Direct 10 V Josephson Voltage Standard comparison between a programmable sinis array and a conventional sis array

In December 2007, a comparison of the 10 V Josephson Array Voltage Standard (JAVS) of the LNE was performed with that of the BIPM in the framework of BIPM.EM-KlO.b comparison. During the week allotted to the exercise, the measurement setup was optimized to achieve a relative voltage difference of 7times10
^-12
within a relative Type A uncertainty of 8times10
^-12
. We then took the opportunity to carry out a direct comparison of a 10 V PTB programmable array against the LNE JAVS. We report on the experiments performed to establish the uncertainty budget. We present the characterization of a 10 V SINIS array. We conclude with the results of a direct comparison against the LNE JAVS.