A.C. Impedance measuring circuit with thermally controlled resis

Details A.C. Impedance measuring circuit with thermally controlled resis A.C. Impedance measuring circuit with thermally controlled resis

1978-10-23

1981-06-23

Beha, Jr., William H.

Electricity: power supply or regulation systems

Including a transformer or an inductor

Inductor with or in a bridge

324 62, 324DIG1, G05F 500, G01R 2702

Patent

active

042753457

ABSTRACT:
An a.c. circuit including a thermistor used as a variable resistance device. A d.c. current source is provided for varying the temperature, and hence the resistance, of the thermistor and a DVM is provided for giving an indication of the resistance thereof and/or for controlling the temperature varying current source in order to set the resistance of the thermistor to a defined resistance. The thermistor can form part of an a.c. bridge and the temperature varying current source can be arranged to adjust the resistance of the thermistor until the bridge is balanced.

REFERENCES:
patent: 2375497 (1945-05-01), Scully
patent: 2906957 (1959-09-01), Easter
patent: 3315153 (1967-04-01), Whatley
patent: 3597676 (1971-08-01), Moore

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