Low-Frequency Signal-Pickup Cable Tester

A cable-testing apparatus has been designed for use in detecting a short or open circuit in a cable, subject to a special frequency requirement as explained in the next paragraph. This cable tester is based on the injection of a signal at one end of the cable and the use of a pickup coil placed adjacent to the cable to detect the signal. The pickup coil is moved along the outside of the cable until the signal is lost; the loss of signal indicates the location of a short or open circuit.