Steve:
The biggest reason is that all of our board sources are off-shore. We're
more than a little concerned that data from some of our offshore sources
may not be viable. What we thought about doing is having the offshore
facility perform TDR during initial qualification. We would get the
companion board from the panel (ours are mostly 2-up panelizations) & do
TDR here and try to correlate between us and the them. Then, if there
was a problem in the future, we can respond from stateside rather than
the less urgent route of going back offshore.

What we're having to do is buy proto's from a local source just to get
them to do TDR on all of our suppliers- this is aceepatble to them on a
short term basis, but isn't a long term solution...

Thanks again Steve...

Best regards,
Bill

-----Original Message-----
From: Joy, Stephen C [mailto:[log in to unmask]]
Sent: Wednesday, December 02, 1998 3:14 PM
To: "[log in to unmask]" ; "Bill Davis" 
Subject: RE: [TN] TDR Testing


Bill,

I don't know why you are looking to go outside but I have a word of 
caution.

We have been working with TDR matching and R&R for over a year now. 

While individual machines have acceptable P/Ts, we can't get them to 
correlate to each other. 

Anyone know how to solve this problem? Or does anyone have a better 
metric for measuring impedance?

Steve


Does anyone out there have a Northern Calif. source for TDR testing? 
 
thx
 
     
Bill Davis, Ph.D.
Diamond Multimedia Systems
Senior Scientist
Tel. 408.325.7868
Cell. 408.888.5650
e-mail: [log in to unmask]

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