How do you measure real current consumption from this module? Im trying to measure mine but I can’t go as low as uA range in my oscilloscope. (Rigol DS1052E)
I mean, I use a 0R22 shunt resistor in series with the battery. So when I measure 4-5mV (LP mode off), this means 15-20 mA, which is expected
Then I switch LP=1 and then I see voltage get down to ~1mv. This means 4-5mA, which doesn’t make sense. But then I disconnect the power from the module and I still get readings on my oscilloscope around 0.8–1.2mv!! WHY? I don’t know. but I actually touch the probe tip with the ground test lead and I still get these values on screen. I tried an auto-recalibration in the TOOLS menu but nothing changed.
I could use a larger shunt like 5Ohm so the read voltage would be 25 times bigger, but the TX/RX spikes during UWB communication would lead to a large voltage drop in this resistor that the module wouldn’t probably stand it.
Any other way to achieve valid readings of uA currents??