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DC ELECTROSTATIC VOLTMETER SAMPLING CONTROL AND POWER SUPPLY DIAGNOSTIC SYSTEM

IP.com Disclosure Number: IPCOM000024516D
Original Publication Date: 1980-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 58K

Publishing Venue

Xerox Disclosure Journal

Abstract

A frequently experienced limitation of DC electrostatic voltmeters is the asymmetry of their response to rising and falling signals. Typically, a device will respond more rapidly to a rising signal than it will to a falling signal. For many applications, this characteristic presents operational difficulties.

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DC ELECTROSTATIC VOLTMETER SAMPLING CONTROL AND POWER SUPPLY DIAGNOSTIC SYSTEM
J. E. Courtney

A frequently experienced limitation of DC electrostatic voltmeters is the asymmetry of their response to rising and falling signals. Typically, a device will respond more rapidly to a rising signal than it will to a falling signal. For many applications, this characteristic presents operational difficulties.

These problems have been overcome by using the method described in this disclosure. This approach insures that the electrostatic voltmeter will always begin its measurement from a low or zero level and rise to the level to be sampled. A practical method of accomplishing this is by using an optical coupler to short- circuit the power supply control signal, thereby holding the output at zero until the coupler is released. Under these conditions, the fast-rising response yields a measurement in the shortest possible time.

The use of a second optical coupler to apply a high control input will force the power supply to go to its upper extreme. This function, combined with the first coupler forcing the output to zero, causes the power supply to exercise its entire dynamic range. This operation provides a general-purpose diagnostic check on system response. For more detailed checking of mid-range values, a ramp function may be installed in place of the full-range level.

Volume 5 Number 6 November/December 1980 60 1

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