i have a ADC200/20 PC-oscilloscope.
i use labview to trigger it, but there is always a significant offset of up to +-5% of the range on that signal, this offset is there during the whole taken block of data.
i tested it with your triggering example too, same thing.
however i recognized that when i use both channel there is no significant offset, but i dont want to do that, because i want the highest sampling rate i can get.
i didnt get this problem on picoscope.....i think it automatically activates both channels?