Instrument for measuring electrical resistance or reactance

Details Instrument for measuring electrical resistance or reactance Instrument for measuring electrical resistance or reactance

1983-05-31

1986-02-11

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2700

Patent

active

045701164

ABSTRACT:
An instrument for measuring electrical resistance or reactance comprises a sine wave generator which generates an a.c. signal and reference signals for a phase sensitive detector. The a.c. signal is applied to a decade attenuator which adjusts its amplitude in dependence on a range switching. The signal is passed to a bridge section, wherein it is applied to a component to measure the value thereof. A voltage output, indicative of the value, is fed to a gain block, wherein its amplitude is re-adjusted in dependence on an input from the range switching. The voltage output is operated on by a phase sensitive detector and passes to a digital display. In the reactance mode, set by a function switching, the a.c. signal is phase shifted before being applied to the component, so that the voltage output is in phase with the reference signals.

REFERENCES:
patent: 4118665 (1978-10-01), Reinhardt
Maeda, An Automatic, Precision 1 Mhz Digital LCR Meter, 3-1974, pp. 2-9, hp Journal.

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