PPK little negative offset which is breaking AVG value

[ThierryC]

I use PPK wit ha stardard setup with all switches set to DK. Everything works fine, excepted that I have a little offset and the IDLE state is negative... which make the AVG value to be wrong (negative). See following pictures.

This is more visible if I put the nRF52 in sleep mode (supposed to consume around 1 uA AVG), and we can see the negative offset of about 10 uA there.

Is there a way to Calibrate or correct this offset ? The resistor calibration could only change the scale, but how do we get to mesure negative currents there ?

I didn't find anything usefull on the PPK manual for that. Any idea ? Thanks

[ThierryC]

Was a real leak of current on my setup : the GND of the serial link was causing this little current leak, measured correctly by the PPK.

[wlgrd]

Oh, good catch =D