Current consumption Nrf9160 and a noise problem when measuring current(?)

RE: Current consumption Nrf9160 and a noise problem when measuring current(?)

Kenneth — Mon, 23 Jan 2023 12:49:36 GMT

[quote user="Gal_S"]How to calculate the current consumption by combining different protocols?[/quote]

You would need to measure the charge for 1 transaction, and then if you know the time between transactions you could calculate the average as simply charge/time = current (e.g. if the enrgy is measured as 1uC, and you need to read every 100ms: 1uC / 0.1 sec = 10uA).

Kenneth

RE: Current consumption Nrf9160 and a noise problem when measuring current(?)

Gal_S — Mon, 23 Jan 2023 12:14:48 GMT

Hi,

Thanks for the answer.
How to calculate the current consumption by combining different protocols?

Regarding the power supply, we are using a PCB and not an EVB, the PCB gets voltage from the power supply.

RE: Current consumption Nrf9160 and a noise problem when measuring current(?)

Kenneth — Mon, 23 Jan 2023 12:00:10 GMT

Hello,

My suggestion is to first start with a simple example (for instance without logging), and then measure on it for comparison before adding more of the functionality to observe the difference. In terms of how to measure etc, please check out:
https://devzone.nordicsemi.com/guides/cellular-iot-guides/b/hardware-design/posts/getting-started-with-current-measurements-on-the-nrf9160

If you are measuring on an nRF91 DK you should also check out:
https://infocenter.nordicsemi.com/topic/ug_nrf91_dk/UG/nrf91_DK/hw_measure_current.html

Also check out the description for the PPK2 on how to measure current:
https://infocenter.nordicsemi.com/topic/ug_ppk2/UG/ppk/setting_up.html

For instance it does say: "Note: Although using USB to power the DUT is sufficient, Nordic recommends a lab power supply to ensure better accuracy."

Best regards,
Kenneth