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Date: | Mon, 2 Aug 2010 13:57:07 -0500 |
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The current "A" and "B", or "A/B" coupons test the largest component hole
and its associated pad size that will fit on the coupon and the smallest
via hole with its associated pad size. The "A/B-R" adds the tightest
hole/pad relationship on the board, which is not always caught in the
other coupons. It also has registration holes/pads that can be
electrically tested as well as microsectioned. At one time it also had
traces from which one could possibly determine etch-loss. I'm not sure if
the final version had them though. Chris, are you out there?
Tom
Louis Hart <[log in to unmask]>
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[TN] A/B-R coupons
TechNetters, does anyone have a description of the A/B-R coupons that has
been under discussion by IPC?
I would like to have an understanding of how it works and what it
accomplishes.
Thanks for any information.
Louis Hart
Compunetics
Monroeville, PA
USA
[log in to unmask]<mailto:[log in to unmask]>
412-858-1272
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