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

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison

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324 7613, 364487, G01R 2500

Patent

active

054989558

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), Miller
patent: 5361312 (1994-11-01), Kuchel

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