Modified bridge circuit for measurement purposes

Details Modified bridge circuit for measurement purposes Modified bridge circuit for measurement purposes

1982-10-07

1985-07-09

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324DIG1, G01R 2702

Patent

active

045284997

ABSTRACT:
In a four element modified bridge circuit for measurement purposes at least one impedance element is variable according to a magnitude to be measured. Via a first operational amplifier a DC supply voltage is connected across two bridge nodes facing each other, and at the other two nodes facing each other an output signal is delivered corresponding to the magnitude to be measured. By means of a second operational amplifier one of the output nodes is virtually drawn to ground so that the signal at the second output bridge node is referenced to ground. Thus, the signal at the second output node corresponds to the desired measured magnitude without a superimposed power supply voltage and may be amplified by a third standard operational amplifier without the need of a differential amplifier circuit.

REFERENCES:
patent: 3908164 (1975-09-01), Parker
patent: 4205556 (1980-06-01), Runyan
patent: 4229692 (1980-10-01), Graeme
Carius, Von W. "Multichannel Temperature Measuring Device with Linearization for Pt 100-Resistance Thermometers", Technisches Messen, vol. 48, Apr. 1981, Nr. 4, pp. 127 through 130.
Cutkosky, R. D. and Davis, R. S., "Simple Control Circuit for Temperature Regulation and Other Bridge Applications", 8127 Review of Scientific Instruments, vol. 52(1981), Sep. 9, pp. 1403-1405.

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