It is important to keep the bridge voltage low in order to avoid a self-heating of the measuring element by the bridge current. 保持电桥低电压很重要，以避免桥路电流测量元件自热。
For this purpose, the heating wires of each two measurement and reference chambers are switched to form a Whetstone bridge, which is heated by means of a bridge current. 在检测器内有两对加热的热丝即一对测量臂和一对参比臂，当通入桥路电流时，形成惠斯登电桥。
