What is the difference between analog oscilloscopes and digital oscilloscopes?
Do you know the difference between analog oscilloscopes and digital oscilloscopes? In the final analysis, oscilloscopes and digital oscilloscopes are nothing more than instruments used for measurement. What is the difference between analog oscilloscopes and digital oscilloscopes? Maybe someone can tell you something, let's learn more about it below! An oscilloscope is a window for observing waveforms. It allows designers or maintenance personnel to see electronic waveforms in detail, achieving the effect of seeing is believing. Because the human eye is the most sensitive visual organ, it can detect the smallest details and reflect objects to the brain very quickly for comparison and judgment.
According to different classifications of signals, oscilloscopes can be divided into analog oscilloscopes and digital oscilloscopes.
Analog oscilloscopes use analog circuits (oscilloscope tubes, the basis of which is an electron gun). The electron gun emits electrons toward the screen. The emitted electrons are focused to form an electron beam and hit the screen. The inner surface of the screen is coated with a phosphor so that the point where the electron beam hits emits light.
Digital oscilloscopes are high-performance oscilloscopes manufactured by a series of technologies such as data acquisition, A/D conversion, and software programming. It works by converting the measured voltage into digital information through an analog converter (ADC). It captures a series of sample values of the waveform and stores the sample values. The storage limit is to determine whether the accumulated sample values can be depicted. until the waveform is output, and then the digital oscilloscope reconstructs the waveform.
The differences between analog oscilloscopes and digital oscilloscopes:
Different bandwidths: Affected by the electronic offset speed, the bandwidth of analog oscilloscopes can only reach a few hundred megahertz, while the bandwidth of digital oscilloscopes currently exceeds 100GHz;
Functional differences: In addition to being able to stably observe some continuous periodic signals, digital oscilloscopes have digitized waveforms and can realize various functions such as automatic waveform measurement, waveform storage, waveform analysis, multiple waveform triggering and remote control;
Difference in stability: Since analog oscilloscopes are all analog devices, the impact of discrete indicators and temperature drift is more serious;
Others, such as analog oscilloscopes are relatively larger in size; analog oscilloscopes can capture waveforms in real time, while digital oscilloscopes will cause part of the waveforms to be lost due to processing. However, with the improvement of ADC speed and processing algorithms, the waveform capture rate of digital oscilloscopes can already meet the requirements. Usage requirements.
They work in different ways: analog oscilloscopes work by directly measuring the signal voltage and depicting the voltage in the vertical direction by an electron beam passing through the oscilloscope screen from left to right; digital oscilloscopes work by converting the measured signal through an analog converter (ADC). The voltage is converted into digital information, and a series of samples of the waveform are captured and stored. The storage limit is to determine whether the accumulated samples can depict the waveform. Then, the digital oscilloscope reconstructs the waveform.
The principle is different: Analog oscilloscopes use analog circuits. The electron gun emits electrons to the screen. The emitted electrons are focused to form an electron beam and hit the screen. The inner surface of the screen is coated with fluorescent material, so that the point where the electron beam hits will Emit light; digital oscilloscopes generally support multi-level menus, which can provide users with multiple choices and multiple analysis functions. Some oscilloscopes can provide storage to save and process waveforms.
Differences in size and weight: Analog oscilloscopes are larger than digital oscilloscopes, appear bulkier, and are inconvenient to carry, while digital oscilloscopes are light in weight and very convenient to carry.
The display is different: the waveform displayed by the analog oscilloscope is continuous, the real waveform of the signal, and the response speed is extremely fast; the waveform displayed by the digital oscilloscope is composed of points sampled by the digital circuit, and is a discontinuous waveform. The higher the sampling rate, The higher the oscilloscope is, the closer it is to the real waveform, but the display speed is not as fast as the simulator.
Difference in response speed: This is one of the biggest advantages of analog oscilloscopes, which is difficult to replace with digital oscilloscopes. For example, when testing a certain signal, analog oscilloscopes can display waveforms instantly with almost no delay, while digital oscilloscopes still need After the test signal is processed by a digital circuit, the analog waveform is displayed, which lags behind the analog oscilloscope in display time. The above is the difference between analog oscilloscopes and digital oscilloscopes. I hope it can help you.
