Digital generator assisted impedance bridge

Abstract

A manually-operated prototype wide-range fourterminal-pair universal impedance bridge has been constructed in order to test ideas for an automated bridge. The least.relative uncertainty is 2x10'' at I kHz and about 2 0~1 0~ at 100 kHz. A two-phase digital voltage generator provides convenient sources for the two voltages required to bring the bridge to near but not exact balance. The detector offset voltages are measured with a vector voltmeter and used to correct for the inexact balance.

A simple double-balance impedance bridge for routine calibrations

“…In addition, a genetic algorithm was used to measure impedances using a low-cost digital acquisition process [4]. A prototype wide-range four-terminalpair universal impedance bridge was constructed [5].…”

Quadrature Bridge for R-C Comparisons based on Polyphase Digital Synthesis

“…An automation of the implementation, although possible, maintain the complexity and tends to increase the cost of the bridge [11], [12], [13], [14], [15], [16], [17], [18]. In the following, we describe an implementation of a 2TP quadrature bridge based on the direct digital synthesis [19], [20], [21] of the various sinewave signals involved in the quadrature bridge network.…”