D. C. electrometer

Details D. C. electrometer D. C. electrometer

1976-11-26

1977-12-13

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324109, 324 72, 355 14, G01R 528

Patent

active

040631540

ABSTRACT:
Feedback circuit for the probe of an d.c. type electrostatic voltmeter to reduce spacing sensitivity thereof. A variable gain amplifier is employed to control the amplitude of the a.c. signal output of a square wave oscillator in response to the potential sensed by the probe. The a.c. signal output drives a high voltage transformer, the output of which is rectified to provide a d.c. signal output matching the potential sensed by the probe. The d.c. output is returned to the probe housing to bias the housing to a potential equal to the potential read by the probe. A sample and hold circuit enables readout of the d.c. signal output.

REFERENCES:
patent: 3753102 (1973-08-01), Beck
patent: 3851247 (1974-11-01), Vosteen et al.
patent: 3887877 (1975-06-01), Vosteen
patent: 3935531 (1976-01-01), Slomcenski

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