PPK II incorrect current measurements

[bogdanov]

While evaluating low power mode on SBC I notice something strange:

- PPK II measuring 76mA

- LAB power supply measuring 67mA of supply current

- Digital multi meter measuring 67mA

Note: All measurements are done at the same time, and verified separably ! Result are the same for PPK II "Source meter" and "Ampere meter"

I am relying on my PPK II for all kind of low power measurements, so it is really import for me to work correctly.

I made cross reference with lower load and it all match up - 12.5mA on PPK II , power supply and digital multi meter.

Is my PPK II broken or just part of it ?

[Kenneth]

Hello,

Unfortunately the measurement accuracy over 50mA is not as good as below 50mA, ref:
https://docs.nordicsemi.com/bundle/ug_ppk2/page/UG/ppk/ppk_measure_accuracy.html#ariaid-title1 

But it could also be interesting to understand if the 76mA is stable current, or if it's rapidly transitioning between <50mA and >50mA. If that is the case, you may try to check out if the answer here helps:
RE: PPK2 test peak current inaccuracy 

Kenneth