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The National Institute of Standards and Technology (NIST) new watt balance (NIST-4) has been constructed for the realization of mass through an exact value of the Planck constant in the new International System of Units (SI). The total relative uncertainty goal for the instrument of a few parts in 108 requires the determination of the local acceleration of gravity, g, with parts in 109 accuracy at...
A new watt balance is being constructed at National Institute of Standards and Technology (NIST) in preparation for the redefinition of the International System of Units and the realization of mass through an exact value of the Planck constant. We describe the procedures used and give results for the measurements of the local acceleration of gravity in the new watt balance facility.
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