A Practical Microvolt Josephson Voltage Standard for Nanovoltmeter Measurement Based on Dual-Channel Josephson Junction Array

This paper describes the application of a microvolt Josephson voltage standard based on a dual-channel Josephson junction array developed at NIM. Using the microvolt Josephson voltage standard, DC voltage measurements ranging from 1 μV to 20 μV have been realized. And two different types of nanovoltmeters have been calibrated for non-linearity on 6 μV and 20 μV ranges. Results have demonstrated that the latest developed microvolt Josephson voltage standard is practical and can meet the requirement of low-level DC measurements.