Printed Circuit Board Continuity Testing
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
The testing of the continuity of circuits in a printed circuit board is normally effected by applying 28 volts DC to one end and checking the other end through a voltmeter which can detect no more than 20 ohms resistance in the circuit. To provide a more realistic test for the printed circuit board, a train of pulses, for example, 1,000, in a period of time, will be transmitted through the printed circuit board in the voltage and frequency range of actual computer usage of the printed circuit board. At the output of the circuit, a frequency counter will establish whether or not all pulses arrived at the other end of the circuit. A discrepancy between the pulses provided at the input and the pulses obtained at the output will provide a more accurate reading of the continuity in the circuit being tested.