Apparatus for measuring vector voltage ratio

Details Apparatus for measuring vector voltage ratio Apparatus for measuring vector voltage ratio

1987-03-04

1989-12-19

Lall, Parshotam S.

Boots, shoes, and leggings

324 57R, 324 83R, 324 83Q, G01R 2700

Patent

active

048887013

ABSTRACT:
An apparatus is disclosed for providing the projections of signals supplied to two inputs on mutually perpendicular axises by applying a different combination of the signals respectively at said input terminals and quadrature phases of an AC wave to each of four phase detectors or by applying each combination in sequence to each phase detector. Means are provided for calculating impedances from the outputs of the phase detectors when the voltages applied to the inputs are respectively those appearing across an unknown impedance and a calibrated resistor that is in series with it, there being an AC voltage applied across the series circuit.

REFERENCES:
patent: 4181949 (1980-01-01), Hall
patent: 4196475 (1980-04-01), Hall
patent: 4283675 (1981-08-01), Sparber
patent: 4306297 (1981-12-01), Sugihara et al.
patent: 4342089 (1982-07-01), Hall
patent: 4409543 (1983-10-01), Sugihara
patent: 4481464 (1984-11-01), Noguchi et al.
patent: 4654585 (1987-03-01), Yagi

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