Why do cameras use analog oscilloscopes to monitor waveforms?

An analog oscilloscope uses an analog circuit (oscilloscope tube, based on an electron gun). The electron gun emits electrons to the screen. The emitted electrons are focused to form an electron beam and hit the screen, the inner surface of the screen. Coated with fluorescent material so that the point where the electron beam hits emits light.

So, in fact, the "analog" of an analog oscilloscope is different from the so-called old "analog" in today's digital era. Professional radio and television equipment requires accurate numerical display of results, so most equipment is digital because of its accuracy.

Similarly, precisely for the lossless accuracy of the signal, the signal waveform display must use an analog oscilloscope, because it can directly display the original signal graphically.

If the waveform information is subjected to any digital conversion, this conversion process will cause signal loss and attenuation, and the final digital display will be inaccurate.

Uh-huh. . . Besides, the waveform itself is graphical, and what you see is the graphics, not the numerical values.

Why do we need to convert it into a digital signal and then display it graphically on the screen of a digital imaging device? Isn't this an extra step? Therefore, such meaningless and high-cost digital conversion equipment has no value at all.

This is why you don’t see digital devices like this.