The voltages in quadrature bridge with IVD

Castelli, F

Castelli, F (reprint author), Politecn Milan, Electrotech Dept, Via Dino Compagni 5, I-20131 Milan, Italy.

MEASUREMENT, 2017; 102 ( ): 291


The paper exploits the useful features of inductive voltage divider (IVD) for the inter-comparison of complementary impedances. Since the definition of the quantized Hall resistance (QHR) a measurement chain allowing calibration of capacitance and inductance standards in term of ac QHR is required. The illustrated new bridge method allows these calibrations by a very simple and accurate method performable, at maximum operating frequency of 3 kHz, with the standards in the range, from 0.2 pF to 20 mu F and from 20 mu H to 1 H and from 5 Omega to 500 M Omega. Voltages in quadrature bridge is balanced by the inductive voltage divider when the voltages at the bridge's diagonals are in quadrature. The main innovations of voltages in quadrature bridge, as a quadrature bridge, are to using one supplying voltage only and allowing the use of inductive voltage divider in comparing complementary impedance standards. The main applications of voltages in quadrature bridge are the direct comparison inductance-resistance and of calculable cross-capacitance to ac QHR at only 3 kHz maximum operating frequency. An experimental voltages in quadrature bridge was developed. Calibrations for directly inter comparing capacitance and inductance standards to a 10,000E2 resistance standard were performed. By test results, the comparison of the standards in the outlined range with few parts in 10(9)-10(8) appears achievable. Up-to-date a bridge method for directly inter-comparing inductance and resistance by an inductive voltage divider appears as a new bridge method. (C) 2017 Elsevier Ltd. All rights reserved.

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