Standards for the measurement of the phase angles of resistors

1 January 1975

journal article
Published by Institution of Engineering and Technology (IET) in Proceedings of the Institution of Electrical Engineers

Vol. 122 (5) , 576-578
https://doi.org/10.1049/piee.1975.0159

Abstract

A 100 Ω phase-angle standard has been constructed by mounting a small evaporated metal-film resistor in a copper tube with side tubes for the potential connections. The inductance of this 4-terminal-pair configuration (⋍6 nH) was determined by measuring the inductance of similar resistors which had been silver plated to reduce their resistance. The effective capacitance (+0.03 pF) was derived from phase-angle comparisons of 100 Ω and 1 kΩ resistors. The uncertainty in the phase angle of the 100Ω standard is less than 0.1μ rad for ω = 10⁴, an uncertainty in time constant of less than 10ps. An a.c. bridge for the measurement of very small inductances and a 10:1 bridge for the comparison of the phase angles of resistors are described.

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