At the Swiss Federal Office of Metrology and Accreditation (METAS) a quantum primary standard of capacitance based on single electron tunneling devices is under development. In this paper we report on the progress made so far as well as on the current work towards the realization of this standard

Various operational parameters of two different I-V binary programmable Josephson arrays are evaluated and compared within different Josephson array voltage standard (JAVS) set-ups at microwave frequencies around 70 GHz. For this purpose, the investigation of the electrical characteristics of a SINIS-type Josephson array and of an externally shunted SIS-type Josephson array is under way at ten national metrology institutes. The results of the measurements are presented and discussed.