NRF9160 current measurement

[mokoysh]

HI 

     Now I  am measuring current on the nRF9160DK  according to  https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/hardware-design/posts/getting-started-with-current-measurements-on-the-nrf9160.

    When measuring current on the UDP sample in NCS, the uart log

         *** Booting Zephyr OS build v2.6.0-rc1-ncs1 ***
         UDP sample has started
         LTE cell changed: Cell ID: -1, Tracking area: -1

   I use NB card ,and on application serial_lte_modem I can connect net. 

  On the UDP sanple i not found config to NB .what should I do?

 Can I measure current on the application serial_lte_modem? What do i do if i can?

 

   

[Øyvind]

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

[mokoysh]

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.

[Øyvind]

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

[Øyvind]

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

[mokoysh]

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? 

[Øyvind]

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