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Date: | Tue, 9 Apr 1996 08:28:16 +0400 (EDT) |
Content-Type: | TEXT/PLAIN |
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I take it that the impedance measurements are being done on printed
circuit boards. I have been looking into the question of such
measurements recently.
Here at Compunetics I have an HP 54120 scope and associated 4 channel
test set. I recently got several mounting jacks from M/A Com, part
number 2062-0000-000, that offer a 50-ohm connection to the appropriate
mounting holes on a board. I expect these jacks to work well with a
suitable coupon on the board edge. They certainly seem sturdy enough.
They can be screwed into a 50-ohm cable from the test set. I also plan
on terminating the coupon with a 50-ohm jack and a 50-ohm termination to
get rid of reflections there.
IPC-TM-650, method 2.5.5.7, may be of some help. It is where I got the
M/A Com part number.
According to Alson Wong at Hewlett-Packard, not having a 75-ohm connector
should not create a big problem if your test set is 50-ohms. I can't
speak from experience. If you want to call him, Alson's number is
800-452-4844. He is in Colorado.
How do I find out more about the Polar instruments? Do you have an
address or phone number?
Louis Hart
[log in to unmask]
.
On Mon, 8 Apr 1996, ppannu wrote:
>
>
> We are using couple of Polar CITS 200, to measure impedance of our
> product. These are truly wonderful machines intended for
> manufacturing environment. The problem we are having is the test
> probes, they are so fragile and have very short life, and the
> replacement is about $400 a piece.
>
> Has anybody looked at or found more robust probes for these testers?
> The company looking into new design, but nothing to offer yet.
>
> Also, the company supply a IP-75 ohm and a IP-100 ohm Probes, in
> addition IP-50. Do these IP-75 and IP-100 really make difference
> in test results?
>
> Thanks, in advance
>
> Zycon Corp.
> [log in to unmask]
>
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