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A cryogenic current comparator based resistance bridge for the range 10 k to 1 G .

Fletcher, N E; Janssen, T J B M; Williams, J M (2001) A cryogenic current comparator based resistance bridge for the range 10 k to 1 G . In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

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Abstract

A resistance ratio bridge based on a cryogenic current comparator (CCC) has been built to cover the range from 10 k to 1 G . The bridge employs a current balancing technique using an FET as a voltage controlled resistor, which has recently been modified to include a digital servo system. The performance observed so far should give a resolution of 0.1 ppm at 1 G , with a total calibration uncertainty of 1 ppm.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: Quantum Phenomena
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2168

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