Patent ID: 7791353

Claim:
A ground loop locator comprising: (a) an exciter portion comprising: (i) an EMF generator comprising: (A) an AC periodic signal generator containing an exciter frequency; and (B) an amplifier containing an amplifier input and an amplifier output, the amplifier input conductively connected with the AC periodic signal generator; and (ii) a current transformer conductively connected with the amplifier output of the EMF generator; and (b) a detector portion comprising: (i) a Rogowski coil; (ii) a filter containing a filter input and a filter output, the filter input conductively connected with the Rogowski coil, the filter approximately tuned such that a signal at the exciter frequency of the AC periodic signal generator arriving at the filter input is substantially transmitted to the filter output; and (iii) a readout connected with the filter output, whereby the readout indicates the presence of a ground loop when a ground loop exists in conductors linked by the current transformer of the exciter portion and the Rogowski coil of the detector portion.