Article2011

Determination of the Planck constant with the METAS watt balance

Ali L. Eichenberger · Henri Baumann · B. Jeanneret · Beat Jeckelmann · W. Beer

103 citations0/0 files storedMetrologia

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

Abstract

The METAS watt balance project was initiated slightly more than a decade ago. Over this time, the apparatus has been through an uninterrupted series of upgrades that have improved its reliability to a point where continuous series of measurements can be taken fully automatically over periods of several months. A comprehensive analysis of possible systematic errors has now been completed and a large set of data has been analysed to calculate a value for the Planck constant h . This paper describes the watt balance in detail, explains the data acquisition and analysis thoroughly and presents the uncertainty budget. The value of the Planck constant determined with our apparatus is h = 6.626 069 1(20) × 10 −34 J s with a relative standard uncertainty of 0.29 × 10 −6 . This value differs from the 2006 CODATA adjustment by 0.024 µW W −1 .

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References

2012CODATA recommended values of the fundamental physical constants: 2010 2008CODATA recommended values of the fundamental physical constants: 2006 2008Revised formula for the density of moist air (CIPM-2007)2006Redefinition of the kilogram, ampere, kelvin and mole: a proposed approach to implementing CIPM recommendation 1 (CI-2005)1976A Measurement of the Gyromagnetic Ratio of the Proton by the Strong Field Method 2005Redefinition of the kilogram: a decision whose time has come 1994The Third Periodic Verification of National Prototypes of the Kilogram (1988-1992)2007Uncertainty Improvements of the NIST Electronic Kilogram

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2013Design of the new METAS watt balance experiment Mark II 2014A determination of Planck's constant using the NRC watt balance 2012Quantum metrology triangle experiments: a status review 2014Determination of the Planck constant using a watt balance with a superconducting magnet system at the National Institute of Standards and Technology 2012Reconciling Planck constant determinations via watt balance and enriched-silicon measurements at NRC Canada

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