Russell,
The margin issue is usually a much discussed subject when it comes to
initial product EMC emission certification. As most experienced EMC
engineers know that variances in production units will occur. Also to ensure
that if a production unit is tested in a different 'accredited lab' a
pro
There are two factors to take into account when determining the minimum
margin
for compliance with an EMC emissions limit.
The first is the level of uncertainty of the measurement. This number
should be
in your test report from your lab. If not, ask for that number. This is the
amount
that the p
: John Barnes [mailto:jrbar...@iglou.com]
Sent: Thursday, February 28, 2002 12:39 PM
To: emc-p...@majordomo.ieee.org
Subject: Re: EMC Emissions Safety Margins
Russell,
At IBM and Lexmark, our EMC department was comfortable if one unit
showed at least a 3dB margin between the measured emissions and the
Russell,
At IBM and Lexmark, our EMC department was comfortable if one unit
showed at least a 3dB margin between the measured emissions and the
specified test limits. If we were a little closer than that, and unable
to improve the margin for whatever reason, they would have us test two
more units
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