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From: Tom Sato
Subject: Re: ESD immunity - large chassis / enclosure redesign question.
Date: 15 Sep 2002 22:19:35 +0900
Organization: Nifty Serve
NNTP-Posting-Date: Sun, 15 Sep 2002 13:20:51 +0000 (UTC)
X-Newsreader: Gnus v5.3/Emacs 19.34
> 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 will be able to be withdrawn for servicing etc.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.
Although it would depends to some factors including structure of the
product (especially the structure around the removable section),
if finger strips can be used naturally, I suppose there is no reason
to reject the solution.
Bonding strap may not good for ESD when it can be long, and I think
it is not ideal for your situation anyway because it would be necessary
to remove the strap when removing the removable section.
Regardless of the bonding method, you may need to think of the route
of the possible ESD events, too, so that the ESD current would not
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