Resistance-to-current converter

Details Resistance-to-current converter Resistance-to-current converter

1978-03-20

1979-03-13

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

324DIG1, 323 75H, G01K 724

Patent

active

041435508

ABSTRACT:
A resistance-to-current converter in which a sensing resistor, such as a resistance thermometer bulb for sensing changes in temperature, forms an arm in a resistance bridge which is periodically excited by a switching circuit interposed between a power supply and the input junctions of the bridge. The voltage produced at the output junctions of the bridge during the "on" and "off" excitation states are separately detected. The detected signal obtained in the "off" state is subtracted from that obtained in the "on" state to produce an output signal from which there is eliminated the error component resulting from a leakage resistance path coupled to said sensing resistor.

REFERENCES:
patent: 3076338 (1963-02-01), Peltola
patent: 3603147 (1971-09-01), Dorman
patent: 3887864 (1975-06-01), Knudsen
patent: 4072051 (1978-02-01), Peterson

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