PPK2 is not giving correct current measurements after the Update

[Surya]

Hi All,

PPK2 isn't accurately measuring currents below 20 μA, showing 0 nA instead. This started happening after you updated your nRF Connect software, and reverting to the old version didn't fix it.

OS: Windows 10

I have used NRF Connect (power profiler) to measure the current. 

My target board consumes a total of 7uA during sleep. Now it is showing as 0nA. 

Is there a solution for this?

I have measured the output voltage of PPK2 by adjusting the voltage in the Power Profiler app. I have observed the following

1. When powered off, VOut is -200 mV (negative)

2. When 3V is given as input to the Source meter, VOut is 2.6 V

3. When 5V is given as input to the Source meter, VOut is 4.4 V

[Menon]

Hello,

While reviewing some related code, we noticed a potential difference between the new and old PPK firmware, specifically around the voltage offset. Could you give the following firmware a try?
pca63100_ppk2_0.0.0_bebcab8.hex

You can program the HEX file using the Programmer app. The Power Profiler app will say the firmware isn’t compatible, but just click "No" when it asks to update. You can always switch back to the official release later by clicking "Yes" in that prompt.

It would be great if you could check two things:

• See if this improves the SMU voltage accuracy.

• Report the ldo_offset value by running the metadata read --all shell command.

  The PPK2 has a secondary COM port with shell access. You can use, for example, the Serial Terminal app to connect.
  

Kind Regards,

Abhijith