Dual-trace oscilloscope usage and steps analysis (basic structure, working principle and advantages)

　　The dual-trace oscilloscope is a widely used electronic measuring instrument that can more accurately display the changes in electrical phenomena that are invisible to the naked eye. Technology is changing rapidly, and the latest applications of dual-trace oscilloscopes are emerging in an endless stream. Let's take a look at the working principle, structure, advantages, and usage methods and steps of the dual-trace oscilloscope.

　　1. Dual-trace oscilloscope definition

　　A dual-trace oscilloscope is a device that converts voltage signals into visible light signals and projects them onto a display screen. A dual-trace oscilloscope has two input terminals that can simultaneously connect two voltage signals for display. Inside the oscilloscope, after the input signals are amplified, an electronic switch is used to alternately switch the two input signals to the deflection plate of the oscilloscope tube, so that the two signals are simultaneously displayed on the screen of the oscilloscope tube, making it easier to observe and compare the two signals.

　　2. Basic structure of dual-trace oscilloscope

　　The dual-trace oscilloscope is mainly composed of four parts: oscilloscope tube, amplifier, scanning and triggering system, and power supply. The display device of the oscilloscope in the display system is a cathode ray tube, abbreviated as CRT. The basis of the cathode ray tube is a system that can generate electrons, called an electron gun. The electron gun emits electrons to the screen. The electrons emitted by the electron gun are focused to form an electron beam and hit a point in the center of the screen. The inner surface of the screen is coated with fluorescent material, so that the point hit by the electron beam emits light.

　　3. Working principle of dual-trace oscilloscope

　　The electron gun emits electrons after being heated by the filament. The focusing electrode focuses the electrons emitted by the electron gun into an extremely fine electron beam, which can make the waveform display clear. A higher positive voltage is applied to the accelerating electrode to attract electrons to escape from the electron gun and move at high speed; an extremely high positive voltage is applied to the display screen to attract electrons to collide with the display screen, making the fluorescent material coated on the display screen glow. Deflection voltage is applied to the vertical deflection plate and the horizontal deflection plate. 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.

　　The dual-trace oscilloscope has two input terminals, which can simultaneously connect two voltage signals for display. Inside the oscilloscope, after the input signal is amplified, an electronic switch is used to switch the two input signals to the deflection plate of the oscilloscope tube in turn, so that the two signals are displayed on the screen of the oscilloscope tube at the same time, which is convenient for observation and comparison of the two signals.