摘要
介绍了一种宽量程范围的交流电流测试仪的工作原理及设计方法．该仪器采用双级电流互感器作为电流分流器，采用对数-反对数放大器实现交流电流真有效值转换，采用超线性度模／数转换器实现数字采样．实验结果表明，在45—65Hz频率范围内实现了线性度达到0．02％交直流有效值的测量．
The principle and design method of alternating current testing instrument with wide rang is introduced. In this instrument, two-stage current transformers are used as current shunt, logantilog amplifiers are used to perform true rms-to-dc conversion, and rms voltage is sampled by ultra-linear analog to digital converter. There is not any adjustable element in the circuit because of advanced auto-calibration introduced. Experimental results show that the linearity of rms-to-dc conversion is up to 0.02% in the range from 45 Hz to 65 Hz.
出处
《上海电力学院学报》
CAS
2008年第2期107-110,共4页
Journal of Shanghai University of Electric Power
基金
上海市科学技术委员会地方高校能力建设项目(071605125)
关键词
真有效值
双级电流互感器
模数转换
true root-mean-square
two-stage current transformers
ADC
