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,

Could you please provide more details about your setup?
Is this a custom board, and how are you connecting the PPK2 to measure the current?

Kind regards,
Abhijith

[Surya]

Hi Abhijith,

I am connecting our custom board (NRF52xx with multiple sensors).  I will draw 7uA current during sleep. But now it is showing 0 nA. So I have checked the input voltage for the target(from the ppk2 kit), and it is not correct.

I am connecting the Vout of the ppk2 kit to the +ve of my target. and Gnd to -ve of my target.

[Menon]

Hello,

Surya said:

I am connecting the Vout of the ppk2 kit to the +ve of my target. and Gnd to -ve of my targe

Are you using the Ampere meter mode? What you’ve mentioned here is correct, but if it is Ampere meter mode, then connect the VIN of the PPK2 to the positive terminal of your external power supply, and ensure that all grounds (PPK2, target, and power supply) are connected together. Please refer to the documentation.

If I’m misunderstanding your setup, kindly provide a picture of it.
To rule out any system-related issues, you can also try it on a different PC and see if the issue persists.

Kind Regards,

Abhijith

[Surya]

Hi,

I have provided a simple description of my setup, as I tested it until the afternoon of that day. 
I have used Source meter mode (Not ammeter mode).

I have checked the Voltage across Vout and Gnd

[Menon]

Hello,

Sorry for the delayed response. I am checking internally to see if this issue might be related to the recent firmware update. I have received another report about a similar problem, so I suspect there may be something wrong with the recent firmware update. I will update you here once I have clarified a few things internally.

Kind regards,
Abhijith