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Conducted emissions CISPR 22 power output
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dpape:
Hello,

I'm finishing the design of a linux board which contains various peripherals (USB, Ethernet, ...)
and I'm now doing some pre-compliance conducted emissions testing on the workbench. This
is a telecomunications product for the EU so I'm using the CISPR22 standard for conducted
emissions.

The board is fed with 5VDC power input but also has a 12VDC @ 500mA power output (DC DC step-up).
I'm now not sure how I'm supposed to connect the LISN and which maximum levels to use. I don't
feel that this is a 'telecommunications port' but I don't think this is a 'mains' terminal either.

Can anybody shed some light on this?

Kind regards,
Daan
T3sl4co1l:
What would connect to it?  Is it, say, replacing an external wall-wart or something?

Tim
dpape:
The 12V power output will supply power to one of the peripherals of the DUT. For
example a ticket printer wich needs 12V input.
T3sl4co1l:
Then I would guess it counts as another comm pair, since it's in a loop with them.

If you specify a type of e.g. ticket printer, of known cable length and placement, then you can say "all of this is my equipment" and test it as a whole.  But that's a no-no if it's unknown cable length and such.

Tim
dpape:
Hi Tim,


Thank you for the reply. The type of ticket printer and cable length is unknown. I'll just test it with the 5 uH LISN just as it would be a comm port.

Kind regards,
Daan
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