单臂电桥的工作原理是什么 什么是双臂电桥?什么又是单臂电桥?

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单臂电桥,其中测量电阻为一个桥臂,标准电阻为一个桥臂,两个桥臂间连接电流表,当测量电阻和标准电阻相同时,电流等于零,这时标准电阻的读数即为被测阻值。

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