Title :
Measurement and reduction of alignment errors of the NIST watt experiment
Author :
Gillespie, A. ; Fujii, K. ; Newell, D. ; Olsen, P.T. ; Picard, A. ; Steiner, R. ; Stenbakken, G. ; Williams, E.
Author_Institution :
Nat. Inst. of Stand. & Technol., Gaithersburg, MD, USA
Abstract :
The effects of uncertainties in the alignment of the NIST watt balance with local gravity and the magnetic field of the balance have been analyzed, and techniques for measuring all misalignment parameters have been developed. The systematic uncertainty in the watt measurement due to alignment has been reduced to 0.04 /spl mu/W/W.
Keywords :
balances; inductors; light interferometry; mass measurement; measurement by laser beam; measurement errors; measurement standards; power measurement; weighing; NIST watt balance; alignment errors; induction loop; kilogram monitoring; local gravity; magnetic field; mass standard; misalignment parameters; reference laser beams; systematic uncertainty; uncertainties; watt measurement; Electric variables measurement; Force measurement; Interferometers; Laser beams; Magnetic field measurement; NIST; Position measurement; Velocity measurement; Voltage measurement; Wheels;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1996 Conference on
Conference_Location :
Braunschweig, Germany
Print_ISBN :
0-7803-3376-4
DOI :
10.1109/CPEM.1996.547376
