new (last month) 1054Z with all upgrades and SP4 firmware.
When viewing a PWM square wave -
single channel, AC coupled, triggered @ ~ 50%, Vert = 100mv/, waveform centered.
As the pulse width of the signal is changed, the position of the waveform on the screen changes.
50% - waveform is centered
60% - waveform moved down 50mv
70% - waveform moves down another 50mv
40% - waveform moves up 50mv
30% waveform moves up another 50mv
no settings changes on the scope, it is AC coupled, so why does it move?