| 摘要 |
<p>A test fixture for testing printed circuit boards includes an array of test probes (18) held in contact with a pattern of test points in a circuit array (22) printed on the circuit board (20). The circuit array is positioned with respect to a fiducial mark (28) on the board (20), and a tooling pin hole on the board (20) is aligned with the circuit array. The fixture includes a tooling pin (24) inserted in the tooling pin hole to hold the circuit array (22) in a fixed position relative to the test probes (18) during testing. The fiducial mark (28) is sensed, and an optical reading shows misalignment of the test points on the board relative to the probes. The tooling pin (24) is adjusted on the fixture (10) to move the board (20) relative to the probes (18) to correct misalignment. The alignment of the board (20) on the fixture (10) can be optically sensed by a lens system (104), fiber optic image conduit (72), light source (96, 98), an image enlarger (60) and video probe (70), that produces images of the fiducial mark and a known zero reference point on a TV monitor (118).</p> |
