I just dragged out my Joulescope to test out some new hardware for comparison to old. I’m seeing one anomaly that has me puzzled. When my device is in sleep mode, it is very very low current. And, in most ranges, it is reading nominally 0mA/0uA or close to it. So far so good. However, when I switch off auto-range; set to fixed 180mA range to test general (non-sleep) mode I see strange things. When not sleeping, I expect to see 40-100mA nominal currents (plus switching regulator spikes), This does seem normal and gives me reasonable values. However, when going back to sleep, the Joulescope is claiming I have around 11 mA and 37mW when it should be in the nW range.
Is it broken? Or what setting is wrong?