本文研究了对宽束和细束阴极透镜普遍适用的电磁复合聚焦球面阴极透镜的象差理论。
In the present study, an aberration theory for both wide and narrow electron beams in a combined electromagnetic focusing spherical cathode lens system is discussed.
电机控制器和软件也可以驱动Z轴或聚焦电机， 聚焦电机可以安装到最新显微镜的细调旋钮上。
The motor controller and software can also drive an optional Z axis or focus motor which can be fitted to the fine focus knob of most of the newer microscopes.
电机控制器和软件也可以驱动Z轴或聚焦电机， 聚焦电机可以安装到最新显微镜的细调旋钮上。
The motor controller and software can also drive an optional Z axis or focus motor which can be fitted to the fine focus knob of most of the newer microscopes.
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