I tried several ways, but I couldn't find any logic in it.
I tried to play with the time base, with channels, active, inactive, connected, not connected, the zero line of the channel at the bottom, in the middle, at the top before pressing the auto button, after turning it off and on, by the end I was confused about where I was.
Sometimes the average value did not change, sometimes it did. By the same method.
I tried the same thing several times in a short period of time, sometimes I repeated it after a few seconds.
the average difference for me was 0.04V in 2V/div.
the deviation of the average value ranged from -0.03 to 0.15V.
If I change it to 5V/Div after autoset, CH1 increases by 0.1V and CH2 by 0.3V.
Vpp= was between 900mV-1V
When CH1Avg increases from 7.56 to 7.68, it keeps it stable.
When CH2Avg increases from 7.52 to 7.60 sometimes they fall back to 7.52.
If you measure a DC voltage of 7.5V, a DC shift is created. Is the signal located in the center of the screen? Is it the same on both channels or are there differences?
for two channels, blue is in the middle, yellow is two divisions above it, regardless of which channel the trigger is set to.
For one channel, it places the 7.5V voltage in the middle.
And after the DC-AC-DC maneuver, the base line of the channel stays the same, and the signal goes up.