Apparatus for detecting the amplitude and phase of an a.c. signa

Details Apparatus for detecting the amplitude and phase of an a.c. signa Apparatus for detecting the amplitude and phase of an a.c. signa

1995-11-28

1997-02-11

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324 86, G01R 2504

Patent

active

056024690

ABSTRACT:
An apparatus for detecting the amplitude and phase of an a.c. signal detects the a.c. signal with signal detection means (4), calculates an a.c. signal that is phase-shifted by the amount of the phase characteristic .phi. of the calculation circuit (14) at the frequency of the detected a.c. signal, multiplies the detected a.c. signal by cos .phi., and multiplies by 1/sin .phi. the multiplication result subtracted by the phase-shifted a.c. signal.

REFERENCES:
patent: 4675614 (1987-06-01), Gehrke
patent: 4890056 (1989-12-01), Peters et al.
patent: 4983906 (1991-01-01), Hiller
patent: 5361312 (1994-11-01), Kuchel

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