Allen,
I think you may be referring to the 'PerfecTest' coupon.  The coupon is 
used in conjunction with a Perfectest probe for verifying inner layer 
registration.  For more info, contact American testing Corporation at 
800-635-5384.  Hope this helps.

Rob Eckwall
Proto Engineering Corporation


At 04:11 PM 11/17/00 +0800, you wrote:
>Dear techneters,
>
>Do you have any idea about the "Perfect Coupon"?
>I heard that it was applied on the  high layer count products to verify 
>layer registration (both x & y direction), via plating resistance.etc.
>Could someone describe how to design this coupon?
>
>Thanks a lot!
>
>Allen Hu(­J§»¶©)Q80_5380
>Q&R Engineering Section
>Quality Assurance Department
>Tel:886-3-3231111 ext:5363
>Fax886-3-3235874

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