Hello,

I would ask for some information about Emission testing of a desk top PC with a 
USB bus.
In the standards (EN55022 and FCC/ANSI C63.4) is given a PC test set-up and the 
explanation that on all on connections a device must be connected in normal 
use. 
My question is how must be tested a PC with USB connections. I could imagine 
that a passive USB device (for instance a mouse) is connected to one USB port.  
But is this according the EMC standard, because on a USB bus can go 
communication signals till 12 
Mbps or even more and this has of course influence on the EMC emission 
behaviour of the PC set-up. 
Which (black box) USB device could be use as a standard USB device for EMC 
emission measurements.

Thanks in advance.
Jan Mobers


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