轴线

$ x\ /\ mm$ $+I_S\ ,\ +I_M$ $+I_S\ ,\ -I_M$ $+I_S\ ,\ -I_M$ $+I_S\ ,\ -I_M$ $U_H = \frac{\mid\ U_1\ -\ U_2\ +\ U_3\ -\ U_4\ \mid}{4}/mV$ $B = \frac{U_ ......