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TitleImproving the performance of the force comparator in a watt balance based on pressure balances
Publication TypeConference Paper
Year of Publication2012
AuthorsSutton, C.M., Fitzgerald M.P., and Carnegie K.
Conference NameCPEM Digest (Conference on Precision Electromagnetic Measurements)
Date Published2012
KeywordsComparators (optical), Electromagnetic forces, Electromagnetism, Force comparator, Gravitation, Gravitational forces, Measurement standards, Planck constants, Precision balances, Pressure balance, Twin pressure balance, Watt balance
AbstractA watt balance based on pressure balances has been proposed for a measurement of the Planck constant and for a non-artefact realisation of the kilogram. This watt balance uses twin gas-operated pressure balances as the force comparator to compare the gravitational force on a test mass with the electromagnetic force on a current-carrying coil in a magnetic field. In this paper the results of initial trials with a twin pressure balance as a mass/force comparator are presented and ways of improving this performance are investigated. The focus is on reducing the damping in the force comparator. © 2012 IEEE.

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