Distance compensated electrostatic voltmeter

Details Distance compensated electrostatic voltmeter Distance compensated electrostatic voltmeter

1976-11-26

1978-08-15

Pellinen, A. D.

Photocopying

Including fiber optics

324 32, 324 72, G03G 2100, G01R 1900

Patent

active

041068696

ABSTRACT:
A d.c. type electrostatic voltmeter for use in measuring voltage potentials on a surface such as the photoconductive surface of an electrostatic type reproduction machine. Circuitry is provided to automatically compensate for variations the electrometer probe-to-surface spacing, the circuitry including an a.c. signal source, a circuit to superimpose an a.c. signal from the source through the input and onto the d.c. signal output of the electrometer probe, an amplitude detector to detect changes in the a.c. signal source amplitude resulting from changes in the probe-to-surface spacing, a feedback control responsive to such amplitude changes to adjust the amplitude of the combined d.c./a.c. signal to maintain a prescribed a.c. amplitude, and a filter to thereafter remove the a.c. signal leaving the corrected d.c. signal.

REFERENCES:
patent: 3404341 (1968-10-01), Young
patent: 3604925 (1971-09-01), Snelling et al.
patent: 3667036 (1972-05-01), Seachman
patent: 3851247 (1974-11-01), Vosteen et al.

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