Portable Comparison Standard Based on the Josephson Effect

A comparison standard is developed in the form of a small voltage standard based on the Josephson effect whose metrological characteristics make it possible to compare stationary voltage standards with uncertainty less than 10^–9. The standard was used in key comparisons of national voltage standards within the framework of Euromet Project N 723.__________Translated from Izmeritelnaya Tekhnika, No. 2, pp. 48–51, February, 2005.