulator
so the next time I went to get a drink I used
the basketball to push on the handle and then bent over to get a
drink.....................well you know the rest. I still carry a
tiny scar on my lower lip to this day.
Bob Heller
3M Product Safety, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
==========================================================================================
"Gary McInturff"
<Gary.McInturff@worldwidepa To: "Chris Maxwell"
<chris.maxw...@nettest.com>
ckets.com> "Chris Chileshe"
<chris.chile...@ultronics.co.uk>
"emc-pstc"
<emc-p...@majordomo.ieee.org>
02/28/2002 11:31 AM cc:
brian_ku...@leco.com
Please respond to "Gary (bcc: Robert E.
Heller/US-Corporate/3M/US)
McInturff" Subject: RE: ESD
Generator confidence test (humor)
One other life lesson one I learned about ESD test areas. One should
always check that the drain wire is actually in place before on stands on
the ground plane and zaps the heck out of some equipment at 20 K or so. I
was trying to leave burn marks in the plastic housing to show me where the
arcs were actually penetrating the device. After a few smacks with the gun.
The whole ground plane was now elevated and when I leaned forward the table
height coincided with a very important, (at least to me) and well known
anatomical point so I got to be the ground path. I used much different
words, and volume levels that those of your technician and I don't
recommend the sensation to anyone.
Gary
-----Original Message-----
From: Chris Maxwell [mailto:chris.maxw...@nettest.com]
Sent: Thursday, February 28, 2002 7:05 AM
To: Chris Chileshe; emc-pstc
Cc: brian_ku...@leco.com
Subject: RE: ESD Generator confidence test (humor)
This brings up a good real life story.
I used to work with a technician (John) who helped with our in-house
compliance testing. One day, we were discussing the Horizontal
Coupling Plane (HCP) which has a 1MegaOhm drain wire to the Ground
Reference Plane (GRP).
His theory was that he could stand on the GRP and touch the HCP during a
discharge; and he wouldn't feel anything because of the drain wire.
I argued that the 1MegaOhm resistance was much higher than his body
resistance to ground; so he would get a very noticable "zap".
Our theoretical arguments went nowhere. We decided to experiment.
I have alot of respect for John; because he beleived strongly enough
that he volunteered to be the guinea pig. I set the ESD gun for 4KV and
hit the HCP. John's hands jumped from the HCP and he said something
like "oooh" or "ouch" (I can't remember exactly).
So, let that be a lesson to you guys out there. John already suffered
so that others may learn :-)
Chris Maxwell | Design Engineer - Optical Division
email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797
8024
NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA
web www.nettest.com | tel +1 315 797 4449 |
> -----Original Message-----
> From: Chris Chileshe [SMTP:chris.chile...@ultronics.co.uk]
> Sent: Thursday, February 28, 2002 7:41 AM
> To: 'emc-pstc'
> Cc: 'brian_ku...@leco.com'
> Subject: RE: ESD Generator confidence test (humor)
>
>
>
> Brian proposes a confidence test on ESD guns using colleagues..
>
> >> If the ESD gun is working properly, they will fall to the floor
> quivering
> >> slightly. Then they will wet their pants and forget who they are
> for
> >> about 25 to 30 minutes.
>
> A number of questions arise Brian..
>
> Is the order of events an essential part of the confidence test i.e.
> if they
> wet their pants *before* they fall to the floor, will the gun be
> deemed to
> have failed the test?
>
> Is there any useful information to be gained from the slight quiver,
> i.e.
> frequency, amplitude etc which might help with calibration of the
> discharge
> tip?
>
> Should the stop-watch be calibrated or would any wrist watch do,
> including the lab assistant's own?
>
> Has any such confidence test resulted in immediate vacancies in the
> engineering department, specifically, for a lab assistant.
>
> Can we extend this principal to confidence tests on surge equipment
> using middle management and members of the sales departments?
>
> Rgds
>
> - Chris
>
> -----Original Message-----
> From: brian_ku...@leco.com [SMTP:brian_ku...@leco.com]
> Sent: Tuesday, February 26, 2002 3:17 PM
> To: emc-p...@majordomo.ieee.org
> Subject: Re:RE: ESD Generator confidence test
>
>
> We also have come up with a simple way to test our ESD gun, but it
> requires the
> help from our lab assistant (lab managers work good too).
>
> First, have them take off their shoes and socks and stand on the
> Ground
> Reference Plan. Have them wet their fingers and grab the end of the
> ESD gun. Crank up the gun to 16.5KV single shot and let them have it.
>
> If the ESD gun is working properly, they will fall to the floor
> quivering
> slightly. Then they will wet their pants and forget who they are for
> about 25 to
> 30 minutes.
>
> Keep in mind that this method is not yet approved by A2LA or NAVLAP.
>
> Have fun,
> Brian
>
> -------------------------------------------
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