双臂电桥的测量方法和注意事项

2025-04-06 18:55:01
推荐回答(1个)
回答1:

(1)使用方法
直流双臂电桥是专门测量低电阻的电桥,在使用直流双臂电桥时,除了遵守直流单臂电桥的使用步骤外,还应注意由于双臂电桥有P1,P2,C1,C2四个被测电阻接线端,其中,P1、P2称为电位端,C1、C2称为电流端,则被测电阻Rx应与电桥的电压端和电流端正确连接。被测电阻的电流端钮应接电桥的C1、C2,电压端钮应接电桥的P1、P2。若被测电阻没有专门接线,应设法使每端引出两根线,分别接电压端和电流端,而且引线应尽量短而粗,接触要良好。电压接头应比电流接头更靠近被测电阻Rs,测量时操作要快。
(2)注意事项
①电桥与被测电阻的连接有四根引线,电流接头和电位接头应正确连接,不能将P和C两个头绞在一起,接线时要使电位接头靠近被测电阻。
②直流双臂电桥工作时电流较大,要求电源的容量大,因此可使用外接电源。测量时操作要迅速,以免电池耗电过大。测量0.1Ω以下的电阻值时,按钮B应间歇使用。测量结束后应立即关断电源。

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