Muriel,
You asked for comments on your CONDUCTED emissions testing procedure in
a presence of ambient noise.
Provide clean ac power to LISN. Either have "clean" ac power generator
or insert 10 kHz low pass
filter between ac power line and LISN. In addition, add common mode
filter as already commented.
Method you suggested is not acceptable for final
compliance measurements.
> i record
> the signal with the product tested at "off" and when i
turn the product
> "on", i subtract the signal of "on" minus the signal
of "off". this
> means that i subtract the "ambient noise" from the
noise being generated
> by the product itself.
Test method might be useful during engineering work, in
which case you
are allowed to use any test method you want.
Mirko Matejic
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