For DC current measurement, a current shunt is place in series in the current path and convert the current to a DC voltage signal.
对于直流电流测量﹐在电流通道串联一电流分流器﹐将电流转换成直流电压信号。
Simultaneously, the second order notch filter and low-pass filter are designed to filter the second order rippled DC voltage signal.
同时，设计了用于牵引逆变器控制的二次数字陷波器以及低通滤波器滤除直流电压信号的二次脉动。
For capacitive sensing, driving signal with DC bias voltage and ac voltage is usually necessary for the measurement of capacitance.
对电容式加速度计，为测量其电容的变化，通常需要带直流偏置的交流电压信号来驱动。
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