The video uses an oscilloscope to test 1MHz sine wave, 1MHz square wave, 100KHz sawtooth wave, and 100KHz triangle wave. Fix the storage depth of the oscilloscope, and then adjust the time base of the oscilloscope to change the sampling rate. Observe the display of the waveform at different sampling rates, and you can find that:
When the sampling rate is less than the signal frequency, the collected signal frequency is less than the actual frequency
When the sampling rate = signal frequency, the signal is completely distorted
Measuring square waves and sawtooth waves requires a sampling rate of 40-100 times the signal frequency.
Measuring sine waves and triangle waves requires a sampling rate that is 20 times the signal frequency.
If only the signal frequency is considered, then a sampling rate of 2 times is sufficient.
What sampling rate is required for an oscilloscope to measure signals without distortion?
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