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Source text - English The cathode-ray tube in the receiver performs the opposite function to the camera tube in the transmitter, converting the electrical signal into an optical image. Fig. 1 shows in outline the action of the cathode-ray tube, where, for the moment, the deflecting and focusing arrangements are omitted. The electrical signal, which represents the picture, is applied to the control electrode, which functions in a manner similar to that of the control grid in a tube. The signal causes the potential of the control electrode to vary about a mean level, and as this goes more negative, it reduces the intensity of the electrode to vary about a mean level, and as this goes more negative, it reduces the intensity of the electron beam, with a resulting reduction in the brightness of the spot formed on the fluorescent screen. Likewise, as it goes less negative, it increases the brightness of the spot on the screen. The fluorescent screen is made out of a phosphor, which is a material that emits light when bombarded with an electron beam.
Translation - Chinese 接收机的阴极射线管完成的功能与发射极的摄像管相反，它是把电信号转换成图象信号。图1给出了它的工作简图。这里暂时省略了反射和聚焦装置。代表图象的电信号被加到控制电极，控制电极的工作方式与电子管的控制栅极类似。信号使得控制电极的电动势围绕一个平均值变化。电动势的负值越大，电子束的强度就越小，相应的在屏幕上形成的光电的亮度越低。同样，电动势的负值变小是，屏上光点的亮度就越大。荧光屏是由磷构成，该材料受到电子束轰击时就会发光。
Years of translation experience: 15. Registered at ProZ.com: Nov 2007.
I had 3 years experience as a technical translator in a non-destructive test (NDT) company in beijing, then I became a field engineer/project manager as a result of a good command of NDT technology. I began to use AutoCAD for electric, mechnical, civil engineering drawings.