Impedance measuring device

Details Impedance measuring device Impedance measuring device

1997-04-09

1999-03-23

Regan, Maura

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Calibration

324130, 702124, G01R 2726

Patent

active

058865292

ABSTRACT:
In the prior art multiple calibration standards are required to calibrate multiple measurement ranges in an impedance measuring apparatus and calibration is time-consuming. An impedance measuring apparatus incorporating the invention is provided with a reference resistor part and the relative error among the measurement ranges is corrected automatically using the reference resistor. A single range is calibrated using a single impedance standard so that absolute calibration is carried out for all of the ranges. When correcting the relative error for the various ranges via the reference resistor, measurement takes place at a value smaller than for the full scale of the range and errors caused by resolution, linearity and the S/N ratio are propagated throughout the ranges and accumulate. To prevent this, a signal normalizing part is placed on the front section of an A-D converter and another signal normalizing part is placed on the front section of a frequency converter.

REFERENCES:
patent: 4337517 (1982-06-01), Nickel et al.
patent: 4667153 (1987-05-01), Doyle
patent: 4751654 (1988-06-01), Lyrra
patent: 5258704 (1993-11-01), Germer
"High Performance Digital Multimeter with `Internal Calibration`", Goeke, W., Proc. Instrumentation and Measurement Conf. 20 Apr. '88, pp. 292-296.
European Search Report, EP 97 30 2511, 11 Sep. 1997.

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