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在修理动圈仪表的过程中,仪表示值超差是一种常见故障,一般可通过改变磁分流片的工作位置或改变与动圈串联的电阻R_串来完成调整。下面根据其测量原理,对仪表示值误差的调整作一简单的剖析。动圈仪表的测量是利用在磁场中的线圈有电流流过时产生的转动力矩与张丝扭曲而产生的反作用力矩相平衡时,动圈将有一稳定的偏转角度α,从而指示出被测量的大小。电流I流入动圈在磁场中产生的偏转力矩M_1为: M_1=S·B·n·I (1)式中S——动圈的有效面积; B——空气隙中的磁感应强度;
In the process of repairing moving coil instrument, it is a kind of common fault that the instrument indicates the value of tolerance. Generally, the adjustment can be done by changing the working position of the magnetic flux divider or changing the resistor R_ string in series with the moving coil. The following according to its measurement principle, the meter indication error adjustment for a simple analysis. Dynamic measuring instrument is the use of magnetic field in the coil current flow through the torsion moment generated by twisting and torsion of the reactionary torque phase equilibrium, the dynamic will have a stable deflection angle α, which indicates the measured size . Current I into the moving coil in the magnetic field generated by the deflection torque M_1 is: M_1 = S · B · n · I (1) Where S - moving coil effective area; B - air gap magnetic induction;