采用双阻性元件与四导线的电阻压力传感器广泛用于各种压力监控应用。当压力升高时,一只电阻的阻值增加,另一只电阻则下降。用电阻传感器做精确的测量需要补偿线路电阻产生的损耗,尤其是当线路长度达到数十米时。本例中补偿方式的基础是导线有相等的电阻:RL1=RL2=RL3=RL4=RL(图1)。 Resistive pressure sensors with dual resistive elements and four conductors are used in a wide range of pressure monitoring applications. As pressure increases, the resistance of one resistor increases, while the other decreases. Making accurate measurements with a resistive sensor requires compensation for the losses caused by the line resistance, especially when the line length reaches tens of meters. The compensation method in this example is based on the wires having the same resistance: RL1 = RL2 = RL3 = RL4 = RL (Figure 1).