When the signal goes through the scope\'s A/D converter it is sampled at a speci
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When the signal goes through the scope's A/D converter it is sampled at a specific frequency. This sampling frequency is determined by the timebase setting. So what is happening here? Why do we see this error? We went over this a few weeks ago and this was one of your terms to learn > I think that the sampling rate is to low and that is why we are sceing errors Why do you think this happens on these specific timebase settings? There is an excellent illustration in the textbook that explains what is happening Search the web to find a manual for the scope. There are some helpful pages in the section on "Scaling and Positioning Waveforms" about what is happening here. There is also a table that lists the sampling rate for different timebase setting What is the sampling rate when the tinebase is set to 250 mS/division? > The sampling rate when the time base is set to 250mS/Division would be 0.2565/s. What is the maximum frequency that can be properly analyzed on this setting? The maximum frequency that can be properly analyzed on this setting is 100MHz Do those values make sense? Explain why yes or no. > yes because the sampling rate is so low that's why we are sceing errors on the escilloscopeExplanation / Answer
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I will answer the second question since that is the one which is unanswered.
As you pass the signal through an oscilloscope, the A/D converter converts the continous time signal to discrete. The sampling frequency is a very important parameter in this conversion. According to the Nyquist criteria, the sampling frequency should be set to a minimum of 2 times the frequency of the signal. Usually it is set to 10 times. Else, there will occur something called aliasing. This results in the original signal not becoming recoverable after the conversion. This is the error that you see on the oscilloscope screen.
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