The voltage range is automatically set based on the measured data. However, sometimes it helps to compare the magnitude of multiple channels. If they are shown with different ranges, they are difficult to compare.
TomGroe Jul 11, 2018
We had quite a few problems today with this. There was a 2v bias on a line but because of the auto scaling it looked like the signal was normal between 0 and 3v3 while it was actually between 2v and 3v3.