单臂电桥采用恒流源供电，这样电桥的输出不受温度的影响。单臂电桥检测出电阻的变化后，经过差分放大器，输出信号再经过电压电流的转换，变换成相应的电流，该电流信号通过非线性矫正电路的补偿，即产生与输入信号成线性关系的DC4~20mA标准输出信号。应力作用到半导体材料上，除会产生形变外，材料的电阻率亦随之而变。这种由于应力作用而使材料电阻率改变的现象称为压阻效应。
单臂电桥测温电路结构简单，但存在误差而难以实现高精度温度检测。
Although single-armed bridge circuit is easy to construct, but is not suitable for high precision temperature detection because of its inner error.
结合“单臂电桥测电阻”这个实验的特点提出了一个设计性实验，并给出了解决方案。
A designing experiment and the relative solution have been given combined with the characteristics of the resistance measurement experiment with Wheatstone bridge.
通过与单电桥相比，得出双电桥桥臂电阻与电桥灵敏度的关系，从而确定了双电桥桥臂电阻选择的原则。
Compared with single bridge, the relationship between the arm resistance of double bridge and its sensitivity can be determined. Therefore, the rule for selecting arm resistance is obtained.
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