Capacitance measuring device including an overrange circuit

Details Capacitance measuring device including an overrange circuit Capacitance measuring device including an overrange circuit

1983-07-05

1986-10-14

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324115, G01R 2726

Patent

active

046175121

ABSTRACT:
A capacitance measuring device having an astable multivibrator, a monostable multivibrator, a metering circuit and an overrange circuit. The astable multivibrator generates a repetitive series of evenly spaced pulses which are received by the monostable multivibrator to which a capacitor of unknown value is connected. Each of the pulses initiating a voltage output in the monostable multivibrator which remains in the high state for a length of time linearly proportioal to the value of the unknown capacitor. Thereafter, the voltage output of the monostable multivibrator reverts to the low state and remains at the low state until it receives the next one of the repetitive pulses. The metering means averages the high and low states of the voltage output and provides a pair of average voltage readings indicative of capacitance value of the unknown capacitance. One of the average voltage readings being a true reading of the value of the unknown capacitor and the other of the average voltage readings being a false reading of the value of the unknown capacitor. The overrange circuit provides an indication when the reading of capacitance value is false thereby enabling a user of the device to disregard this reading.

REFERENCES:
patent: 2940037 (1960-06-01), Lide
patent: 3986108 (1976-10-01), Thomas
patent: 4173736 (1979-11-01), Adams
patent: 4282480 (1981-08-01), Fujito et al.
patent: 4295091 (1981-10-01), Ponkala
Rao et al., A Novel Capacitance Meter, 4-1978, 70-74.
Horner, Joseph L., "What's Your Capacity," Optical Engineering, Mar./Apr. 1983, vol. 22, No. 2, p. SR-044.

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