Ten-volt Josephson junction array voltage standard at ETL

A voltage standard system using a 10-V Josephson junction array has been developed. The uncertainty is 0.6/spl times/10/sup -8/ for measurement of the 10-V output Zener diode reference standard. A comparison of the 10-V array system with the conventional 10-V measurement system composed of a 1-V array and a voltage divider was performed through measurements of a 10-V output of a Zener. The result agreed within the uncertainty (/spl sim/1/spl times/10/sup -8/) of the comparison.