期刊
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
卷 56, 期 2, 页码 592-596出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2007.890590
关键词
absolute watt; electromagnetic induction; electronic kilogram; International System of Units (SI); mass measurement; measurement units; motion measurement; power units; resistance measurement; voltage measurement; watt balance
This paper summarizes the latest uncertainty improvements and data for a new result from the National Institute of Standards and Technology (NIST) electronic kilogram experiment. The result of 8 +/- 36 nW/W for the ratio {W-90/W - 1}, as well as the Planck's constant, is comparable to the NIST 2005 value but with a lower uncertainty. Of the eight largest Type B uncertainty contributions, gravity acceleration, wheel surface, and reference mass magnetic susceptibility are considerably reduced. Humidity dependence in the recent data and limitations on the volt/velocity signal analysis are now the main limitations on the uncertainty.
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