Non-contacting voltage metering apparatus

Details Non-contacting voltage metering apparatus Non-contacting voltage metering apparatus

1988-09-07

1989-08-01

Paschall, M. H.

Electricity: measuring and testing

Electrostatic field

324458, 324 79R, G01R 2912

Patent

active

048536393

ABSTRACT:
A non-contacting voltage metering device for monitoring the electrical potential of a test surface includes a sensing integrator, and a tuning fork mechanism for modulating the capacitive coupling. The integrator input is coupled to the amplifier output and the integrator output is connected to a high-voltage FET output amplifier. The apparatus includes a feedback circuit with a phase sensitive detector which has an input coupled to the integrator output and an output coupled to the integrator input, and a reference terminal coupled to the modulating mechanism for receiving the predetermined frequency.

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patent: 4370616 (1983-01-01), Williams

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