Comparison of the Josephson voltage standards of the NMC, ASTAR and the BIPM (part of the ongoing BIPM key comparisons BIPM.EM-K10.a and BIPM.EM-K10.b)

A comparison of the 10 V and 1 V Josephson array voltage standards of the Bureau International des Poids et Mesures (BIPM) was made with those of the National Metrology Centre (NMC), A*STAR, Singapore, in September 2010. For this exercise, option B of the comparison protocol was applied for the two voltages. The BIPM provided a reference voltage for measurement by the NMC, A*STAR using its Josephson standard with its own measuring device (option B of the comparison protocol). The BIPM array is floating from ground. The final results are in very good agreement within the combined relative standard uncertainty of 9.6 parts in 10... and 0.9 parts in 10... for the nominal voltages of 10 V and 1.018 V respectively. (ProQuest: ... denotes formulae/symbols omitted.)