Measuring and testing – Sampler – sample handling – etc. – Sample holder
Patent
1989-01-30
1990-01-23
Noland, Tom
Measuring and testing
Sampler, sample handling, etc.
Sample holder
73863, 51216H, G01N 132
Patent
active
048950335
ABSTRACT:
A plurality of fragments of printed circuit boards, so-called coupons, each having a row of plated-through holes to be examined and two reference holes, are mounted on positioning pins extending through the reference holes, and are then embedded in a molded block of a curable plastic material to form an independent multi-coupon sample with extending pin ends. A plurality of such samples are mounted in pockets of a sample holder so that their extending pin ends engage with hardened surface portions on the front face of the sample holder. The samples are then contacted by an abrasive element to remove material down to a cross-sectional level at a predetermined distance in front of the hardened surface portions. A jig can be used to cut out a coupon with reference holes from a circuit board. The sample holder includes a disc portion and a rim portion that are mutually angularly adjustable so as to simultaneously adjust a plurality of abrasion resistant stop screws of the sample holder in different positions for determining the termination of successive steps of abrasion.
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patent: 4800280 (1989-01-01), Satake
Christensen Asger P.
Voss Jorgen T.
Mollick Don R.
Noland Tom
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