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Subject: ESD immunity - large chassis / enclosure redesign question.
Date: Sat, 14 Sep 2002 14:06:14 +0800
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
We are reworking a large product to make it more serviceable. We are
remodeling the chassis (approximately 2m x 1m) so that a section (1m x 1m)
will be able to be withdrawn for servicing etc. The structure is a steel
frame with powder coated metal covers. During compliance testing we had
quite a challenge to pass the ESD tests.
I am trying to determine the best way to couple the removable section to the
main chassis to optimise ESD immunity yet be easily and simply disconnected
for the withdrawal. An important constraint is that the unit that is
'wheeled out' cannot be tightly (mechanically) coupled to the main chassis.
I have a few ideas each with their own short comings:
1) A flexible metallic coated bonding strip between the two units.
2) A series of wide braided earth straps.
3) Beryllium/copper finger strips between the units contacting against
alodined aluminium strips.
Has anyone solved a similar problem or seen any neat solutions in similar
thanks for any ideas
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