Scott,
Last year, CENELEC attempted to formalize a common practice for
measurement uncertainty (prEN50222). It failed.
In November 1997, during the CISPR/A meeting a decision was made to
issue a new international Committee Draft (CD) on this issue. I have
not seen an actual draft number, but from what I have read, the new CD
will describe a "reasonable" measurement of uncertainty of +/- 3dB for
conducted and +/- 5.5dB for radiated.
Regards
Joe Martin
EMC/Product Safety Engineer
P.E. Biosystems
[email protected]
______________________________ Reply Separator _________________________________
Subject: Required Margin for EMI?
Author: [email protected] (Scott Douglas) at fcinternet
List-Post: [email protected]
Date: 10/26/98 12:50 PM
Hello all,
When doing EMI scans of ITE, I have always worked with a margin of 2 dB
less than the actual limit. No test house I have ever been to will give a
"meets the requirements..." without having this margin. Can anyone point
out if this is an actual requirement built into any of the standards, i.e.
EN 55022 or FCC Part 15, etc. and if so, where is it in writing?
I understand about measurement errors, product to product differences and
repeatability of testing issues. Just want to know if the 2dB margin is
actually written into law.
Thanks for your comments.
Scott
[email protected]
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