1. scope attenuation is 1x
2. DSO ia set to high Z impedance (1Mohm).
3. CH2 is HighZ on UTG962 (and there is no amplitude limit set).
Anyway, CH1 behave in normal way. If the amplitude is set to 5Vpp with an offset of 2.5V, on the scope I see a signal with 5Vpp amplitude and 2.5 offset.
On CH2 in other hand, I have to set the double value (10Vpp) in order to see 5V at the output. If I set 20Vpp on CH2 I see a 10Vpp signal on the scope... very consistent (is not limited by the output seen impedance). The major problem is: I cannot exceed 10Vpp output on CH2, on high impedance, because the amplitude setting is limited to 20Vpp.
thanks,
#ab