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车载PPI显示器示波管的屏蔽罩,不仅要求有良好的屏蔽性能,而且还要求能保护和固定管子,起到抗振防冲的作用,同时又要求安装和调整方便。根据示波管的屏蔽原理得知,其电子枪部分最易受外来磁场干扰,而安装偏转线圈的部分,因其本身磁场强,故不易受干扰,但由它产生的漏磁反过来会干扰其它电路。另外,从锥体到荧光屏的一段,由于电子束得到加速,所以受干扰比较小。据此,我们
The PPI display oscilloscope shield, not only requires good shielding performance, but also required to protect and fix the tube, play a role in anti-vibration and anti-shock, but also requires easy installation and adjustment. According to the shielding principle of the oscilloscope, the part of the electron gun is the most susceptible to interference from external magnetic field. However, the part where the deflection yoke is installed is not easily disturbed due to its strong magnetic field, but the magnetic flux leakage generated by it will in turn disturb other Circuit. In addition, the section from the cone to the screen, due to the electron beam is accelerated, so the interference is relatively small. According to this, we