Uncertainty improvements of the NIST electronic kilogram

被引：105
|
作者：
Steiner, Richard L. [1 ]
Williams, Edwin R. [1 ]
Liu, Ruimin [1 ]
Newell, David B. [1 ]
机构：
[1] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA
来源：
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 2007年 / 56卷 / 02期
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;
D O I：
10.1109/TIM.2007.890590
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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.
引用
收藏
页码：592 / 596
页数：5
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