Evaluation of Low-Frequency Characteristic of a Thermal Converter Using Programmable Josephson Voltage Standard

• Published in: IEEE transactions on instrumentation and measurement Vol. 59; no. 11; pp. 2930 - 2935
• Main Authors: Sasaki, H, Yamamori, H, Yamada, T, Fujiki, H, Shoji, A, Budovsky, I, Shimizume, K
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-11-2010; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Ac-dc transfer; Analog-digital conversion; Australia; Converters; Devices; Electric potential; Electrical equipment industry; Frequency conversion; Instrumentation; Isolation technology; Joining; Joining processes; Josephson array; Metrology; Resistance heating; Standards development; thermal converter; Voltage; Voltage converters; voltage standard; Waveforms
• ISSN: 0018-9456; 1557-9662
• DOI: 10.1109/TIM.2010.2047126

We are developing a programmable Josephson voltage standard (PJVS) system based on a compact cryocooler. The system is capable of generating two arbitrary waveforms by use of a dual-output PJVS (DO-PJVS) device. Owing to this dual-output feature of the PJVS system, the low-frequency characteristic in the ac-dc transfer difference of a thermal converter has been investigated using the 90° addition method. The evaluation of the low-frequency characteristic of a thermal converter is of great importance for connecting conventional ac-dc transfer standards and new Josephson-based ac voltage standards. To fulfill this purpose, a dual-heater thermal voltage converter (DH-TVC) with improved low-frequency performance has been developed. The low-frequency ac-dc transfer difference of the DH-TVC was evaluated to be smaller than 1 μV/V at frequencies of as low as 1 Hz.