配低阻电阻传感器的惠斯登电桥,若采用直流电压源激励,则由于极化作用和传感器的热电效应的影响,电桥输出信号将有误差。而且,用于电桥的直流信号放大器必须克服像偏移电压、漂移和泄漏电流等问题。本文介绍一种利用双向恒流方波源激励电桥的新方法。由于恒流源本身具有短路保护特点,所以这种方 Wheatstone bridges with low resistance sensors, if excited by a DC voltage source, will have errors in the bridge output due to polarization and the thermoelectric effect of the sensor. Furthermore, DC signal amplifiers for bridges must overcome issues like offset voltage, drift and leakage current. This article describes a new method of using a bidirectional constant current square wave excitation source bridge. Since the constant current source itself has the characteristics of short circuit protection, so this side