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September 2002

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Subject:
From:
Bev Christian <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 10 Sep 2002 15:14:00 -0400
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TechNetters,
I'm a materials guy, not a reliability guy so be gentle in your answers!

Ideally one would like to have an infinite number of identical components
soldered all the same way on boards with identical characteristics.  Second
best would be infinite materials and a process that are within acceptable
windows.  More realistic would be 32 or more components soldered in one
shift to test boards from the same batch.

Now the next degenerative step.  Would you:
1) Have circuits with X daisy chain parts in series and when one part dies,
mod wire around it and keep thermally cycling.
2) Have Y multiple component series circuits and when one part dies the
circuit is then not considered any longer.
3) Have 10 components, each as a separate circuit.

I know what my choice would be, but I would like some feedback.

Also, do any of you make allowances in your daisy chain circuits to account
for components that have differing number of terminations?  For instance, if
you were testing 2 components, one with 5 terminations and another with 30,
would you break the pattern for the latter into more than one daisy chain?

Thanks in advance.

Bev Christian
Research in Motion

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