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Date: | Sat, 28 Jun 2008 18:24:15 EDT |
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Hi GA Tan,
The failure definition for data loggers is: "Failure is defined as a maximum
20% nominal resistance increase within a maximum of five consecutive reading
scans."
That means you have to have five consecutive readings that are at least 20%
higher in electrical resistance than the corresponding [that means, at the same
temperature] initial temperature.
For data loggers, it is required that each daisy-chain be scan at intervals
not to exceed one minute. This later mandate has nothing to do with the failure
definition, but with the required monitoring.
Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com
**************
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