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

页码：592 / 596

页数：5