Comparison of Josephson voltage standards held by the SISIR and the DFM

摘要

We have compared the Josephson array voltage standard (JAVS) held by the Singapore Institute of Standards and Industrial Research (SISIR) with that of the Danish Institute of Fundamental Metrology (DFM). The comparison took place in Singapore from 20-25 March 1995. A commercial Zener reference voltage standard was used as transfer instrument between the two laboratories. The result of the comparison was an observed difference of 13 nV with a combined uncertainty of 9 nV. The difference was independent of several measurement configurations used.