This paper describes the realization of a two terminal-pair digital impedance bridge and the test measurements performed with it. The bridge, with a very simple architecture, is based on a commercial two-channel digital signal synthesizer and a synchronous detector. The bridge can perform comparisons between impedances having arbitrary phase and magnitude ratio: its balance is achieved automatically in less than a minute. R-C comparisons with calibrated standards, at kHz frequency and 100 kohm magnitude level, give ratio errors of the order of 10−6, with potential for further improvements.
@article{arxiv.1408.2638,
title = {Experiences with a two terminal-pair digital impedance bridge},
author = {Luca Callegaro and Vincenzo D'Elia and Marian Kampik and Dan Bee Kim and Massimo Ortolano and Faranak Pourdanesh},
journal= {arXiv preprint arXiv:1408.2638},
year = {2014}
}