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Types of oscilloscope

Oscilloscope is a graphic output device, which describes the waveform curve of the electrical signal source. This simple waveform can illustrate many characteristics of the signal source: the time and voltage value of the signal source, the frequency of the oscillating signal source, the frequency of the specific part of the "changing part" signal source in the circuit represented by the signal source relative to other parts, the existence of fault components to distort the signal source, and the direct current of the signal source. Component (DC) and AC components, the noise value of signal source and the change of noise with time, and the comparison of multiple waveform signal sources, etc.
The types of oscilloscopes include analog oscilloscope, digital oscilloscope, digital fluorescent oscilloscope, digital storage oscilloscope, PC-based digital oscilloscope, hand-held digital oscilloscope, etc.
Development of Oscilloscope
The initial stage was mainly analog oscilloscope.
In the 1940s, electronic oscilloscopes came into being. The development of radar and television requires waveform observation tools with good performance. Teck successfully developed synchronous oscilloscopes with bandwidth of 10MHz, which is the basis of modern oscilloscopes. Semiconductor and Computer in the 1950s
The bandwidth of the electronic oscilloscope has reached 100 MHz. In the 1960s, the United States, Japan, Britain and France made different contributions to the development of electronic oscilloscopes. Sampling oscilloscopes with bandwidth of 6 GHz, traveling oscilloscopes with bandwidth of 4 GHz, storage oscilloscopes with bandwidth of 1 GHz, portable and plug-in oscilloscopes became a series of products. In the 1970s, the analog electronic oscilloscope reached its peak. The line spectrum series was very complete. The multi-functional plug-in oscilloscope with a bandwidth of 1 GHz marked the high level of science and technology at that time. Logic oscilloscope and Digital Waveform Recorder were added to test digital circuits. Since then, analog oscilloscopes have not made greater progress, and began to give way to digital oscilloscopes. Britain and France have even withdrawn from the oscilloscope market. The technology of analog oscilloscopes is in the lead in the United States, and the middle and low-grade products are produced in Japan.
In order to improve the bandwidth of analog oscilloscope, it is necessary to advance the oscilloscope tube, vertical amplification and horizontal scanning in an all-round way. In order to improve the bandwidth of digital oscilloscope, only the performance of front-end A/D converter needs to be improved, and there is no special requirement for oscilloscope tube and scanning circuit. In addition, digital oscilloscope can make full use of memory, storage and disposal, as well as a variety of triggering and pre-triggering capabilities. In the 1980s, digital oscilloscopes emerged as a new force with numerous achievements, which has the potential to replace analog oscilloscopes in an all-round way. The analog oscilloscopes gradually retreated from the front to the back.
The output waveform of cathode ray tube used in analog oscilloscope is the same as that of analog oscilloscope. That is to say, the speed of electron movement in oscilloscope tube is proportional to the frequency of signal source. The higher the frequency of signal source is, the faster the speed of electron is. The brightness of oscilloscope screen is inversely proportional to the speed of electron beam. The brightness of low frequency waveform is higher, and the high frequency wave is higher. The brightness of the shape is low. The third dimension information of the signal source can be easily obtained by using the brightness or gray level of the fluorescent screen. If the vertical axis of the screen is used to represent the amplitude and the horizontal axis is used to represent the time, the brightness of the screen can represent the change of the amplitude of the signal source with time. This time-dependent fluorescence afterglow (gray scale calibration) effect is very effective for observing mixed and occasional waveforms. Digital storage oscilloscope is the representative product of this special oscilloscope. Its highest performance reaches 800MHz bandwidth and can record fast transient incidents of about 1ns.
Digital oscilloscope lacks afterglow output function, because it is a digital disposal, only two states, non-high or low, in principle, the waveform is also "yes" and "no" output. In order to achieve the multi-level brightness change like analog oscilloscope, special image processing chip must be used. It is not only a data acquisition chip, but also a raster scanner. It simulates the luminous characteristics of the oscilloscope screen fluorescent body. The waveform is stored on the LCD monochrome or color output screen of 500 *200 pixels with 16-level brightness grading, and every one of them is on the LCD monochrome or color Update the Tektronix digital oscilloscope once every 30 seconds. Because the analog storage oscilloscope can only record waveforms by photographic negatives, it is inconvenient to save data, while the digital fluorescence oscilloscope is the output of digital disposal, so it is very convenient to record, dispose and save data. For example, red is used to indicate the waveform with the highest probability, blue is used to indicate the waveform with the lowest probability. Since the digital oscilloscope has reached the bandwidth level of more than 4 GHz, the overall performance of the digital oscilloscope is better than that of the analog storage oscilloscope with the fluorescence output characteristics.
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