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一般示波器,当着示波管的亮度增加到一定的程度时,已调好聚焦的光点或扫线将要散焦。此现象多发生于示波管的亮度比较亮的时候,这就是所谓亮度对聚焦的影响。这一影响在早期的示波器中更为严重。当时主要的问题是,示波管电子枪内电极的相互位置按排和各电极的几何尺寸尚不够科学,致使当着示波管控制栅(G_1)的电压变化,使阴极的发射电子增加时,有少量电子被聚焦极(A_1)截获,造成 A_1极的电压变化,影响了原来已调好的聚焦。
General oscilloscope, in front of the brightness of the oscilloscope tube increased to a certain extent, the tune has been well focused spot or sweep will be defocused. This phenomenon occurs when the brightness of the CRT tube is relatively bright, which is the so-called brightness of the focus. This effect was even more severe in earlier oscilloscopes. At that time, the main problem was that the mutual positioning of the electrodes in the CRT gun was not scientific enough according to the geometry of the electrodes and the geometry of the electrodes, so that when the voltage of the CRT (G_1) changed and the emission electrons of the cathode increased, A small amount of electrons were intercepted by the focusing electrode (A_1), resulting in a voltage change on the A_1 electrode, affecting the originally adjusted focus.