Capacitance meter bias protection circuit

Details Capacitance meter bias protection circuit Capacitance meter bias protection circuit

1976-04-26

1977-09-20

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Meter protection or fraud combatting

324 60C, G01R 136, G01R 2726

Patent

active

040500187

ABSTRACT:
Capacitance is measured using a conventional meter while a DC bias voltage in a range from 0 to 10K volts is applied across the capacitance under test. An LC series resonant circuit is disposed between the capacitance under test and one input of the capacitance meter to provide a low impedance path for the 1 MHz test signal produced by the capacitance meter. P-I-N diodes are disposed across the input terminals of the capacitance meter to shunt the discharged energy from the resonant circuit capacitance should the capacitor under test short circuit. A resistance is in series with the resonant circuit to provide a voltage divider to lower the voltage appearing across the capacitance-meter input terminals to a value below the damage-threshold voltage level of the capacitance-meter.

REFERENCES:
patent: 3371276 (1968-02-01), Schiff

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