Time averaged amplitude comparison electrometer

Details Time averaged amplitude comparison electrometer Time averaged amplitude comparison electrometer

1981-06-22

1984-02-21

Tokar, Michael J.

Electricity: measuring and testing

Electrostatic field

355 14CH, 355 3R, G01R 2912

Patent

active

044332971

ABSTRACT:
The present invention is an electrometer probe disposed adjacent a photosensitive surface, the electrometer head providing an input amplifier that functions as a comparator to compare the voltage level on the photosensitive surface with a variable high voltage DC power supply. Control circuitry receives the output of the electrometer probe and in response to the signal adjusts the variable high voltage reference supply voltage. The control circuit adjusts the supply voltage to maintain the voltage at a ratio of time above (or below) total time as selected by a selection switch, for example 5 percent, 50 percent or 95 percent.

REFERENCES:
patent: 3525936 (1970-08-01), Vosteen
patent: 3667036 (1972-05-01), Seachman
patent: 3729675 (1973-04-01), Vosteen
patent: 3944354 (1976-03-01), Benwood et al.
patent: 4167325 (1979-09-01), Plumadore
patent: 4249131 (1981-02-01), Owen
patent: 4355885 (1982-10-01), Nagashima

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