The Design and Construction of the Joule Balance NIM-2.

To make contribution for the redefinition of the kilogram with the Planck constant, the National Institute of Metrology (NIM, China), proposed a joule balance method. The first prototype NIM-1 has been built to check the feasibility of the principle and a relative uncertainty of 2.6 × 10-6 has been achieved in 2014. To get a better result, since 2013, the second generation joule balance NIM-2 has ...