I've been testing my 4227 Picoscope with a pulse generator, and noticed a dramatic difference in the quality of the traces obtained at the 2 V range compared with the 5 V range (and higher). When you switch from 2V to 5V, the noise level goes up by at least a factor of ten, and my signals get an additional DC offset of -60 mV. In addition, the DC offset fluctuates by ~10 mV over the span of a few seconds. If I didn't know any better, I'd say that there's a floating ground in the scope.
Is this normal? I realize that it's to be expected that you take a noise hit when you go to higher ranges, but this is almost unusable.