[SI-LIST] Shielding Question

I have polled a couple of colleagues, but wanted to throw this out the list
just to see what kind of feedback it would generate.

If you have a shielded differential pair and you need to test the shielding
effectiveness how do you go about setting up the differential pair?  I
realize in a coax scenario this would be pretty straight forward, but for
the differential pair I'm a little confused and here is why.

You send a signal into the chamber via an antenna.  You have a reference
antenna hooked up and you also have the DUT hooked up.  However, how do
you connect the differential pair?  Do you measure the SE of each line
individually, and ground the other leg of the diff pair on the far end,
while terminating on the near end of the quite line?  Do you measure both
channels of the diff pair at the same time as a sort of common mode
configuration?

I know that one way of doing this would be to make 2 measurements; one with
the shield and one without, but is there a way to make the measurement one
time using one set up?

Thanks for your insight, 

Craig


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