A Compensation Method to Measure the Mutual Inductance at Low Frequency
Zhengkun Li, Zhonghua Zhang, Qing He, Yaqiong Fu, Jianting Zhao, Bing Han, Shisong Li, Jiang Lan, Chen Li · IEEE Transactions on Instrumentation and Measurement · 2011
Traditionally, the most precise way to get the mutual inductance value is by a Campbell calculable mutual inductor. Here, an approach of measuring the mutual inductance at low frequency with compensation method is described. A multi-channel direct digital frequency synthesis source is developed to provide stable and precise phase. The mutual inductance is traced to the value of the frequency and resistance directly. The measurement uncertainty is 0.43 ppm at present and could be improved further.