两种形式的输出幅度可以通过改变直流电源电压或通过改变脉冲宽度(脉宽调制pwm)来控制。
Output amplitude in both modes can be controlled by varying the DC source voltage or by varying the pulse-width (pulse-width modulation, PWM).
若达到同样的引出时间，共振频率的交流电压的幅度可比直流电压值小一个量级。
To achieve the same extraction time, the amplitude of the ac voltage in the resonance frequency can be less than that of the DC voltage with one order of magnitude.
数字万用表（DMM）只能测量直流和几十到几百赫兹的低频正弦信号幅度，不能测量高频信号和信号的频率。
On usual DMM only can measure signal's amplitude of DC and AC from fifty to five hundred Hz, it can not measure signal's frequency or amplitude of high frequency.
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