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Mon, 16 Sep 2002 11:38:50 -0700 |
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I don't think thermal shock testing is supposed to have any appreciable (certainly not any predictable) effect on impedance. If it does, there's something wrong with the board to begin with.
T. Reeves
-----Original Message-----
From: Jack Low [mailto:[log in to unmask]]
Sent: Sunday, September 15, 2002 9:51 PM
Subject: request of formula of calculation of impedance after thermal shock
Dear all:
we would like to know the formula to calculate the impedance before thermal shock abd after thermal shock on PCB,
and where can I find out the formula to calculate in IPC, any suggestions and nformation will be sincerely appreciated,Thanks a million! Have a nive day!
Best regards
Jacl low
[log in to unmask]
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