nRF5340 DK v1.0.0

Using an ampere meter for current measurement

The average current drawn by the nRF5340 System on Chip (SoC) can be measured using an ampere meter. This method monitors the current in series with the nRF device.

Make sure you have prepared the Development Kit (DK) as described in section Preparing the DK.
Connect an ampere meter between the pins of connector P22 as shown in the following figure.
Figure 1. Current measurement with an ampere meter
Current measurement with an ampere meter on nRF5340 DK
Note: An ampere meter will measure the average current drawn by the nRF5340 SoC if:
  • The SoC is in a state where it draws a constant current, or, the activity on the device changing load current, like BLE connection events, is repeated continuously and has a short cycle time (less than 100 ms) so that the ampere meter will average whole load cycles and not parts of the cycle.
  • The dynamic range of the ampere meter is wide enough to give accurate measurements from 1 µA to 15 mA.

We recommend that you use a true RMS ampere meter.