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实验结果表明，该方法与传统的利用机械电位器调节电阻方法相比，过程简单，误差小。
The tested results show that this method compared with the traditional method of using mechanical potentiometers changing resistance is easier in process and smaller in error.
频率通过用可编程器件EPLD控制，而脉冲信号的宽度和幅度通过多路模拟开关和数字电位器调节。
The pulse frequency can be selected by EPLD. The voltage amplitude and pulse width of analog pulse can be adjusted by analog switches and digitally controlled potentiometers.
使用时仅需外配一只电位器既可实现交流电功率调节，在许多应用场合中可代替笨重的接触式调压器。
It just needs one potentiometer additionally to realize ac power regulation during being used, this product could take the place of heavy contacting voltage-regulator under most circumstances.
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