Current measurement for a Nordic Thingy 91 device

[Adeel]

Hi Dev Zone Team,

I had a question regarding the current measurement of Nordic Thingy 91. I am following the steps provided in the Thingy91 documentation. 

I have a Joulescope (https://www.joulescope.com/) for the current measurement and viewing. 

I have cut the SB3 Jumper and wish to connect the Vdd and GND pins. I have also deattached the battery.

I wanted to know the voltage to be applied at the VDD_nRF91 pin and if possible a connection picture.

I have attached the schematic that I was following for reference and also my module that I wish to measure.

. 

Thanks :).

[helsing]

Hi Adeel,

Sorry for the late reply. I have found the way to do this and will get back to you shortly.

Best Regards,

Håkon

[Adeel]

Hi Håkon,

Thanks for the reply. I managed to work around with it and got the connections done.

I needed to do this in order to check the idle power consumption when AT+CFUN=0 i.e: when modem is off.

I noticed that the current at the modem-off mode is 1.2 mA which is quite more than I anticipated.

Can you give me some tips on how could I try and reduce this current consumption at the modem off mode.  

Thanks :)

[helsing]

Hi Adeel,

Which application are you running? When it comes to current consumption it is probably also worth mentioning the Online Power Profiler for nRF91.

Here is a blog post on how to achieve and measure the lowest current consumption with PSM mode.

I will get back to you over the weekend.

Best Regards,

Håkon

[Adeel]

Hi Hakon,

I was running the asset tracker application. I noticed that modem off mode current is quite higher when (about 1.2 mA) for the Nordic thingy91 device. I can share you the screenshot on monday so that you can have a look. I will also try your method as suggested in the Online Power Profiler as i have a nRF9160DK with me.

Regards,

Adeel.