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April 2011

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Subject:
From:
Louis Hart <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Louis Hart <[log in to unmask]>
Date:
Thu, 21 Apr 2011 23:24:46 +0000
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Technetters, here is a real question, to replace the spurious one I just posted by mistake.

May I have some comments on measurement of hole sizes in printed circuit boards? For many years, I have  been using plug/pin gauges to check hole sizes. I recently noticed that the IPC test method 2.2.7 called for use of a microscope. My opinion is that the plug gauges are fine, and, if anything, better than a microscope, even a good 20X device. A small measurement quality study we did on some 40-100 x microscopes a while back suggested the error in using them is greater than the tolerance of a plug gage. But I don't want to get in trouble for using a non-recognized test method. Thanks for any comments.

Louis Hart
Compunetics
Monroeville, PA
USA
[log in to unmask]<mailto:[log in to unmask]>
412-858-1272

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