A transfer device for 10-V Josephson array measurements

To improve measurements of 10-V Zener-based standards, we have designed a new transfer voltage source for use with 10-V Josephson arrays. The transfer voltage is compared, in turn, with that of the Zener standard and that of the array. The use of two separate circuits helps solve the problem of common ground connections and prevents noise from the Zener standard entering the array circuit. This transfer device, which has also been used for 10-V Josephson array comparisons, may be used for other applications