What is the sweep function on an oscilloscope?
When the oscilloscope is set to a long time base, the duration of the waveform being observed is correspondingly extended. For example, if the time base is set to 1 second and the horizontal axis spans 14 divisions, then one screen of the waveform represents 14 seconds. To view a 14-second waveform, you would theoretically have to wait 14 seconds. In roll‑mode, however, the waveform scrolls from right to left, refreshing continuously so that you can immediately see how the waveform evolves. This mode is typically used for observing waveforms with frequencies below 5 Hz.
