Impedance measurement circuit based on improved voltage vector ratio method
Kai Wang, Shunjiang Wang, Yue Zuo, Xingcai Wang, Ming Yu Gao · IOP Conference Series Earth and Environmental Science · 2021
Abstract China’s inductance value is traced back to the national inductance working base. In addition, in China’s electromagnetic metrology standard system, the inductance working standard can only be traced back to the source at 1kHz. The values at other frequencies are obtained after frequency conversion according to the distribution parameters of the inductance reference. The most accurate digital bridge is the 1689MRLC digital bridge, with impedance measurement accuracy of 0.02%, d and q measurement accuracy of 0.0001, and programmable test from 12Hz to 100kHz. Since the researchers need to work on the benchmark to ensure that the transmission capacity reaches 0.01% in the broadband (50 Hz-2.5 kHz), the measurement system needs to be redesigned.