A transformer-ratio bridge for the measurement of small loss angles

Author

Kwaaitaal, T.H. ; van den Eijnden, W.M.M.M.

Author_Institution

Dept. of Electr. Eng., Eindhoven Univ. of Technol., Netherlands

Volume

39

Issue

6

fYear

1990

fDate

12/1/1990 12:00:00 AM

Firstpage

874

Lastpage

877

Abstract

A development in the architecture of transformer-ratio bridges for the measurement of the loss angles of low-pass dielectrics is described. This has led to a sensitive and accurate bridge capable of measuring loss angles with a detection limit of 1×10^-8 rad (S /N=1 at a bandwidth of 1 Hz of the detector) and an accuracy of a few percent in the 10^-6 and higher ranges in the frequency range from 200 Hz to 200 kHz. The readout of the bridge is computer controlled and has an automatic capacitive balance. The most important characteristics of the bridge and their influence on the sensitivity and accuracy are discussed. Measurements as a function of frequency are presented as an example. The bridge can be used in numerous applications concerning the characterization of dielectric materials

Keywords

bridge instruments; computerised instrumentation; dielectric loss measurement; 1 Hz; 200 Hz to 200 kHz; accuracy; architecture; automatic capacitive balance; computer controlled readout; dielectric loss measurement; dielectric materials; loss angle measurement; low-pass dielectrics; sensitivity; transformer-ratio bridge; Automatic control; Bandwidth; Bridges; Detectors; Dielectric loss measurement; Dielectric losses; Dielectric measurements; Frequency measurement; Goniometers; Loss measurement;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.65787

Filename

65787