| 摘要 |
PCT No. PCT/SE88/00402 Sec. 371 Date Apr. 10, 1989 Sec. 102(e) Date Apr. 10, 1989 PCT Filed Aug. 9, 1988 PCT Pub. No. WO89/01389 PCT Pub. Date Feb. 23, 1989.For facilitating the quality control examination of the metal plating of holes in printed circuit boards, several test pieces are cut from circuit boards. Each test piece includes within its perimeter at least one, and preferably a row of at least three metal plated holes. The perimeter of each test piece, as cut, is notched with outwardly opening grooves so as to fit in a fixture in a preselected disposition. Several test pieces are places in a fixture, which serves as a mould for plastic material. After the plastic material hardens around the test pieces, a portion of the composite of test pieces and hardened plastic is sliced off, at a level which exposes half of each metal plated hole. The grooves allow great precision and simple handling. |
