自组惠斯登电桥测热敏电阻实验探讨

在大学物理实验课中开设惠斯登电桥测热敏电阻的设计性实验,有利于激发学生的创新意识和动手能力。讨论了这一设计性实验的基本原理$实验仪器等,研究了热敏电阻阻值和温度的关系特性。实验结果表明,惠斯登电桥测得的热敏电阻的阻值比较准确,并且所测得的该种材料的热敏电阻在室温下的材料常数与其真实值很接近。

Study on wheatstone bridge measures a thermistor

Setting up the design experiment of wheatstone bridge measures a thermistor in college experimental physics is activate students＇ creation consciousness and practicing ability. The fundamental principle and devices of this design experiment are discussed, and the relationship between the effect of resistance value of thermistor and temperature is studied. The experimental results indicate that the wheatstone bridge measures of the resistivity of the thermistor is more accurate, and the thermistor of the kind＇s material constant under the indoor temperature is close to the true value.