(1) Oscilloscope consists of oscilloscope (cathode ray CRT), vertical amplifier (Y amplifier), horizontal amplifier (X amplifier), scan generator, trigger synchronization and power supply.

Oscilloscope: Emit electrons, accelerate and deflect them.

X, y amplification: change the intensity of signal output.

Synchronization and scanning: obtaining sawtooth voltage signals.

Power supply: provides the electric energy needed for the work of all parts of the oscilloscope.

(2) Twist the horizontal axis or vertical axis of the scanning line back and forth to adjust it to the appropriate position of the oscilloscope tube.

(3) The amplitude is too large, beyond the screen range! There may even be no scan lines.

(4) less than. Because the scanning frequency is low.