Electricity: measuring and testing – Electrostatic field – Using modulation-type electrometer
Patent
1994-12-19
1996-01-30
Wieder, Kenneth A.
Electricity: measuring and testing
Electrostatic field
Using modulation-type electrometer
324109, 324 72, 324457, 355216, G01R 2112
Patent
active
054883016
ABSTRACT:
An electrostatic voltmeter suitable for use in a non-contacting, positive or negative potential sensing, type electrostatic voltmeter. The invention enables a flexible, low cost electrostatic voltmeter to be produced using high-voltage field-effect transistors in the circuit design. The invention further includes input conditioning components that enable high-voltage sensing and high-voltage feedback in such a manner that processing of the input signal from the sensor is accomplished without producing a variation in the current passing through the field-effect transistor in response to voltage variations. Elimination of this variation further reduces the susceptibility of the remaining signal processing circuitry to transient direct current signals. A differential cascode as the input stage is the preferred configuration for the input conditioning components.
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Buhler Steven A.
Mojaradi Mohamad M.
Vo Tuan A.
Werner, Jr. Alan J.
Zomorrodi Mehrdad
Basch Duane C.
Solis Jose M.
Wieder Kenneth A.
Xerox Corporation
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