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Subject:	Re: RF shielding
From:	"Sauer, Steven T." <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Tue, 11 Dec 2001 08:04:59 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (40 lines)

Good Morning Genny,
In simple terms, if you ground the cage then it's no longer isolated.  If
each test station is grounded then the test stations are electrically
connected and suspect to ground transients (talk about spurious output
problems).  Think of safety first, if you're using an RF PA that arcs to the
grounded cage, what happens?  Do you ground ESD bags?
Keep it simple, if you select the appropriate mesh, based on your frequency
and power, there won't be any bouncing or reflecting, just simple
absorption.

-----Original Message-----
From: Genny Gibbard [mailto:[log in to unmask]]
Sent: Monday, December 10, 2001 5:41 PM
To: [log in to unmask]
Subject: Re: [TN] RF shielding


Pardon me, but I'm not sure I understand why the cage should be isolated
instead of grounded.  Wouldn't 'grounding' the cage provide better
'isolation' from test station to test station, instead of just bouncing or
reflecting the signal, like I imagine an isolated cage would do?

Currently we avoid crosstalk by planning what test stations are placed
where, so that we don't put unshielded tests nearby critical spurious tests
on another product line, for example.  But as we get crowded, waiting for
our new 'triple the size' production facility to be ready, we are running
out of room to space our test stations adequately.  In our new building,
there will be no competing product line test benches backing on to each
other - they will just have to worry about the ones to either side...

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