High precision capacitance bridge

Details High precision capacitance bridge High precision capacitance bridge

1985-10-01

1988-09-20

Eisenzopf, Reinhard I.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 60C, 324DIG1, G01R 2726

Patent

active

047728442

ABSTRACT:
A capacitance measuring device and method including a ratio transformer, a reference capacitor(s), and multiplying digital to analog converters connected to form a bridge, the converter being adjustable to at least partially balance the bridge. The bridge can further include a 90.degree. phase shifter and reference capacitors to balance the real part of the unknown impedance. An internal calibration scheme calibrates various components of the bridge.

REFERENCES:
patent: 3473117 (1969-10-01), Ito
patent: 3562641 (1971-02-01), Fulks
Cutkosky, An Automatic High-Precision Audiofrequency Capacitance Bridge, IEEE Transactions on Instrumentation and Measurement, vol. IM-34, No. 3, Sep. 1985, pp. 383-389.

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