The LNE has recently developed a 1 V programmable Josephson voltage standard specially dedicated to its transfer activities such as calibration of DC voltage references (Zener diode reference and Weston saturated standard cells) and digital voltmeters of high precision. This new programmable Josephson voltage standard allows the LNE to propose new calibration capabilities with reduced uncertainties while taking advantage of the simplicity to operate programmable Josephson array. The 1.018 V output voltage of the Zener diode reference can then be calibrated with a typical relative uncertainty of 80 nV (k = 2) in the framework of routine calibration services (an improvement by a factor 7). This paper describes the design of the new system and its metrological performances.

Key words

DC volltage standard
josephson effect
programmable josephson junction array
voltage calibration