Articlebronze2014

A determination of Planck's constant using the NRC watt balance

Ciro Alberto Sánchez · Barry Wood · R G Green · Jacques O. Liard · Dave Inglis

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Scientific Measurement and Uncertainty Evaluation Calibration and Measurement Techniques Advanced Electrical Measurement Techniques

Abstract

We have measured Planck's constant and have obtained a value of 6.626 070 34(12) × 10 −34 J s. To our knowledge this measurement of h has the lowest uncertainty reported to date. This result has been obtained from measurements of four masses of different material and nominal values varying from 1 kg to 250 g. The experimental procedures and the measurement uncertainties are described in detail.

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References

1980New Method for High-Accuracy Determination of the Fine-Structure Constant Based on Quantized Hall Resistance 1976A Measurement of the Gyromagnetic Ratio of the Proton by the Strong Field Method 2005Redefinition of the kilogram: a decision whose time has come 1990A Realization of the SI Watt by the NPL Moving-coil Balance 1998Accurate Measurement of the Planck Constant 2001History and progress in the accurate determination of the Avogadro constant 2011Towards the redefinition of the kilogram: a measurement of the Planck constant using the NPL Mark II watt balance 2005The BNM Watt Balance Project

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2017A determination of the Planck constant using the LNE Kibble balance in air 2016Invited Article: A precise instrument to determine the Planck constant, and the future kilogram 2017A summary of the Planck constant determinations using the NRC Kibble balance 2014Determination of the Planck constant using a watt balance with a superconducting magnet system at the National Institute of Standards and Technology 2014Towards a new SI: a review of progress made since 2011

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