I'd like to watch the output from a power supply to evaluate noise and distortion. The output is 15 VDC.

Unfortunately, when I zoom in to 50 mV per division, the signal is off the scale. I'm using vertical offset control to provide valuable visibility of the DC bias and noise simultaneously but the offset is insufficient.

The only solution is AC coupling, but then I lose information on how the DC bias changes under load. Have I missed something? Are these just the limits of this model? I am using an R&S HMO1002 oscilloscope.