研究目的
To better characterize the digital bridge at ac resistance comparisons, especially with standards of different nominal values.
研究成果
The study confirmed the metrological agreement between the impedance bridges for 1 k? and 10 k? at 1 kHz. Future work aims to extend this comparison to the 10 ? and 100 ? range and other frequencies, comparing these results with the ICD measurements to reduce uncertainty for lower ac resistance calibrations.
研究不足
The digital bridge has limitations due to the digitizer resolution and linearity, source stability, and the amplifiers' maximum output currents, especially for measuring ac resistances below 10 ? with currents above 50 mA.
1：Experimental Design and Method Selection:
The study compares the performance of a four-terminal-pair coaxial bridge and a digital bridge for ac resistance measurements.
2：Sample Selection and Data Sources:
A set of ac standard resistors of 100 ?, 1 k?, and 10 k? were used, with a 1 k? resistor traceable to quantum Hall effect as the reference.
3：List of Experimental Equipment and Materials:
The four-terminal-pair coaxial bridge and the digital bridge (DigBrid) were the main equipment used.
4：Experimental Procedures and Operational Workflow:
Measurements were conducted at 1 kHz, focusing on deviations from the standard nominal value in μ?/?.
5：Data Analysis Methods:
The Normalized Error Ratio (NER) was used to confirm agreement between the bridges.
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