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An automated cryogenic current comparator resistance ratio bridge for routine resistance measurements.

Williams, J M; Janssen, T J B M; Rietveld, G*; Houtzager, E* (2010) An automated cryogenic current comparator resistance ratio bridge for routine resistance measurements. Metrologia, 47 (3). pp. 167-174.

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Abstract

A design of an automated CCC resistance ratio bridge for routine measurements in a national metrology institute or standards laboratory is described. It employs a type II CCC for use in a low loss liquid helium storage vessel and can be continuously operated from the mains power via specialised isolated supplies. All parameters including the servo control loops are digitally controlled. Noise sources in the system are analysed using the Allan deviation and it is demonstrated that non-white noise sources can be eliminated by choosing an appropriate current reversal rate.

Item Type: Article
Keywords: resistance measurement, CCC, Allan deviation, Allan variance, digital servo
Subjects: Electromagnetics
Electromagnetics > Electrical Quantum Standards
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4638

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