Measuring apparatus for a passive element value using a current

Details Measuring apparatus for a passive element value using a current Measuring apparatus for a passive element value using a current

1993-07-30

1996-05-21

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

With auxiliary means to condition stimulus/response signals

324650, G01R 2316, G01R 2728

Patent

active

055193250

ABSTRACT:
The present invention relates to a measuring apparatus for a passive element value using a current vector in which a passive element value is measured by detection of the voltage vector drops at both ends of the passive element and current vectors flowing through the passive element when since waves are applied. The sine wave oscillator applies to a passive measuring element sine waves having a constant maximum value and a constant frequency, and a voltage detecting unit detect a voltage vector drop at the passive measuring element when the sine waves are applied. A current detecting unit then detects a current vector flowing through the passive measuring element, a multiplying circuit unit multiplies an output of the voltage detecting unit to that of the current detecting unit to thereby detect a phase difference between the voltage and the current, and a microcomputer performs an operational process on the passive element value with the voltage vector, current vector and the phase as variables.

REFERENCES:
patent: 4409543 (1983-10-01), Sugihara
patent: 4481464 (1984-11-01), Noguchi
patent: 4935692 (1990-06-01), Wakasugi
patent: 4947130 (1990-08-01), Kitayoshi
patent: 5019781 (1991-05-01), Tanimoto

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