Methods and apparatus for measuring relative gain and phase of v

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage

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324 83R, 324 77B, 364553, G01R 1900

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046382488

ABSTRACT:
A system for accurately measuring frequency response (phase and gain) in either a wireless or in a wired mode of operation is described. When used in either mode, a multiplexing method is employed which allows the use of a narrow channel bandwidth, with a simultaneous improvement in overall accuracy. Cancellation of all linear and time invariant errors, including those of the analog to digital conversion process, is thus accomplished. As a result, the system error only depends on the differential nonlinearity of the channel.

REFERENCES:
patent: 3636448 (1972-01-01), Nihashi et al.
patent: 3665304 (1972-05-01), Mayback
patent: 3813672 (1974-05-01), Weisser
patent: 3930147 (1975-12-01), Bellanger
patent: 4134072 (1979-01-01), Bolger
patent: 4307340 (1981-12-01), Inami
patent: 4423371 (1983-12-01), Senturia et al.
patent: 4484291 (1984-11-01), Schlosser
patent: 4492917 (1985-01-01), Inami
"A Wireless Computer Based Gain-Phase Meter with Application to Dielectric Sensing," R. K. Schweickert (M.I.T. 9/83).

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