Digital impedance bridge

Author

Waltrip, Bryan C. ; Oldham, N.M.

Author_Institution

Electron. & Electr. Eng. Lab., U.S. Dept. of Commerce, USA

Volume

44

Issue

2

fYear

1995

fDate

4/1/1995 12:00:00 AM

Firstpage

436

Lastpage

439

Abstract

An impedance bridge that compares two-terminal standard inductors to characterized AC resistors in the frequency range of 10 Hz to 100 kHz is described. A dual-channel, digitally-synthesized source and sampling digital multimeter are used to generate and measure relevant bridge signals. A linear interpolation algorithm is used to autocalibrate the bridge to a 1 nF gas dielectric capacitor. An intercomparison of the new bridge with existing measurement standards conducted in the low audio frequency range shows agreement of 50 to 200 parts in 10⁶ for inductors for 1 mH to 10 H

Keywords

bridge circuits; bridge instruments; calibration; computerised instrumentation; digital multimeters; electric impedance measurement; inductors; interpolation; measurement standards; resistors; 10 Hz to 100 kHz; autocalibration; bridge signals; digital impedance bridge; dual-channel digitally-synthesized source; intercomparison; linear interpolation algorithm; low audio frequency range; measurement standards; sampling digital multimeter; two-terminal standard inductors; Bridges; Capacitors; Dielectric measurements; Frequency; Impedance; Inductors; Interpolation; Resistors; Sampling methods; Signal generators;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.377873

Filename

377873