What does the strain gage test result measure against?   Is it the tensile
strength of the specimen?
and how does that comparison work? (how to interpret the result from the
test?)

(I am about to hire someone from outside to perform astrain gage test to see
if there is any correlation between ICT fixture and a cracked trace found
near a ICT probe.  )
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What is the most common, or grade 1 copper foil in terms of the copper class
and type  per IPC CF-152?

There are Type E    class 1, 2,  3, and 4.     and
There are Type W   class 5,6,7 and 8.

Which one of this is considered as grade 1 material?


Thanks for reading.

Rudolph Yu
NPI Engineer
Adaptec, Inc.

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