TAN Xiangyu1,SHAO Haiming2,LI Lingzhi3,LI Yan2,DING Zhiwen2
1. Yunnan EPRI, Kunming, Yunnan 650214, China
2. National Institute of Metrology, Beijing 100029, China
3. College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
Abstract：AC low current calibration is always a difficult problem in AC testing field. The common testing methods in research and production field were analyzed, and the advantages and disadvantages of each method were analyzed. A new method based on AC comparator was put forward, and the AC low current was then traced to mA level alternating current. The calibration device was also developed. By carrying out a series of contrast test, the proposed method extended the measuring capability of alternating current to 1μA (10Hz~10kHz) with the accuracy of 0.05%.
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2024, Vol. 45 
