力的合成与示波器波形

Composition of Foces and Waveform of Oscillograph

示波器为什么会显示出与被测信号相同的波形？很多书中采用“立几中的投影原理”阐述。本文把电子束看成点电荷，在两对偏转板（x，y）作用下，即受到xy两个方向电场作用。分析点电荷在电场中受到垂直方向（y），水平方向（x）的力而产生合力。在合力方向运动，其运动轨迹与被测信号波形相同。

Why does oscillograph display the same waveform as the signal measured? ln many books,it is expounded hy adopting the principle of projeetion of solid geometry.In this essay,we look electron beam as point electric charge,hecause of the action of two pairs of deflect board (X,Y),that is electric field deflected of two directions (X,Y).point electron eharge is deflected of resultant of forces of force of two directions ,it moves in the direction of resultant of forces,and its moving track is sindlar to the signal waveiorm that is measured.