A changed temperature lead to the change of value of the thermistor, then the bridge balance broke up, which induced the change of current value to the microammeter.
温度的变化引起热敏电阻阻值的变化，从而使电桥失去平衡，引起流过微安表的电流发生变化。
2
In the studying of the specific property of the diode, the zero drift of the microammeter is caused by electromagnetic wave, and it has great effects on the result of the measure.