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June 2008

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Subject:
From:
Werner Engelmaier /* <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
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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