[SI-LIST] Re: Shielding Question

Craig,

I think there is no way to make the measurement one time using one set up as 
both channels should be measured at the same time, unless we use two 
identical differential pairs, one shielded, one without. Could you please 
tell us the correct answer?

Celine



>From: "Clewell, Craig" <Cclewell@xxxxxxxxxxxxx>
>Reply-To: Cclewell@xxxxxxxxxxxxx
>To: "'jain.nitin@xxxxxxxxx'" <jain.nitin@xxxxxxxxx>, si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Shielding Question
>Date: Tue, 20 Jun 2006 12:29:40 -0400
>
>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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