USB oscilloscope

USB oscilloscope

Oscilloscope uses a narrow electron beam composed of high-speed electrons to hit a screen coated with fluorescent material, producing small light spots. Under the action of the measured signal, the electron beam depicts the instantaneous value variation curve of the measured signal on the screen.

USB oscilloscope

effect
An instrument used to measure the shape of alternating current or pulse current waves, consisting of an electron tube amplifier, a scanning oscillator, a cathode ray tube, etc. In addition to observing the waveform of the current, frequency, voltage intensity, etc. can also be measured. Any periodic physical process that can be transformed into an electrical effect can be observed using an oscilloscope

Basic composition
display circuit
The display circuit consists of two parts: the oscilloscope and its control circuit. Oscilloscope is a special type of electronic tube and an important component of an oscilloscope. The oscilloscope tube consists of three parts: an electron gun, a deflection system, and a fluorescent screen.
electron gun
Electron guns are used to generate and form high-speed, focused electron streams to bombard fluorescent screens and make them glow. It is mainly composed of filament F, cathode K, control electrode G, anode A1, and second anode A2. Except for the filament, the structure of all other electrodes is a metal cylinder, and their axes are kept on the same axis. After being heated, the cathode can emit electrons along the axis; The control electrode has a negative potential relative to the cathode, and changing the potential can change the number of electrons passing through the small holes of the control electrode, that is, control the brightness of the light spot on the fluorescent screen. In order to improve the brightness of the light spot on the screen without reducing the sensitivity to electron beam deflection, a rear acceleration electrode A3 is added between the deflection system and the fluorescent screen in modern oscilloscopes.
The anode applies a positive voltage of several hundred volts to the cathode. A higher positive voltage is applied to the second anode than to the anode. The electron beam passing through the small hole of the control electrode is accelerated under the action of the anode and the second anode potential, and moves at high speed towards the direction of the fluorescent screen. Due to the repulsion of charges of the same polarity, the electron beam will gradually disperse. By the focusing effect of the electric field between the anode and the second anode, electrons are re aggregated and converge at a point. By appropriately controlling the potential difference between the anode and the second anode, the focus can be precisely placed on the fluorescent screen, resulting in a bright and small dot. Changing the potential difference between the anode and the second anode can adjust the focus of the light spot, which is the principle of adjusting the "focus" and "auxiliary focus" of the oscilloscope.

Mengyuan Technology is a high-tech company dedicated to serving all engineers. We create powerful tools for engineers to develop and create processes. Make these rare species, which were previously only seen in technology company laboratories, accessible tools for every engineer. We are willing to continuously optimize their user experience to improve the efficiency of engineers, while tirelessly searching for ways to reduce tool costs, so that every engineer and aspiring engineer can benefit.