When using the PPK to measure the current of our custom hardware the lowest range doesn't give logical results. (Either the PPK python GUI or nRF connect) When the nRF52 on our custom hardware goes to sleep the current reads as 84mA constant. However while the unit is awake, LEDs are flashing or the unit is transmitting the current value is as expected. I see peaks of ~28mA when transmitting and a constant draw of 10mA when our LEDs are on as expected.
From my understanding of the PPK hardware, it will automatically switch between ranges by reading the voltage drop over different resistors. (R2 (510ohms), R3 (33 ohms) and R4 (1.8 ohms) on the PPK)
I measured their values with the unit switched off and both R3 and R4 read close to the values indicated in the schematic, however R2 read as 430 ohms whereas it is listed as 510 ohms in the schematic. The calibration value in the PPK software reads 503.26 ohms.
The reading of 84mA with a voltage of 3V suggests a load of ~36 ohms, which is possibly close to the value of R3?
What other values or readings should I test to find the cause of this fault?
