交流正弦波电压使电极之间的电腐蚀，无稳定的检测。
AC sine-wave voltage between electrodes enables stable detection with no electric corrosion.
根据数字万用表的测试原理，提出了用其测量非正弦波电压平均值、有效值及峰值的简单实用的方法。
According to the principles of numeration table, the author puts forward simple but practical methods of how to measure the mean values, virtual values and peak values of non sine waves.
给出了正弦波逆变器的主电路结构，分析了控制电路及电压前馈的工作原理。
The structure of the sine wave inverter is given, the working principles of the control circuit and voltage feedforward are analyzed.
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