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Hello everyone, today we will learn about the types of oscilloscopes

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The oscilloscopes can be divided into analog oscilloscopes and digital oscilloscopes

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First let's look at an analog oscilloscope

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The earliest analog oscilloscopes appeared in the early 20th century,

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with only a few megabits of bandwidth at that time

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That is, the oscilloscope with CRT display that we saw in the early years,

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the principle is relatively simple

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When the digital oscilloscope was just launched, many engineers did not trust them,

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because they thought that the analog oscilloscope was a real-time oscilloscope,

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but the digital oscilloscope was not real-time

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Such is the case

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Because the digital oscilloscope needs to collect a piece of data into the cache first,

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and the subsequent processor will read the data in the cache for analysis and measurement,

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and then display

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The data processing time is much longer than the time for the oscilloscope to acquire the waveform

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In other words, most of the waveforms are missed,

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and we call this missing part the dead time

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In the case of sufficient bandwidth of the analog oscilloscope,

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it can display the change of voltage in real time

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Therefore, the advantages of analog oscilloscopes are good real-time performance,

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simple principle, and low price

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Its disadvantage is limited bandwidth, which is also its fatal flaw

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The second is that it cannot be stored and analyzed,

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it has no storage function, and many old engineers are very clear

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Save the waveform with an analog oscilloscope, you must take a camera to take pictures

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The trigger ability is too weak, which is the third shortcoming

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Unstable performance because it uses a lot of analog components

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After a long time, these components are not up to standard

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These are the disadvantages of analog oscilloscopes

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Let's look at the digital oscilloscope

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The development of digital oscilloscope is very fast

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Beginning in the 1980s, digital oscilloscopes came to prominence

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Especially with the development of high-speed digital and analog control chips and digital processing technology,

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the bandwidth, triggering, analysis and display of digital oscilloscopes

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have surpassed those of analog oscilloscopes

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So now the oscilloscopes on the market are basically all digital oscilloscopes

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It should be emphasized here that it still has a dead time,

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which depends on the processing and display speed of the digital oscilloscope

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Although real-time processing is still not possible at present,

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the faster the processing speed, the less lost waveforms

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There is a performance indicator in this regard, we call it the refresh rate of the waveforms

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Therefore, the advantages of digital oscilloscopes are the disadvantages of analog oscilloscopes

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The digital oscilloscope just makes up for the four shortcomings of the analog oscilloscope