10-VOLT JOSEPHSON VOLTAGE STANDARD AT THE ETL

A voltage standard system using a 10 V Josephson junction array has be en developed, The uncertainty is 0.6 x 10(-8) for measurement of the 1 0 V output of a 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 measuremen ts of a 10 V output of a Zener, The result agreed within the uncertain ty (2 x 10(-8)) of the comparison, The 10 V output voltages of a Zener reference standard are measured consecutively by the 10 V array syste m.