One cannot take responsibility for customer supplied equipment unless he
controls what the customer buys. I am not at all certain saying
"certification is void if used with noncompiant power sources" is good
enough legally -- and we know it's not *factually* given CE + CE ?CE.
Cortland Richmond
On 6/16/2012 1611, John Woodgate wrote:
In message <D038C885075E4234912D119506A574CB@christopher>, dated Sat,
16 Jun 2012, Chris Wells <[email protected]> writes:
I have a 24VDC powered device that needs to meet CISPR 11. We planned
to recommend a particular class B power supply with this device.
However the noise from our device appears to be pushing through the
power supply and limiting the combo to class A. The problem area is
in the 5-30 MHz. range.
Strictly, if you are not supplying the power supply, just recommending
it, then to the letter of the EMC Directive you are not responsible
for its emissions, even when connected to your product. But I think
many people would say that was cheating.
If your DC input is pushing out enough hash to cause the power
supply's emissions to be too high, I think you do have to quieten the
DC input, regardless of what any standard says. Standards can't
necessarily explicitly cover every possible situation.
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