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Cryogenic current comparator bridge with dual SQUID detectors.

Williams, J M; Patel, P D; Holubar, T*; Good, J* (2014) Cryogenic current comparator bridge with dual SQUID detectors. In: 29th Conference on Precision Electromagnetic Measurement (CPEM 2014), 24-29 August 2014, Rio de Janeiro, Brazil.

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The cryogenic current comparator (CCC) resistance ratio bridge provides a high accuracy over a wide range of practical resistance values. Its performance is critically dependent on the choice of detector used to achieve a voltage null in the bridge. The necessary combination of low input current and voltage noise is not widely available in commercial instruments.
A SQUID is a competitive device as a voltage null detector when matched to the resistors being compared. This paper describes a CCC bridge for resistors in the range 1 to 10 k
, as well a quantised Hall resistance plateaux, employing two SQUIDS, one for current balance and one for voltage balance.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Keywords: Resistance measurement, SQUID, cryogenic current comparator
Subjects: Electromagnetics
Electromagnetics > Electrical Quantum Standards
Identification number/DOI: 10.1109/CPEM.2014.6898575
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/6405

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