Development and study of an automatic AC bridge for impedance measurement

Author

Dutta, M. ; Rakshit, A. ; Bhattacharyya, S.N.

Author_Institution

Dept. of Electr. Eng., Jadavpur Univ., Calcutta, India

Volume

2

fYear

2000

fDate

2000

Firstpage

668

Abstract

An automatic ac bridge method employing the principle of balancing by means of a stochastic gradient search algorithm has been presented. Among the various gradient search techniques, the Widrow-Hoff LMS technique has been chosen as it involves low computational burden. The LMS algorithm has been used by the authors for operation of an ac bridge operating with continuous variables. The relevant operation has been verified by simulation. It can measure negative impedance. A relation has been established between parameters to be used in LMS algorithm for discrete and continuous versions of the bridge. The convergence time for a relatively simple form of the LMS bridge, namely the R-R type bridge has been theoretically established and experimentally verified both by simulation and real time implementation. The frequency response of the LMS algorithm has also been determined

Keywords

automatic testing; bridge instruments; electric impedance measurement; frequency response; gradient methods; least mean squares methods; stochastic processes; Widrow-Hoff LMS technique; automatic AC bridge; computational burden; convergence time; frequency response; impedance measurement; negative impedance; stochastic gradient search algorithm; Bridge circuits; Computational modeling; Convergence; Frequency estimation; Frequency response; Impedance measurement; Least squares approximation; Stochastic processes; Time measurement; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Instrumentation and Measurement Technology Conference, 2000. IMTC 2000. Proceedings of the 17th IEEE

Conference_Location

Baltimore, MD

ISSN

1091-5281

Print_ISBN

0-7803-5890-2

Type

conf

DOI

10.1109/IMTC.2000.848820

Filename

848820