NRF9160 current measurement

RE: NRF9160 current measurement

Øyvind — Fri, 01 Oct 2021 12:34:47 GMT

I see that my response from yesterday did not go through.

I've asked our expert on his opinion regarding the numbers that you provide. The response is that the spike frequency fits the refresh mode in PSM, which does look correct. However, the numbers are somewhat high. What equipment are you using to measure? Can you please check the results with multimeter connected to the current measurement header?

What version of the nRF9160DK are you using?

Thank you.

Kind regards,
Øyvind

RE: NRF9160 current measurement

mokoysh — Wed, 29 Sep 2021 11:26:50 GMT

Now,config to NB net, enter PSM mode.

The current is 12uA

Amplify the signal. Between two signal bumps,the current is 2uA

A period ,the current is 13uA

Is this result correct? The PSM current is 2uA?What causes the periodic increase in current? Is SYSTEM wake up?

RE: NRF9160 current measurement

Øyvind — Wed, 29 Sep 2021 09:19:28 GMT

Also, please make sure that you have configured CONFIG_LTE_NETWORK_MODE_LTE_M=n and CONFIG_LTE_NETWORK_MODE_NBIOT=y in prj.conf.

-Øyvind

RE: NRF9160 current measurement

Øyvind — Wed, 29 Sep 2021 09:14:04 GMT

Hi! There should not be an issue using UDP sample on NB-IoT network. How long are you running the UDP sample when receiving LTE cell changed: Cell ID: -1, Tracking area: -1 and how long are you running the Seral LTE Modem ? Can you provide full log from both samples running e.g. 30 minutes?

Thanks!

Kind regards,
Øyvind

RE: NRF9160 current measurement

mokoysh — Tue, 28 Sep 2021 09:33:17 GMT

Thanks respond

I am try to connect NBIOT network,and use China Mobile SIM.I don't have another SIM. Current NCS version is V1.6.0 ,modem version is mfw_nrf9160_1.3.0.

When I connect NB net by serial_lte_modem application,no new connect log printf in JLINK.

AT LOG,

JLINK LOG

I don't test in Asset Tracker.

I want to measure PSM and EDRX current ,so I measure according to https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/hardware-design/posts/getting-started-with-current-measurements-on-the-nrf9160.

RE: NRF9160 current measurement

Øyvind — Mon, 27 Sep 2021 12:40:15 GMT

Hello,

What network are you trying to connect? Are you using the iBasis SIM or have you tested with another? Please provide information on what NCS version and modem FW version you are using, and can you please provide full logs from running the Serial LTE Modem executing "AT+CFUN?"

Have you tested with e.g. Asset Tracker?

Thank you!

Kind regards,

Øyvind