On Tue, 27 Mar 2001, Robert Waldner wrote: [snip] > >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 them. 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 [EMAIL PROTECTED] Make a good day.
