What is the effect of aliasing on a digital oscilloscope when displaying a waveform?
A false, jittery low-frequency version of the waveform is displayed✓Bonne réponse
The waveform DC offset will be inaccurate
Calibration of the vertical scale is no longer valid
Excessive blanking occurs, which prevents display of the waveform
Explication
Signal components above half the sampling rate are folded down and reconstructed at the wrong frequency, so the screen shows a slow waveform that is not present in the signal, unsteady because its samples are not phase-coherent with it. Vertical calibration, DC offset and blanking are unaffected.