开尔文电桥的介绍
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开尔文电桥又称“双臂电桥”。测量10^(-6)~10^2欧姆低电阻的直流电桥。图中r是跨线电阻（包括rx、rs两电阻器间的接线电阻、接触电阻及内部连接线电阻），rs是标准电阻。当调节r1、r2、r3、r4和rs使桥路中无电流（即灵敏电流计g的指针不偏转）时，将有下列平衡条件成立：r1r2=r3r4和rx=r1r2rs。rx的计算式与r无关，从而可减小接线电阻和接触电阻所产生的误差。
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