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| Research on AC Power Measurement System and Method Based on Josephson Quantum Voltage |
| JIA Zheng-sen, WANG Lei, XU Xi-tong, ZHOU Tian-di, PAN Xian-lin, SHI Zhao-min, ZHANG Jiang-tao |
| National Institute of Metrology, Beijing 100029, China |
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Abstract An AC power differential measurement system was designed based on the Josephson quantum voltage standard.By analyzing the error distribution and error transfer function of the differential sampling system, the sampling switching differential measurement method was proposed, which reduced the gain error of the differential sampling system and improved the accuracy of voltage amplitude measurement.By analyzing the attenuation coefficient η, it was proved that it is easy to realize voltage amplitude measurement of 10-7 magnitude by using switching differential measurement.By evaluating the zero phase of the differential sampling system, the results showed that the differential sampling system has better phase measurement stability.The uncertainty component of the AC power differential measurement system was analyzed, and the power measurement uncertainty of the power factor of 1.0, 0.5L and 0.5C was evaluated. Through the experimental comparison with the AC power national reference instrument, the rationality of the power measurement of the AC power measurement system based on Josephson quantum voltage was proved.
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Received: 17 October 2019
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2020, Vol. 41 
