ALIGNMENT UNCERTAINTIES OF THE NIST WATT EXPERIMENT

Authors
GILLESPIE AD FUJII K NEWELL DB OLSEN PT PICARD A STEINER RL STENBAKKEN GN WILLIAMS ER
Citation
Ad. Gillespie et al., ALIGNMENT UNCERTAINTIES OF THE NIST WATT EXPERIMENT, IEEE transactions on instrumentation and measurement, 46(2), 1997, pp. 605-608
Citations number
5
Categorie Soggetti
Engineering, Eletrical & Electronic","Instument & Instrumentation
Journal title
IEEE transactions on instrumentation and measurement → ACNP
ISSN journal
00189456
Volume
46
Issue
2
Year of publication
1997
Pages
605 - 608
Database
ISI
SICI code
0018-9456(1997)46:2<605:AUOTNW>2.0.ZU;2-D
Abstract
The effects of alignment uncertainties of the NIST watt balance with r espect to local gravity and the magnetic flux density of the balance h ave been analyzed. Techniques for measuring all quantities relevant to misalignment have been developed. The components of the relative comb ined standard uncertainty of the measured value of the watt due to ali gnment uncertainties have been reduced to 20 nW/W, and potential impro vements in the balance design have been identified which could ultimat ely lead to a reduction of that uncertainty to below 10 nW/W.