Ken et al,
I think the query was just the opposite. The tabletop is wooden, but do the
legs need to be wooden as wel? The FCC paradigm (AFAIK) places the test
sample 80 cm above ground, thus limiting parasitic capacity. My gut response is
they should be fine with metal legs, as long as the tabletop is thick enough to
limit stray capacity. If one had OCD tendencies, one could measure the capacity
between a piece of metal laid on the tabletop and the ground plane, and as long
as the capacity were suitably low (single-digit picofarads?) that would suffice.
--
Ken Javor
(256) 650-5261
From: Ken Wyatt <k...@emc-seminars.com>
Reply-To: Ken Wyatt <k...@emc-seminars.com>
Date: Thursday, December 28, 2023 at 3:53 PM
To: <EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: Re: [PSES] Metallic table for conducted emissions?
Hi Brian,
The answer is yes and no. Yes, you can get a general idea, but no, you really
need a ground plane to conduct the CM currents back to the LISN, which needs to
be bonded to the plane. Just find a metal supply store and buy enough aluminum
to cover one of your benches. In a pinch, and for quick troubleshooting, I just
tape down heavy duty aluminum foil and copper tape the LISN to the foil.
You’ll see examples of the technique in my Volume 2, Chapter 3 of the trilogy.
Cheers, Ken
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On Dec 28, 2023, at 2:13 PM, Brian Gregory <brian_greg...@netzero.net> wrote:
Hello fellow experts,
we're looking to build a conducted emission pre-compliance test station to FCC
Part 15 Subpart B requirements (residential applications).
Is a non-metallic table a necessity for reasonable accuracy?
We have a number of lab benches with wood tops and metal legs that would fit
far better than jamming an all wooden, non-folding table into our modest space.
thanks all and Happy New Year,
Colorado Brian
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