:57:16 MsgID: 1072-33989 ToID: 72146,373
From: d...@dsmith.org INTERNET:d...@dsmith.org
Subj: Re: Shielding Effectiveness - or when a dB is not a dB
Chrg: $0.00 Imp: Norm Sens: StdReceipt: NoParts: 1
List-Post: emc-pstc@listserv.ieee.org
Date: Tue, 01 Aug 2000 06:58:47 -0700
From
I have successfully used small loops for performing shielding
effectiveness measurements. They are ideal to locate weak spots or points
in a seam or isolate the leakage from aperture areas. We then compared
these readings to a final shielding effectiveness measurement for the entire
chassis and
I have been using plane shielded loops for over 15 years. Small magnetic
loops allow localizing defects to small areas and use of small samples. I
don't claim objective figures, but by comparing the material under test to
a known good shield (i.e.: galvanized iron sheet) and to air, one gets a
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