I use the CATC model HBP USB production tester from Computer Access
Technology Corp. Check them out at http://www.catc.com/. It's relatively
inexpensive. But I'll warn you in advance. I had to filter the DC power port
on the device in order to quiet the radiated emissions. Other than that, its a
very
nice piece of hardware. The software will allow you to run a quick pass from
the DOS environment, something important to us so that we can power-cycle
efficiently.
Carl Newton
From: [email protected] on 12/22/99 03:18 AM
Please respond to [email protected]
To: [email protected]
cc: (bcc: Carl Newton/XYCOM)
Subject: Emission testing of PC with USB connector
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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