Power Profiler Measurement Results

[TigerD]

Hi,

I have nrf52840 DK and PCA63511 Power Profiler.

I have two questions:

1. The Average Current Consumption measured with profiler is 110uA (18 mA max, over 10 s window)

    But the average current measured  with a precision meter is 13 uA (18 mA max)

    Why there is so much difference?

2.Attached are two screen dumps from the same device with the same firmware measured over 100 seconds windows.

   The first picture seems right with average of 1.541mA.

   The second picture has about 7mA base added on to the result (lifted up). That causes the average to be 5.8mA. Is this caused by Profiler or because of a bug in the firmware ?

Thank you,

David Zhou

[Stian Røed Hafskjold]

Can you please describe your measurement setup. DK version. PPK version. All switch positions on both DK and PPK. PPK in stand alone mode, or PPK on top of DK. USB connected in which ports. External supply or DK supply. Voltage. External or DK JLink debugger. Etc.

If you can take a picture of the setup that would be great.

What is the application doing?

Start out by measuring on a system OFF example to get the lowest idle current (< 1 µA). Then you know if the problem lies with the measurement equipment/setup or the software:

int main(void){
    NRF_POWER->SYSTEMOFF = 1;
    for(;;){}
}