Patent ID: 7808228

Claim:
A phasing voltmeter, comprising: (a) a reference source transmitting a reference voltage signal; (b) a field probe measuring a field voltage signal representative of that carried by a field conductor; (c) a first unit in communication with said reference source and receiving said transmitted reference voltage signal, said first unit carrying: a generator that produces a standard frequency source signal, a phase angle comparator that determines the phase difference between the phase angle of said reference voltage signal and the phase angle of said standard frequency source signal, said phase difference in digital form, and a signal generator that modulates a carrier wave using said digital form of said phase difference and transmits said modulated carrier wave; and (d) a second unit in communication with said first unit and receiving said transmitted modulated carrier wave, said second unit carrying: a generator that produces a standard frequency source signal, a receiver that extracts said phase difference from said carrier, a frequency offset oscillator that produces a surrogate voltage signal from said phase difference and said standard frequency source signal, said surrogate voltage signal replicating said reference voltage signal of said reference source, said second unit transmitting said surrogate voltage signal to said meter probe, wherein said meter probe determines the phase difference between said surrogate signal and said field voltage signal, said meter probe having a display for displaying said phase difference.