推荐回答（2个）
热敏电阻阻值随温度变化的曲线呈非线性，而且每个相同型号的线性度也不一样,所以测试起来很麻烦，建议你在特定温度 用恒流法测 可以适当的加单片机
热敏电阻阻值测量原理
本设计采用电流法测量热敏电阻的阻值。电流法测量热敏电阻的基本原理是用恒流源I给待测热敏电阻R提供电流，如图 ，待测热敏电阻两端的电压U会随着热敏电阻阻值的大小而发生变化，其电压U=RI
从而可以知道R=U/I
因为我们采用的是恒流源I，所以1/I是已知量，当我们测得热敏电阻两端电压U后，再除以恒流源I即可得到热敏电阻的大小。恒流源的精度决定了电流法的测量精度。
为了更容易的完成上述测量并实现量程的校准我们可以在电路中加入单片机。其基本原理图如下
M1、M2 ：多路模拟开关
I ：恒流源输出的标准电流
R0 ：被测电阻
R1 ：标准电阻
A：放大器
A/D：A/D转换装置
U0：被测电阻R0两端的被测电压信号
U1：标准电阻R1两端的标准电压信号
K：采样时放大转换通道的等效转换系数
标准电阻R1 选用锰铜丝绕制而成，其特点是：温度性能特别好而且阻值稳定。所以我们可以认为U1=I·R1为已知量，在放大、A/D转换通道测量上限校准（量程校准），标准电阻R1 等于被测电阻R0的上限值。设U0、U1对应的A/D采样值分别为S0、S1，由单片机控制，使P1.0=1，M1的通道IN1可以导通，电流I流过标准电阻R1 ，有
U1=I·R1
同时，使P1.1=1，M2通道IN1导通时，可得到
S1=K·U1=I·R1
当P1.0=0时，M1通道IN0导通，恒流源电流I流过被测电阻R0，可得
U0=I·R0
让P1.1=0，M2通道IN0导通，可得
S0=K·U0=I·R0·K
所以，S0/S1=R0/R1
由此，R0=S0/S1·R1
根据公式，其中标准电阻是已知的，单片机对U0、U1采样得到S0、S1就可以计算出被测电阻R0的大小。本测量方法采用了与标准校准信号采样值比较的方法，使被测电阻的大小只与标准电阻R1、标准校准信号的采样值S1、被测信号的采样值S0有关，与其他因素无关。减少了对恒流源精度要求的限制，同时提高了测量精度，实现了高精度的电阻值测量。这些是单片机电流法测量电阻的最大优点，其中其测量精度主要取决于A/D转换器的分辨率。所以该方法只要把握好A/D转换器的分辨率就可以做到精确测量电阻阻值。
电磁炉热敏电阻好坏判断及如何测量？方法简单实用，值得收藏
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