Dave wrote:
Back about 1981, we had piles of 6502s, etc and decide to some
"antistatic testing". We put a 40pin ZIF socket into a VIC-20, and
then set about trying to fry the uP using carpet, a cat, car seats,
etc. The DUT was then put back into the VIC and series of tests run
to verify operation. I don't think we ever had a failure. Of course,
there may have been some hiding that we missed, but all the static
damage I've seen has been pretty severe.
That said, I always use a wrist strap and mat if I'm working on
something I don't want to break further.
Installed components are generally much less vulnerable to ESD than
bare parts, because there are leakage paths (both intentional and
otherwise) on a circuit board that allow the ESD to flow around the
component rather than through it. With a naked part, any ESD to one
of its leads has to flow through its other leads or the case of the
device, thereby maximizing any damage.
Best regards,
Charles
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