电桥测电阻式,应怎样选择比率臂旋钮 惠斯登电桥测电阻时,如何适当选择比率臂R1/R2

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电阻箱的读数刻度是固定的,倍率越大电阻实际值的较小位的阻值就读不出来了,一个电阻实际是12.5欧若用倍率为10欧就很不准了 。

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