Kleinschmidt, P; Williams, J M; Fletcher, N E; Janssen, T J B M (2001) A cryogenic current comparator for quantum Hall resistance ration measurements. In: BEMC 2001- 10th British Electromagnetic Measurement Conference, 6-8 November 2001, Harrogate, UK.

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Abstract

A new cryogenic current comparator (CCC) bridge for quantum Hall resistance ration measurement has been constructed. Compared to previous CCC systems at NPL the new system differs in two aspects. Firstly, it uses a type II CCC,i.e. the ratio windings are on the outside and the detection winding is on the inside. This has the advantage that the CCC can be made very compact and fits into standard storage Dewar. Secondly, the bridge electronics uses a digital servo and the SQUID feedback loop is disabled during current reversals.

Item Type:	Conference or Workshop Item (UNSPECIFIED)
Subjects:	Quantum Phenomena
Last Modified:	02 Feb 2018 13:17
URI:	https://eprintspublications.npl.co.uk/id/eprint/2170