An oscilloscope has become the "eye of an electronics engineer" and is an essential tool for designing, manufacturing, or servicing electronic devices. So what aspects do you choose to start with an oscilloscope?
First, the bandwidth
Bandwidth is the core parameter of the oscilloscope and a parameter of the file secondary.
Entry-level oscilloscopes typically have a bandwidth of 100Mhz, which accurately measures the amplitude of a sine wave signal within 20MHz. For digital signals, the oscilloscope must capture at least five harmonics to avoid picture distortion. It also requires the bandwidth of the entire measurement system to be five times the maximum analog bandwidth of the signal. This is what we often say is 5 times the rule. Choosing the right bandwidth only requires control over the highest frequency of the daily measurement signal.
Second, the number of channels
It is mainly a cost issue, because the increase in the number of channels will inevitably increase the cost. The oscilloscope that selects several channels depends on the specific situation. This question is just a brief description.
Third, the waveform refresh rate
Since the oscilloscope first stores the principle of post-processing, it is inevitable that the waveform observation has dead time. Therefore, the ability of an oscilloscope with different waveform refresh rates to capture low probability anomalous signals is quite different. Some engineers must have had such an experience - obviously, my circuit has a certain failure rate, and it can be completely normal when it is connected to the oscilloscope to see the waveform signal. This may be because your oscilloscope waveform refresh rate is a bit low, you need to use an oscilloscope with a higher waveform refresh rate to observe. Insert here, ZDS2024 oscilloscope waveform refresh rate up to 330k Oh, is the world 2000 series oscilloscope waveform refresh rate is the highest.
Fourth, the storage depth
I haven't talked about the sampling rate until now, but instead started to talk about the depth of storage. In fact, the sampling rate of a general-purpose oscilloscope is 5 times of the bandwidth. For example, the sampling rate of an oscilloscope with a bandwidth of 200 MHz is 1G (the higher sampling rate does not bring a big improvement), so this parameter is not given to the user too. More choices. On the contrary, such a high sampling rate is bound to require the storage depth parameter. The sampling rate of 1G requires a storage depth of 5M even if only the 5ms waveform is viewed, otherwise the sampling rate of the oscilloscope will decrease. So, yeah, not to mention the depth of storage, the sampling rate is all hooligans...
As long as these four points are fixed, the oscilloscope will not have much problem with waveform observation. After all, the basic functions of each oscilloscope are similar. Of course, for specific functions, there must be something deeper in the selection. For example, you need MDIO protocol decoding during the work process, or you need the oscilloscope to have digital filtering function, or some hard-to-catch signals during debugging. , can see, but it is not easy to set the trigger condition.
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