Electrostatic voltage metering apparatus

Details Electrostatic voltage metering apparatus Electrostatic voltage metering apparatus

1996-09-10

1999-03-23

Ballato, Josie

Electricity: measuring and testing

Electrostatic field

324109, 324679, 324658, 324 72, G01R 2922

Patent

active

058865284

ABSTRACT:
A handheld fieldmeter is implemented with an automatic function to drive the voltage on an output node of signal processing circuitry to circuit ground while a sensing electrode is disposed in a static-free environment. In response to a binary signal indicating whether the output node voltage is above or below ground, a microprocessor repeatedly increments/decrements a stored auto-zero multibit number, and generates successive PWM pulse streams of differing duty cycles determined by the incremented/decremented auto-zero number. The successive PWM pulse streams are integrated to ultimately produce fine zero adjustment current used by the signal processing circuitry to drive the output node voltage essentially to circuit ground. The fieldmeter also includes a pair of LEDs relatively positioned with the sensing electrode to emit light beams that intersect at the surface of a charged object when the sensing electrode is positioned a prescribed distance from the charged object. The LEDs are energized to emit their beams in alternation so as to provide a clear indication when the sensing electrode is so positioned by a user.

REFERENCES:
patent: 4843344 (1989-06-01), Cox
patent: 4853639 (1989-08-01), Vosteen et al.
patent: 4878017 (1989-10-01), Williams
patent: 4922182 (1990-05-01), Cox
patent: 4973910 (1990-11-01), Wilson
patent: 5323115 (1994-06-01), Werner

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