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Date: | Fri, 27 Jun 2008 16:22:12 +0800 |
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Hi All,
Base on the table 4.4 from IPC-9701 the definition for:-
Failure Definition:
a) Event detector, 1000ohms, 10 events (maximum), 1
micro-second duration (maximum), report first verified as
time-to-failure
AND/OR
b) Data logger/voltmeter 20% nominal resistance increase
(maximum), five readings/scans (maximum).
Currently, we are using data logger to determine/filter the failure.
From one of the lab, they recommend a failure is defined by 300ohms/10
events (maximum), 1msec duration (maximum). Is this an acceptable
standard?
For item (b), "five readings/scans (maximum)",
Base on IPC 9701, using a data logger to scan interval durations of less
than 1 minute is mandated. -- Am I right that with a data logger scan
time less than 1 minute, it is considered a failure with 5 scans more
than 20% nominal resistance increase (maximum)?
Thanks!
Best Regards
GA Tan
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