Steve, I have been doing the impedance modeling/testing for over 2
years now.  We started with a Polar, bought a TDR (only because a certain
customer wanted impedance results from a TDR and not the Polar), then we
upgraded to the new Polar CITS500S.
        IMHO, the Polar is the way to go.  It is extremely easy and faster
than the TDR, especially when testing differential impedance.  I have no
experience with the Introbotics so I can't compare their system to the
Polar.
        If you have any more questions just holler.

        Regards,
        John Anselmo
        Field Application Engineer
        Sanmina - Tech Center Austin

-----Original Message-----
From: Steve Underwood [mailto:[log in to unmask]]
Sent: Thursday, December 14, 2000 12:50 PM
To: [log in to unmask]
Subject: [TN] impedance testing... the question


Hello Technetters,

We are a small shop building primarily prototype quickturn commercial
and military medium technology product.

We use an impedance calculator from Polar and a tdr to verify impedance
on coupons from the same panel.  The coupons reflected the impedance
design with a 7 inch trace.  This has worked will for us.

Now we are at a point where we need to repair the tdr or move toward
another system of testing.
I've thought about Polar's CITS and the system from Introbotics...

The question...

What experiences has anyone had with the CITS and/or Introbotics versus
using a tdr?
What other methods are out there for verifying impedance on a printed
circuit board (bare board) in a manufacturing environment?

Any input is appreciated,

Thank you and have a Great Holiday!

Steve Underwood
Engineering Manager
Circuit Center, Inc.
937-435-2131 ext. 127
[log in to unmask]

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