研究目的
Investigating the voltage error associated with the leakage current of programmable Josephson voltage standards (PJVS) and presenting a method to measure and model the leakage current to ground for a given PJVS output voltage.
研究成果
The leakage current to ground in PJVS systems can be significantly reduced by upgrading components such as bias cables. Understanding the contributions of different elements to the leakage resistance to ground is crucial for improving measurement uncertainty. The leakage current must be measured independently for each PJVS output voltage, and the leakage resistance to ground serves as a good indicator of the worst-case scenario.
研究不足
The method is highly sensitive to perturbations (electrostatic fields and microphonic noise), limiting the overall relative accuracy to a few percent.
1：Experimental Design and Method Selection:
The study explores the effects of the complex leakage current paths of PJVS systems with a simple model and method to measure the leakage current to ground (LCG) for a given PJVS voltage. Two different methods to derive the equivalent leakage resistance to ground (LRG) of the entire system are presented.
2：Sample Selection and Data Sources:
The NIST PJVS system is used, with measurements taken at various PJVS output voltages.
3：List of Experimental Equipment and Materials:
Digital voltmeter (DVM), 2 kΩ resistor, custom-made Teflon isolated cables.
4：Experimental Procedures and Operational Workflow:
The LCG is determined by measuring the voltage drop across a 2 kΩ resistor when connecting either the low side or high side of the PJVS output leads to Earth ground potential. The voltage polarity of the PJVS is switched back and forth during measurement acquisition.
5：Data Analysis Methods:
The measured LCG versus PJVS voltage is analyzed to understand the leakage current paths and their contributions to the total LRG.
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