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Metrologia Volume 44 Number 6 Create an alert RSS this journal

I A Robinson and B P Kibble 2007 Metrologia 44 427 doi:10.1088/0026-1394/44/6/001

An initial measurement of Planck's constant using the NPL Mark II watt balance

I A Robinson and B P Kibble

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Abstract References Cited By

During 2006 modifications were made to the NPL Mark II moving-coil watt balance which eliminated several significant sources of error. The apparatus was run from October 2006 to March 2007 to check its operation and to produce a preliminary value of Planck's constant h. This paper reports the current state of the work and predicts the uncertainty that is expected to be achievable with the existing apparatus. The preliminary value of h is 6.626 070 95(44) × 10−34 J s, which corresponds to a value of the Avogadro constant of NA = 6.022 139 99(40) × 1023 mol−1.


PACS

07.50.-e Electrical and electronic instruments and components

07.10.Lw Balance systems, tensile machines, etc.

06.30.Dr Mass and density

Subjects

Instrumentation and measurement

Dates

Issue 6 (December 2007)

Received 10 July 2007

Published 11 October 2007



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