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Precision high-value resistance scaling with a two-terminal cryogenic current comparator

Published

Author(s)

Randolph E. Elmquist, George R. Jones, Felipe L. Hernandez-Marquez, Marcos Bierzychudek

Abstract

We describe a cryogenic two-terminal high-resistance bridge and its application in precision resistance scaling from the quantized Hall resistance (QHR) at RH = RK/2 = 12 906.4035 _ to decade resistance standards with values between 1 M_ and 1 G_. The design minimizes lead resistance errors with multiterminal connections to the QHR device. A single variable voltage source and resistive ratio windings are utilized to achieve excellent dynamic stability, which is not readily obtained in low-current measurements with conventional cryogenic current comparators (CCCs). Prototypes of his bridge have been verified by a successful international comparison of high-resistance scaling using two-terminal CCCs in the national metrology institutes of Argentina, Mexico, and the United States.
Citation
Review of Scientific Instruments
Volume
85
Issue
044701

Keywords

electrical resistance standard, quantized Hall resistance, national metrology institute, cryogenic current comparator, key comparison
Created March 1, 2014, Updated February 19, 2017