Measuring device and method for its operational setting

Details Measuring device and method for its operational setting Measuring device and method for its operational setting

1991-06-24

1993-06-08

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324658, 324662, G01R 2708

Patent

active

052183114

ABSTRACT:
In a measuring device which serves to measure a geometrical variable with the use of a sensor which is fed an alternating measuring current of constant amplitude by a regulated, phase-dependent current source. An alternating supply voltage and an alternating measuring voltage tapped by the sensor via a feedback path of the current source is superimposed in a superimposition stage, which belongs to the current source and downstream of which a reference element for determining the alternating measuring current is connected, to form a total voltage present at the reference element. In order to match a characteristic representing the relationship between the alternating measuring voltage and the geometrical variable to a prescribed characteristic curve, at least one of the alternating voltages fed to the superimposition stage is varied. The variation can concern both the amplitude and the phase.

REFERENCES:
patent: 4167697 (1979-09-01), Gerber
patent: 4228392 (1980-10-01), Abbe et al.
patent: 4724709 (1988-02-01), Antonazzi, Sr. et al.

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