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December 2001

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Subject:
From:
Genny Gibbard <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 10 Dec 2001 16:41:11 -0600
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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...

Thanks.

-----Original Message-----
From: Sauer, Steven T. [mailto:[log in to unmask]]
Sent: December 10, 2001 3:18 PM
To: [log in to unmask]
Subject: Re: [TN] RF shielding


Hi Genny,
To further the info from Phil, here's some info regarding the copper
screening material:  http://www.twpinc.com/rfi.html
You can make a screen cage with 2x4's, mesh, lag bolts and washers.  The
critical thing would be to ensure that the washer completely covers the hole
made in the screen for the lag bolt to pass through.  One side note, the
cage doesn't need to be grounded, it should be isolated.
There are some commercially available products that may fit your needs, such
as a portable "tent" that is made of aluminum poles and EMI shielded
material.  If I can find that information, I'll pass it along later....
Good Luck.

Steve Sauer
Mfg Engineer
Xetron Corporation

-----Original Message-----
From: Phil Nutting [mailto:[log in to unmask]]
You could try copper window screen material....
I seen this successfully used for a high voltage faraday cage and it is also
used on our EMC compliance test room.

Phil Nutting

-----Original Message-----
From: Genny Gibbard [mailto:[log in to unmask]]
Looking for ideas - preferably more along the lines of homemade basket
idea..... RF screen or something that we can mount and ground between the
benches to reduce what we call 'crosstalk'.

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