PCB Copper - Thickness How to QA?

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dfullmer

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Hi,

Hope one of you smart guys out there has already solved this issue. How can I set up an incoming inspection of a PCB Fab to check that the board house actually made the copper in 2 oz and not some other weight. I don't think a measurement in thickness of the trace will work the solder mask thickness can vary so much as to make this an unreliable check. The only other thing I have been able to think of has been a current check and look for the amount of drop through the trace but this seems extreme.

Any thoughts?

Regards

dfullmer
 

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