I'm working on a project, I need to collect data and then integrate it. This operation is sensitive to DC offset, or low-frequency noise. I'm using a 5000 series picoscope.
I'm observing a DC offset of a few milivolt, even without anything connected to the scope, which is normal. What's odd is this DC offset drifts over time. See the attached plo. The DC offset starts at about 7mV, and then decreases exponentially as the unit warms up, at a rate of about .001, that is V(t) = V0*exp(-r t), where V0 depends on when you start measuring, r=.001.
Has anyone else seen this happen?