Title :
Digital impedance bridge
Author :
Waltrip, Bryan C. ; Oldham, N.M.
Author_Institution :
Electron. & Electr. Eng. Lab., U.S. Dept. of Commerce, USA
fDate :
4/1/1995 12:00:00 AM
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;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
