Re: (OT) - Static electricity grounding device?
On Tue, 27 Mar 2001, Robert Waldner wrote:
> >A well built computer should connect all the metal case parts directly to
> >the ground prong on the outlet, so to dissipate static it is usually
> >sufficient to touch metal on a computer.
> Out of experience this isn´t always the case, but the power supply
> itself is always grounded, so touch the _power supply_ to be on the
> safe side, not just any metal.
Anyway, w.r.t. static, the important thing is not being at ground
potential (whatever that means) but having all parts at the *same*
potential. Touching bare metal in the case or chassis (the power supply
is a good choice) will bring your body to the same potential as that of
the parts in the computer. Laying sensitive parts in a similar position,
while still in the antistatic packaging, should do the same for
I've heard advice that you should do this with the mains power
*dis*connected, and on reflection that's excellent advice. That way you
take care of high-voltage low-current static charges, and avoid the
lower-voltage high-current mains that can kill you.
Plus, you could pick up an inexpensive antistatic wrist strap for just a
few dollars. If you do a lot of work inside computer cases, it's a
worthwhile investment. Outfits like Jensen Tools have wrist straps,
antistatic floor mats and benchtoppers, toe/heel straps, you name it.
Mark H. Wood, Lead System Programmer mwood@IUPUI.Edu
Make a good day.