Hi Group,

I really having a hard time getting my 120VDC motor to meet the 48dbuV
conducted emission requirements for FCC.

I connected a light dimmer to the LISN and observed that it was just as bad
as the DC motor.  Since the DC motor is part of the over all system, which
includes a microcontroller, and the dimmer is just a triac circuit.  How come
we have to meet the class B and it (dimmer) does not?

I put in common and differenital mode chokes, that helps but does not
completely fix the problem.  Also tried chassis caps and such.

Anyone have any suggestions?

Thanks,

Paul

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