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. Then if all three units had over 1.5dB margin they would
pass us, but might require us to retest production units quarterly or
after every significant hardware/software-design change.
They also asked us to be up-front with them, and to show them our
pre-approval runs to prove that these measured emission peaks did not
change much run-to-run.
John Barnes
dBi Corporation
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