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Characterisation of a selection of AC and DC resistance bridges for standard platinum resistance thermometry.

Pearce, J V; Gray, J; Veltcheva, R I (2016) Characterisation of a selection of AC and DC resistance bridges for standard platinum resistance thermometry. Int. J. Thermophysics, 37 (11). p. 109.

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Abstract

Accurate resistance bridges are used to measure the output of standard platinum resistance thermometers at the level of parts per million and as such play a critical role in the realization and dissemination of the ITS-90. For AC bridges, the ratio test unit has been available for some time, and for both AC and DC bridges the increasing availability of resistance bridge calibrators based on combinatorial calibration have increased the ease with which the accuracy and linearity of resistance bridges may be determined, under conditions which provide a realistic representation of the actual measurement setup. In this study, the performance of 14 resistance bridges which were available for testing at NPL, consisting of a range of manufacturers and types, has been evaluated. In general the bridges are found to comply with the manufacturers specifications. The uncertainty associated with RBC measurements has also been determined using Monte Carlo techniques and is found to be of the order of 10% for most bridge types.

Item Type: Article
Keywords: Resistance bridge, RBC, SPRT, resistance thermometry, temperature standards
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1007/s10765-016-2113-6
Last Modified: 02 Feb 2018 13:13
URI: http://eprintspublications.npl.co.uk/id/eprint/7279

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