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- Newsgroups: sci.electronics
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!caen!destroyer!cs.ubc.ca!uw-beaver!fluke!gtisqr!toddi
- From: toddi@mav.com (Todd Inch)
- Subject: Re: Static electricty problem
- Message-ID: <1992Dec17.212320.9560@mav.com>
- Organization: Maverick International Inc.
- References: <1992Dec10.001559.1608@miavx2.ham.muohio.edu>
- Date: Thu, 17 Dec 92 21:23:20 GMT
- Lines: 26
-
- In article <1992Dec10.001559.1608@miavx2.ham.muohio.edu> tgkreimer@miavx2.ham.muohio.edu (Tom Kreimer) writes:
-
- >Essentially, the operator would zap the metal lap
- >drawer under the laminated wood desk, and the keyboard, directly above the
- >drawer, would lock up. The monitor screen would also jump slightly, and the
- >computer would beep (probably related to the keyboard lock up. The CPU case
- >is back and to the left of the keyboard). Re-plugging the keyboard would
- >clear the problem, but how was it being affected? The desk drawer is
- >totally isolated from other metal parts of the desk and cables.
-
- All you need to do to solve the computer's problem is ground the drawer by
- running a wire (any type) from a screw in it's metal to the coverplate screw
- on any grounded AC recepticle.
-
- However, this will probably worsen the operator's problem: getting
- zapped. Spray for the carpet and anti-statick devices will dissipate
- the charge slowly before it builds up to the "big zap" point. The
- above solution will dissipate the big zap quickly, as your operators
- will tell you.
-
- I've always seen anti-static mats with a large (1 to 10 megohm)
- resistor in series with the ground source. You can buy a resistor for
- about $0.50 at radio shack, connect one wire to the plug screw and one
- to the wire to the drawer screw. This may (comments from others,
- please?) more slowly dissipate the charge, but is not necessary, at
- least for the hardware's sake.
-