Watt balance
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 The NIST watt balance; the vacuum chamber dome, which lowers over the entire apparatus, is visible at top |
A watt balance is an experimental electromechanical weight measuring instrument that measures the weight of a test object very precisely by the strength of an electric current and a voltage. It is being developed as a metrological instrument that may one day provide a definition of the kilogram unit of mass based on electronic units, a so-called "electronic kilogram". The name watt balance comes from the fact that the weight of the test mass is proportional to the product of the current and the voltage, which is measured in units of watts.
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| Joshua P. Schwarz, Ruimin Liu, David B. Newell, Ri... Joshua P. Schwarz, Ruimin Liu, David B. Newell, Richard L. Steiner, Edwin R. Williams, Douglas Smith "Hysteresis and Related Error Mechanisms in the NIST Watt Balance Experiment" (August 2001) nvl.nist.gov/pub/nistpubs/jres/106/4/j64schw.pdf - Web |
| Bureau International des Poids et Mesures Bureau International des Poids et Mesures www.bipm.fr/en/scientific/elec/watt_balance/ - Web |
| Swiss Federal Office of Metrology Swiss Federal Office of Metrology www-optics.unine.ch/.../Watt_balance.html - Web |
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