Shielded electrometer whose output is used to control width of p

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage

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Details

324 72, 324109, G01R 528, G01R 2912

Patent

active

041278062

ABSTRACT:
An electrometer having reduced spacing sensitivity, with the electrometer including a probe with a charge receiving sensor element and a surrounding shield. A voltage equivalent to that sensed by the probe element is fed back to the shield to render the electrometer substantially spacing insensitive. A duty cycle control regulates the width of electrical pulses to a power transformer whose output is fed back to the probe shield to maintain the spacing insensitivity. Means are also provided to automatically test and calibrate the electrometer prior to use.

REFERENCES:
patent: 3935532 (1976-01-01), Shuey et al.
patent: 4063154 (1977-12-01), Andrus et al.
patent: 4063155 (1977-12-01), Buchheit

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