22 May
1999
22 May
'99
10:25 a.m.
Seems to me like last time I took one of the classes leading to "ESD
Certification" the standard resistance for "primary packaging," which is
what encloses and otherwise directly contacts the packaged items, was 1
MegOhm per inch. That is high enough resistance that you can't hurt
yourself with inadvertent contact with the AC mains, yet low enough to
dissipate static from the usual sources with little risk to the components.
Dick
-----Original Message-----
From: Tony Duell <ard(a)p850ug1.demon.co.uk>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Saturday, May 22, 1999 4:31 PM
Subject: Re: Northstar Horizon Update
would
> Um... I
thought that anti-static foam was conductive? Wouldn't that
> be bad? Maybe I'm wrong.
[...]
> yeah, I thought anti-static foam was made from carbon specifically so it conduct static
charges away.
I've just taken a piece of such foam and stuck my ohmmeter probes in it,
about 0.1" apart. The resistance was about 5-10M. I don't think there's
much chance of that shorting out a TTL signal.
-tony