SENSITIVE SOUND FAULT METER AND DETECTOR UTILIZING A DOUBLE SIDE BAND FREQUENCY CURRENT-GENERATOR

摘要

An electrical leakage detector indicating hazard level, for use in hospitals or the like, using a constant current generator having at least two side band frequencies on either side of the line frequency with a high impedance return to the ground from the constant current generator, together with a discriminator means to distinguish between the power line frequency and the two side band frequencies and for indicating departure of current from predetermined limits.