Combined AC-DC electrometer with AC feedback for drift compensat

Details Combined AC-DC electrometer with AC feedback for drift compensat Combined AC-DC electrometer with AC feedback for drift compensat

1977-05-20

1979-04-10

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

330 9, G01R 528

Patent

active

041491190

ABSTRACT:
An electrostatic voltmeter or electrometer which includes a probe sensor element for receiving electrostatic charge from a test surface whose potential level is desired to be measured. The probe is conditioned to receive both A.C. and D.C. signals which are amplified by a D.C. amplifier, with the A.C. signal from the probe being fed back to the D.C. amplifier to stabilize its output. In a preferred embodiment, a portion of the probe sensor element is periodically exposed to the test surface to impress the A.C. signal thereon which is utilized to correct the drift in the D.C. amplifier output.

REFERENCES:
patent: 2714136 (1955-07-01), Greenwood, Jr.
patent: 2741668 (1956-04-01), Iffland
patent: 3852667 (1974-12-01), Williams et al.
Scherbatskoy et al., The Capacitive Commutator; Rev. of Scien. Ins., vol. 18, No. 6, Jun. 1947, pp. 415-421.

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