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In the context of the future definition of the mass unit, a promising approach is to link the kilogram to the Planck constant using, for example a watt balance. The Federal Institute of Metrology METAS is pursuing this route and is currently setting up a second version of the experiment. This METAS watt balance Mark II experiment is now assembled and ready for the first experimental tests. The design...
In the frame of the future redefinition of the International System of Units (SI), the unit of mass represents probably the biggest challenge. After the publication of the results from Mark I experiment, the effort is now concentrated on the development of the Mark II system. In this paper, we review the design and present the first tests of the individual components.
The METAS watt balance project has been in operation for 10 years. After different improvements and modifications, the present setup allows a reproducibility for a two weeks measurement series of 0.05 × 10-6 W/W. The analysis of several measurement campaigns is underway to produce a value of the Planck's constant h in the near future.
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