用冲击电流计测直螺线管磁场实验的误差理论分析

Theory Analysis on Error in the Experiment of Measuring Magnetic Field in Straight Solenoid by Impact Galvanometer

根据冲击电流计测直螺线管磁场的实验电路原理,利用数值计算方法,对减少测量的系统误差进行了理论分析.得出如下结论:选择适当的仪器和回路的电阻使标准激励回路与待测激励回路的脉冲电流时间常数相近可以很好地减少系统误差.

According to circuit principle of the experiment of measuring magnetic field in straight solenoid by impact galvanometer, theory analysis on reducing system error is done by using numerical method. Because of the appropriate selection of the equipment and resistance in circuit, time constants in standard circuit and those in pulse circuit are nearly the same, thus system error can be deduced.