After listening to this thread, it brings up a question that I have had
over the years regarding limit lines
and passing margins.

Are there "EMI guard bands" already built into the limit lines?

I find it very difficult to believe that a group of reasonable people
developing a limit line would have
determined that they had thought of every possible EMI interference issue
and would not have built a
"safety margin" into that limit.

Does anyone have any historical development data or insights into the
creation of limits?

Bob Heller
3M Product Safety, 76-1-01
St. Paul, MN 55107-1208
Tel:  651- 778-6336
Fax:  651-778-6252



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