Title :
Upgrading the NIST electronic kilogram system
Author :
Steiner, R. ; Haddad, D. ; Liu, R. ; Perl, E.
Author_Institution :
Nat. Inst. of Stand. & Technol. (NIST), Gaithersburg, MD, USA
Abstract :
The electronic kilogram project at the National Institute of Standards and Technology is upgrading several major subsystems to improve the operational reliability of the watt balance system and lower the uncertainty of results for the Planck constant, h. These include a picosecond time interval analyzer, piezo motor coil tilt control, lock-in AC signal coil transverse-position detection, fiber-optic standard frequency distribution, and a dry vacuum pumping system.
Keywords :
balances; coils; constants; mass measurement; measurement uncertainty; units (measurement); vacuum pumps; NIST; National Institute of Standards and Technology; Planck constant; dry vacuum pumping system; electronic kilogram system; fiber-optic standard frequency distribution; lock-in AC signal coil transverse-position detection; measurement uncertainty; operational reliability; picosecond time interval analyzer; piezomotor coil tilt control; watt balance system; Coils; Control systems; Equations; Instruments; Magnetic fields; NIST; Steel; System testing; Vacuum systems; Voltage;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2010 Conference on
Conference_Location :
Daejeon
Print_ISBN :
978-1-4244-6795-2
DOI :
10.1109/CPEM.2010.5543359
