Wiring board for testing loaded printed circuit board
View Patent ↗A wiring board for transmission of test signals between test point locations on a circuit board under test and an external analyzer having compliant contacts making electrical contact with a pad positioned on a conductive surface circuit layer having a trace extending to a second pad having a hole for receipt of an interface pin electrically connected to the external analyzer.
1. A loaded printed circuit board test fixture comprising:
an array of spaced interface probes extending through a probe plate and adapted for electrical connection to an external electronic test analyzer;
a plurality of test probes for contacting test point locations on a loaded printed circuit board under test;
a wiring board positioned between the probe plate and the loaded printed circuit board under test for routing test signals from the test probes to the interface probes;
the wiring board having at least one circuit layer positioned on top surface communicating with a plurality of interface pins extending through the wiring board at a first location on the wiring board and communicating with the test probes at a second location on the wiring board spaced from the first location.
2. The fixture of claim 1 , wherein the wiring board further includes a transfer board and the circuit layer is positioned on the transfer board.
3. The fixture of claim 2 , wherein there are a plurality of transfer boards each having at least one circuit layer.
4. The fixture of claim 3 , further comprising a spacer board positioned between adjacent transfer boards.
5. The fixture of claim 2 , wherein the circuit layer includes a via and a trace.
6. The wiring board of claim 2 , wherein there are a plurality of transfer boards each having at least one circuit layer.
7. The wiring board of claim 6 , further comprising a spacer board positioned between adjacent transfer boards.
8. The fixture of claim 1 , wherein the circuit layer includes a pad and a trace.
9. The fixture of claim 8 , wherein the trace contacts a via positioned in a hole in the transfer board.
10. The fixture of claim 9 , wherein each interface pin extends through a via.
11. The fixture of claim 10 , wherein the interface pin has knurled surfaces for contacting the trace.
12. The fixture of claim 9 , wherein the via has a plurality of flaps around an opening.