NDLI: Toward the Redefinition of the Kilogram: Measurements of Planck's Constant Using Watt Balances

Content Provider	IEEE Xplore Digital Library
Author	Robinson, I.A.
Copyright Year	1963
Abstract	The watt balance relates electrical and mechanical power to determine the SI watt, which, in conjunction with an SI ohm, can determine the SI ampere or volt. It can also be used to measure Planck's constant h in SI units, and if the SI is altered to fix the value of Planck's constant rather than the value of the mass of the prototype kilogram, the last artifact standard will be eliminated from the SI. An ensemble of watt balances, which is run by laboratories around the world, could then provide a way of maintaining the SI unit of mass. At present, there are three operational watt balances, with more planned or under construction. Two laboratories, namely, the National Institute for Science and Technology (NIST) and the National Physical Laboratory (NPL), have published results from their recent watt balance measurements. These results disagree by more than their combined standard uncertainties, and further work is required to discover the source of the discrepancy.
Sponsorship	IEEE Instrumentation and Measurement Society Bureau international des poids et mesures IEEE International Bureau of Weights and Measures (BIPM) URSI NBS Agency Ind. Sci. & Technol., Min. Int. Trade & Ind. Sci. Council Japan International Union of Pure and Applied Physics (IUPAP) NIST NRCC National Conference of Standards Laboratories (NCSL) Allen Osborne Associates Andeen-Hagerling, Inc. Ballantine Lab. Inc. Clarke-Hess Communications Research Corp. Fluke Corporation Guildline Instruments Hewlett-Packard Co. Julie Res. Lab. Inc. Keithley Instruments, Inc. Measurements International Ltd. Canada QuadTech Inc. Quantum Design Inc. Rotek Instrum. Corp. Tegam Inc. Tektronix Inc
Starting Page	942
Ending Page	948
Page Count	7
File Size	313245
File Format	PDF
ISSN	00189456
Volume Number	58
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Laboratories Voltage Power measurement Mechanical variables measurement Josephson effect Coils Virtual manufacturing Phase measurement Electrical resistance measurement Magnetic field measurement watt balance Absolute gravimetry Avogadro's constant electronic kilogram International System of Units (SI) Planck's constant quantum Hall effect redefinition
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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