ESD from flush mount rotating table. Floor mounted power receptacles were
cabled to avoid brush noise from power connections. Cables in the crawl space
under the raised floor, slide about as the turntable rotated, and the generated
a static charge on cable insulation. Discharges could be seen in the dark and
corresponded with received noise on SA.
The easy solution at the time was about a case of ladies anti-static spray used
to prevent dresses and panty hose from sticking together. Sprayed liberally
all around the cable area. It would last a year or more.
Low humidity was not an issue in south Florida, and there was still a static
problem.
On Thursday, May 12, 2022, 10:13:17 AM EDT, Paasche, Dieter
<[email protected]> wrote:
I dad that once, It was bad contact or loos contacts on the brushes to ground
in addition to very dry and not compliant humidity condition. In theory I think
you should have at least 30% humidity,
Sincerely,
Dieter Paasche
Senior Product Developer, Electrical
CHRISTIE
809 Wellington Street North
Kitchener, ON N2G 4Y7
Phone: 519-744-8005 ext.7211
www.christiedigital.com
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From: Paolo Roncone <[email protected]>
Sent: Wednesday, May 11, 2022 12:22 PM
To: [email protected]
Subject: [PSES] ESD generated by rotating turntable
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Hi everybody
we are considering doing radiated emissions scans during the turntable slow
rotation (about 5min/360deg) in a chamber with turntable flush on the metal
floor and sliding contacts.
The likely issue is ESD generated peaks coming from the sliding contacts.
Anyone has experience with this setup, and in that case, what kind of
mitigation techniques (if any) would be available?
I have direct experience with another chamber with a different kind of
turntable (not flush, , wooden structure raised about 20cm from the ground
plane) and have no issues in the 30MHz to 18GHz range.
Thanks in advance
Paolo
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http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used
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