Funny you should mention that. We had the same problem only it turned out
to be an access plate in our turntable.
Even though the plate is screwed into the turntable, over time the screws
loosen enough through vibrations and
the plate starts arcing. Like all great inventions, we accidentally found
this out during our troubleshooting by making
a scan with the access plate removed. The plate is now a permanent part of
our turntable preventive maintenance
schedule.
Bob Heller
3M Product Safety, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
=====================================================================================
----- Forwarded by Robert E. Heller/US-Corporate/3M/US on 03/20/2002 12:14
PM -----
Hans Mellberg
<emcconsultant@ To: David Spencer
<[email protected]>
yahoo.com> "'Arno van Kesteren '"
<[email protected]>
"'[email protected] '"
<[email protected]>
03/20/2002 cc: (bcc: Robert E.
Heller/US-Corporate/3M/US)
10:31 AM Subject: RE: Earthing of
conductive floor tiles
Please respond
to Hans
Mellberg
Several years ago I was called in to debug a chamber that had spurious
emissions
whilst turning the table. Naturally, everyone accused the tt manufacturer
but after
several hours of frustrating dead ends, it turned out that the small amount
of
vibration caused by the tt was causing the floor tiles to move and shift
ever so
slightly. This was enough for small amounts of static charge to develop and
discharge causing the emissions in the chamber. Once this was ascertained,
grounding
the floor tiles eliminated the problem. We used copper tape under every
tile folded
over till the tile manufacturer came in with a permanent solution which
included
spring fingers. These metal lined tiles were for a false raised floor for
cabling
and a/c and not the ferrite types.
--- David Spencer <[email protected]> wrote:
>
> Hi Arno,
> John gave you the short answer...the MFG should have installation
> instructions. In all of the installation I have been party, there is a
grid
> of copper tape laid down in the conductive adhesive. This keeps the
> adhesive from getting excessively resistive over large areas. Surface
> resistance tests run anywhere from 100k-400k ohms when it's all done.
Note
> that if you are installing relay racks or metal benches that you can run
> into ground loops.
> Have a Great Day,
> Dave Spencer
> Oresis Communications
>
>
> -----Original Message-----
> From: Arno van Kesteren
> To: Arno van Kesteren; [email protected]
> Sent: 3/18/02 1:48 PM
> Subject: Earthing of conductive floor tiles
>
>
> Dear Group,
>
> Do conductive tiles in floors for ESD prevention have to be connected
> together (e.g. through a low impedance earth bond) ?
>
> Arno van Kesteren
> ESO
> Munich, Germany
> e-mail: [email protected]
>
>
>
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Best Regards
Hans Mellberg
Regulatory Compliance & EMC Design Services Consultant
By the Pacific Coast next to Silicon Valley,
Santa Cruz, CA, USA
408-507-9694
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