Combined with the problems during the experiment, design a improved testing circuit of Direct Current Attenuation Method.
结合试验过程中遇到的问题，给出了改进的直流衰减法测试电路。
The experiment on measuring the direct current by optical method shows a favorable linear relationship between the current and the detective signal.
对直流电流传感信号的检测实验表明，被测电流与检测信号之间存在良好的线性。
The phenomenon of a pulsating direct current in demonstrative experiment of hand alternator is founded and the reasonable explanation is presented.
发现了手摇交流发电机演示实验中出现脉动直流电的奇异现象并对此作出了合理的解释。
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