As I recall, when contact discharge was first required (a FEW years ago!),
digging in the contact adaptor point was mandatory on surface coatings
covering conductive materials UNLESS the coating was in fact designed as an
insulator against this hazard.
I don't use those standards where I work now, and what I remember was probably
changed, obscured or ignored in later revisions anyway.
Cortland RIchmond
GE Aviation
(Opinions my own and do not reflect my employer's)
----- Original Message -----
From: Scott Douglas <mailto:[email protected]>
To: Philo Beddo <mailto:[email protected]>
Cc: [email protected]
Sent: 5/22/2009 9:56:00 PM
Subject: Re: [PSES] ESD testing
Yes, paints are usually (but not always insulative). But when doing ESD
testing a guy at a lab once told me they dig the point in through the paint
because in the real world there will be scratches through the paint and that
is where ESD will get in.
My own practice for the past (too many to recall) years has always been
dig
in the point on metal / conductive surfaces. We have also done contact
discharge to plastic surfaces such as control panels and displays because that
is where people will touch the product, though for that test we won't dig in
the point. Then we do air discharge on plastic surfaces, but tend to have the
approach start over plastic surfaces, then repeat with the approach over metal
surfaces heading toward the plastic. Found lots of leakage at the interfaces
between the two materials that way.
[email protected]>
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