实验四热敏电阻温度特性实验

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,实验四 热敏电阻温度特性实验,一、实验项目名称：,热敏电阻温度特性实验,二、实验目的：,学习用惠斯通电桥测量电阻；,了解热敏电阻的电阻温度特性，掌握其测定方法。,三、实验设备及配套软件：,热敏电阻、惠斯通电桥、检流计、稳压电源、功率调节器、电炉、水银温度计、烧杯、蒸馏水,四、实验原理：,半导体热敏电阻的温度与阻值的关系为：,热敏电阻的温度系数：,注意事项：,温度 T,升温R,0,倍率,降温R,0,倍率,T=20,5003,0.1,4990,0.1,T=25,4210,0.1,4200,0.1,T=30,3573,0.1,3560,0.1,T=35,3060,0.1,3050,0.1,T=40,2600,0.1,2600,0.1,T=45,2240,0.1,2240,0.1,T=50,1940,0.1,1940,0.1,T=55,1680,0.1,1680,0.1,T=60,1450,0.1,1460,0.1,T=65,1270,0.1,1260,0.1,T=70,1120,0.1,1120,0.1,T=75,990,0.1,990,0.1,T=80,870,0.1,880,0.1,T=85,770,0.1,780,0.1,原始数据记录表：,T(K),R,t,均值,1/T,lnR,t,T=273+20,499.60,0.00341,6.210,T=273+25,420.50,0.00336,6.040,T=273+30,356.60,0.00330,5.877,T=273+35,305.50,0.00325,5.722,T=273+40,260.00,0.00319,5.560,T=273+45,224.00,0.00314,5.412,T=273+50,194.00,0.00310,5.268,T=273+55,168.00,0.00305,5.124,T=273+60,145.50,0.00300,4.980,T=273+65,126.50,0.00296,4.840,T=273+70,112.00,0.00292,4.718,T=273+75,99.00,0.00287,4.595,T=273+80,87.50,0.00283,4.472,T=273+85,77.50,0.00279,4.350,计算结果表：,比较两种方法分别算出50摄氏度时的温度系数,半导体热敏电阻的温度与阻值的关系：,A、B为待定常数,为了能变成直线形式，两边取对数：,令：,则直线方程为：,以变量,x、y,分别为横轴和纵轴做图，为一直线。,