单臂电桥原理 求单臂电桥的工作原理
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\u5219\uff1a Uac=Uad, Ucb=Udb
\u5373\uff1aI1R1=I4R4, I2R2=I3R3
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\u2234I1=I2\uff0c I3=I4
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R1R3=R2R4
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\u8bbe\u88ab\u6d4b\u7535\u963bRX\u662f\u4f4d\u4e8e\u7b2c\u4e00\u4e2a\u6865\u81c2\u4e2d\uff0c\u5219 RX=R2R4/R3
单臂电桥是惠斯顿平衡电桥，
R1、R2、R3、R4构成一电桥，A、C两端供一恒定桥压Us，B、D之间为有一检流计G，当平衡时，G无电流流过，BD两点为等电位，则：
UBC=UDC,I1=I4,I2=I3
下式成立：
I1R1=I2R2
I3R3=I4R4
由于R4=Rx，于是有
R4为待测电阻Px，R3为标准比较电阻，式中K=R1/R2，称为比率，一般惠斯登电桥的K有0.001、0.01、0.1、1、10、100、1000等。本电桥的比率K可以任选。根据待测电阻大小，选择K后，只要调节R3，使电桥平衡，检流计为0，就可以根据(1)式得到待测电阻Rx之值。
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