Apparent discrepancy between online power profiler & measurements

RE: Apparent discrepancy between online power profiler & measurements

run_ar — Tue, 26 Oct 2021 09:23:18 GMT

This settings means the Dcdc is disabled.

2. In the power profiler, we are using the average value for an actual measured event. I.e. measurements for the calculator was done using a dcdc power analyzer, then taking the average value for different states, packet lengths etc.

RE: Apparent discrepancy between online power profiler & measurements

jose123 — Thu, 21 Oct 2021 08:49:22 GMT

Hi run_ar, thanks for getting back to me!

The example is unmodified ble_app_hrs_pca10059_s140.

From checking sdk_config.h, there are some flags set to 0. Do you think this means DCDC is off?

#define NRFX_POWER_CONFIG_DEFAULT_DCDCEN 0

#define POWER_CONFIG_DEFAULT_DCDCEN 0

I will try with them on later when I have access to the high resolution ammeter.

Regarding (2), I see. But do you know why in the nordic blog current measurement plots, nRF52 Online Power Profiler, Stian Røed Hafskjold 26 Apr 2016. it doesn't look like capacitive smoothing?

RE: Apparent discrepancy between online power profiler & measurements

run_ar — Tue, 19 Oct 2021 07:33:41 GMT

Hi,

1. did you enable dcdc and did you make sure the TX output power is the same as what was configured in the power calculator? Based in the peaks in the actual measurements I would say something is different in the setup her.

2. Yes, this looks like the capacitors smoothing thing out, vs the calculator that uses the measured average for the each given event.