Working principle
The electron gun emits electrons after being heated by the filament. The focusing electrode focuses the electrons emitted by the electron gun into a very thin electron beam, which can make the waveform display clear. The accelerating electrode has a larger The high positive voltage attracts electrons from the electron gun to move at high speed; a very high positive voltage is applied to the display screen, which attracts the electrons to hit the display screen, making the fluorescent material coated on the display screen glow. Vertical deflection plate and horizontal deflection plate A deflection voltage is added, and the polarity and amplitude of the deflection voltage control the position where the electron beam hits the display screen. When the deflection voltage changes with the input signal, the electron beam can "draw" the signal waveform on the screen. p>
The dual trace oscilloscope has two input terminals, which can be connected to two voltage signals for display at the same time. Inside the oscilloscope, after amplifying the input signal, use an electronic switch to switch the two input signals to the oscilloscope tube. On the deflection board, the two signals are displayed on the screen of the oscilloscope at the same time, which is convenient for the observation and comparison of the two signals.
Introduction
The oscilloscope tube of the dual trace oscilloscope is composed of an electron gun, a Y deflection plate, an X deflection plate, and a fluorescent screen. Using an electronic switch, the two voltage signals YCH1 and YCH2 to be measured are periodically applied to the Y deflection plate in turn. Due to the visual retention effect, two waveforms can be seen on the phosphor screen.
Use
After mastering the function of the dual-track oscilloscope and the knobs on the signal generator panel, you can operate in order to protect the phosphor screen from being burned. The brightness should not be too strong, and the light spot should not be allowed to stay on a position of the fluorescent screen for a long time. During the experiment, if the dual trace oscilloscope is not used for a short time, the "Brightness" knob can be adjusted to the minimum. The power supply of the trace oscilloscope will not shorten the service life of the oscilloscope.
All the switches and knobs on the dual trace oscilloscope have a certain strength and adjustment angle. They should be rotated gently and slowly during use. Do not use excessive force. Or rotate randomly.
The main part
The main part is composed of oscilloscope, amplifier, scanning and trigger system, and then replace it according to the component specifications listed in the component catalog.