给万用示教电表加一个测温档,可弥补水银温度计的缺陷。一、测温原理将万用示教电表的转换开关拨至电阻档(一般是是R×100),接上一只热敏电阻,可测出热敏电阻的电阻值.当温度升高时,热敏电阻阻值减小,电表指针的偏转情况反映了热敏电阻感受的温度.因此,如果在相应的电阻值处标上温度,则万用示教电表电阻档配合上热敏电阻后可以直接测温. Adding a temperature measurement file to the universal teaching meter can make up for the defect of the mercury thermometer. First, the principle of temperature measurement will be universal teaching electric meter switch to the resistance file (usually R × 100), connected to a thermistor, you can measure the resistance of the thermistor. When the temperature increases The resistance of the thermistor is reduced, and the deflection of the meter pointer reflects the temperature sensed by the thermistor. Therefore, if the temperature is marked at the corresponding resistance value, then the universal teaching meter resistance file is matched with the thermistor. Can directly measure temperature.