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The development of the joule balance method to measure the Planck constant,in support of the redefinition of the kilogram, has been going on at theNational Institute of Metrology of China (NIM) since 2007. The first prototypehas been built to check the feasibility of the principle. In 2011, the relativeuncertainty of the Planck constant measurement at NIM is $7.7\times10^{-5}$.Self-heating of the coils, swing of the coil, are the main uncertaintycontributions. Since 2012, some improvements have been made to reduce theseuncertainties. The relative uncertainty of the joule balance is reduced to$7.2\times10^{-6}$ at present. The Planck constant measured with the joulebalance is $h=6.6261041(470)\times10^{-34}$Js. The relative difference betweenthe determined h and the CODATA2010 recommendation value is $5\times10^{-6}$.Further improvements are still being carried out on the NIM-1 apparatus. At thesame time, the design and construction of a brand new and compact joule balanceNIM-2 are also in progress and presented here.

The Improvement of Joule Balance NIM-1 and the Design of New Joule Balance NIM-2