Steiner, R.
, Newell, D.
and Williams, E.
(1999),
A Result from the NIST Watt Balance and an Analysis of Uncertainties, IEEE Transactions on Instrumentation and Measurement, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=11025
(Accessed September 15, 2024)
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A Result from the NIST Watt Balance and an Analysis of Uncertainties
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Author(s)
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Abstract
An improved determination of the ratio of power, measured in terms of the Josephson and quantum Hall effects, and also the meter, kilogram, and second, has been completed. The result is expressed as: W90/W = 1 + (8187) x 10-9. This is an order of magnitude improvement from the last NIST (formerly NBS) determination. The Type A standard relative uncertainty (statistical) is 30nW/W, and the Type B relative standard uncertainty is 82 nW/W. Type B uncertainty components are listed and discussed within the context of experimental procedure descriptions. Improvements for the next version of this experiment, are also mentioned.Citation
IEEE Transactions on Instrumentation and Measurement
Volume
48
Issue
2
Pub Type
Journals
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Keywords
electron mass, fundamental constants, Josephson constants, kilogram, mass drift, Planck constant, Watt-SI
Citation
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Created March 31, 1999, Updated October 12, 2021