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]> 
Sent by: TechNet <[log in to unmask]>
07/30/2010 05:10 PM
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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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