Systematic characterization of the system power consumption for various modes of operation (i.e., idle with BLE on/off, measurement with BLE off/connected) has been performed using the Keysight N6705 power analyzer. Fig. 8 shows an example of a measurement performed in standby mode. The short current pulses (peak values of up to 6mA) are used to periodically inject power into those domains of the processor, which are not switched off during standby mode (timers, sensor controller). This approach avoids static currents and minimizes power consumption.