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Alignment of the NPL Mark II Watt balance.

Robinson, I A (2012) Alignment of the NPL Mark II Watt balance. Meas. Sci. Technol., 23 (12). 124012

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Abstract

To reach uncertainties in the region of 1 part in 10^8 a moving-coil watt balance not only requires the accurate measurement of voltage, resistance, velocity, mass and the acceleration due to gravity but, in addition, requires the apparatus to be adjusted correctly to minimize the second order effects which can reduce the accuracy of the measurement. This paper collects
together the alignment and correction techniques that have been developed at NPL over many years and are required to minimize the uncertainty of the measurement. Some of these techniques are applicable to all watt balances, whilst a few are specific to watt balances that employ a conventional beam balance to support a circular coil in a radial magnetic field: such
as the NPL Mark II watt balance, now known as the NRC watt balance.

Item Type: Article
Keywords: Planck constant, watt balance, kilogram, electronic kilogram, quantum kilogram, redefinition, SI units
Subjects: Engineering Measurements
Engineering Measurements > Mass, Force, Pressure
Identification number/DOI: 10.1088/0957-0233/23/12/124012
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5676

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