Circuit Card for Testing Board to Board Cables for Leakage Current
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Cables that connect one circuit board to another are tested by removing the circuit cards that are normally plugged into the boards and then substituting cards with a special test circuit. A test card has a latch for each pin of the card, and it has a circuit for setting the latch when a current at a selected threshold level appears at the corresponding pin. A current above the threshold signifies a failure in one of the board to board cables. A number of identical cards permit all of the card positions of one board to be monitored at the same time. A controller is connected to one of the cards by a cable, and the other cards are connected by a jumper from one card to the next.