Williams, J M (2011) The cryogenic current comparator and its application to electrical metrology. IET Proc. Sci. Meas. Technol., 5 (6). pp. 211-224.

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Abstract

The cryogenic current comparator (CCC), first demonstrated nearly 40 years ago, has become a key component of electrical metrology. It utilizes a superconducting screen to achieve a very high ratio accuracy and so has found many applications where the electrical units need to be scaled over decade values. It has been deployed over a wide range of currents from 100 A to 1 pA and has been used to verify the accuracy of electrical quantum effects such as the quantised Hall effect. This paper is a comprehensive review of the theory, design principles and applications of the CCC. In addition to a summary of its use in top level electrical metrology, some recent developments such as the use of high temperature superconducting materials and applications outside the realisation of electrical units are described.

Item Type:	Article
Subjects:	Electromagnetics Electromagnetics > Electrical Quantum Standards
Identification number/DOI:	10.1049/iet-smt.2010.0170
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/5342

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