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Uncertainty Improvements of the NIST Electronic Kilogram

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4 Author(s)

This paper summarizes the latest uncertainty improvements and data for a new result from the National Institute of Standards and Technology (NIST) electronic kilogram experiment. The result of 8 \pm 36 nW/W for the ratio  {{W}_{90} /{W}- 1} , as well as the Planck's constant, is comparable to the NIST 2005 value but with a lower uncertainty. Of the eight largest Type B uncertainty contributions, gravity acceleration, wheel surface, and reference mass magnetic susceptibility are considerably reduced. Humidity dependence in the recent data and limitations on the volt/velocity signal analysis are now the main limitations on the uncertainty.

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Instrumentation and Measurement, IEEE Transactions on  (Volume:56 ,  Issue: 2 )