Title :
A measurement of the NBS electrical watt in SI units
Author :
Olsen, P. Thomas ; Elmquist, Randolph E. ; Phillips, William D. ; Williams, Edwin R. ; Jones, George R. ; Bower, Vincent E.
Author_Institution :
NBS, Gaithersburg, MD, USA
fDate :
4/1/1989 12:00:00 AM
Abstract :
The National Bureau of Standards (NBS) electric watt in SI units to be: WNBS/W=KW =1-(16.69±1.33) p.p.m. The uncertainty of 1.33 p.p.m. has the significance of a standard deviation and includes the best estimate of random and known or suspected systematic uncertainties. The mean time of the measurement is May 15, 1988. Combined with the measurement of the NBS ohm in SI units: ΩNBS/Ω=KΩ =1-(1.593±0.022) p.p.m., this leads to a Josephson frequency/voltage quotient of EJ=E0[1+(7.94±0.67) p.p.m.] where E0=483, 594 GHz/V
Keywords :
Josephson effect; power measurement; units (measurement); Josephson frequency/voltage quotient; NBS; National Bureau of Standards; SI units; measurement standards; ohm; random uncertainties; standard deviation; systematic uncertainties; watt; Coils; Current measurement; Electric variables measurement; Force measurement; Laboratories; Measurement standards; NIST; Power measurement; Time measurement; Voltage;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
