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与热电阻或其他能产生电阻值变化的传感器配套使用的XC Z T—□□2型动圈仪表(以下简称XC-22型仪表)采用不平衡电桥测量线路,原理如图1所示。图中R_1、R_2、R_3和R_4为四个桥臂电阻,U_(ab)为桥路外加电压。R_g为桥路对角线c、d间电阻,通过R_g的不平衡电流I_g为: 设计上使桥臂电阻R_3=R_4,令R_gR~2_3=K_0,R_g+2R_3=K_1,R_gR_3+R~2_2=K_2,则上式可写成:
XC Z T □□□ 2 type dynamic coil instrument (hereinafter referred to as XC-22 type instrument) which is used with thermal resistance or other sensors that can produce the change of resistance value adopts the unbalanced bridge measurement circuit. The principle is shown in Fig.1. Figure R_1, R_2, R_3 and R_4 for the four arm resistance, U_ (ab) for the bridge applied voltage. R_g for the bridge diagonal c, d resistance, R_g through the unbalanced current I_g is designed to bridge arm resistance R_3 = R_4, so that R_gR ~ 2_3 = K_0, R_g + 2R_3 = K_1, R_gR_3 + R ~ 2_2 = K_2, then the above equation can be written as: