Calibration System for Zener Voltage Standards Using a 10 V Programmable Josephson Voltage Standard at NMIJ

• Published in: IEEE transactions on instrumentation and measurement Vol. 64; no. 6; pp. 1606 - 1612
• Main Authors: Maruyama, Michitaka, Iwasa, Akio, Yamamori, Hirotake, Shih-Fang Chen, Urano, Chiharu, Kaneko, Nobu-hisa
• Format: Journal Article
• Language: English
• Published: IEEE 01.06.2015
• Subjects: Arrays; Calibration; Current measurement; dc voltage; Josephson junction array; liquid helium; mechanical cooler; programmable Josephson voltage standard (PJVS); Semiconductor device measurement; Uncertainty; Voltage measurement; Zener voltage standard; mechanical cooler; dc voltage; Josephson junction array; programmable Josephson voltage standard (PJVS); Zener voltage standard; liquid helium; Calibration
• ISSN: 0018-9456; 1557-9662
• DOI: 10.1109/TIM.2015.2411998

We have developed a calibration system for the Zener voltage standards using a programmable Josephson voltage standard (PJVS) for liquid-helium consumption reduction and improvement in the calibration performance. The PJVS array is composed of 524288 niobium nitride (NbN)-based overdamped Josephson junctions and is cooled by a 10-K compact cooler. To verify the validity of the system, indirect and direct comparisons of the PJVS system and our conventional Josephson voltage standard system have been carried out. As a result, an agreement within a relative expanded uncertainty of 8.4 × 10 -10 was obtained for a nominal voltage of 10 V. We also discuss the uncertainty sources in the calibration of the Zener voltage standards using our PJVS system.