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November 2008

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Tue, 18 Nov 2008 12:05:26 -0600
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text/plain
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True ESD shelving has a dissipative coating on it. Purely metal shelving
can be construed to be ESD shelving, provided that the only product
stored on it is in Faraday cages that will dissipate any charge to the
shelving. Having unprotected ESD assemblies sitting directly on a metal
shelf that is connected directly to ground does not constitute
protection. Metal shelves without benefit of dissipative coating should
be connected to ground through a 1 meg resistor. This prevents a direct
charge from going through the assembly, whether from ground to a
positively charged person or object, or vice-versa.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Dixon
Sent: Tuesday, November 18, 2008 11:10 AM
To: [log in to unmask]
Subject: [TN] ESD Shelving Question

Hi Gurus,
    We just noticed that our supposed ESD shelving has a clear thin
insulative coating on it.  The grounding clamps bite into this coating,
and if you poke a probe through the coating, you can see that the
shelves are connected to ground.  This runs against all my beliefs about
shelving materials.  Shouldn't they be conductive on the shelves'
surface area as well?
    Thanks in advance for any input!
 
Dave Dixon
Engineering Technician
Aero-Mach Labs Inc.

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