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Posts: 329
Registered: ‎02-20-2016
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[BGM111] Transmit power of advertisements vs connected

Hi,

 

I was analysing power consumption in energy profiler for our app when I noticed that advertisements seem to peak at a much higher amperage then connected transmissions will. 

I have set my app to use the full 8dBM of TX power.

 

https://snag.gy/FETuvc.jpg

 

Does this mean it's not possible to use the full 8dBM while connected or this related to protocol efficiency?

 

 

Posts: 2,960
Registered: ‎08-25-2015

Re: [BGM111] Transmit power of advertisements vs connected

Hi,

 

Analyzing with the energy profiler is probably not the best way to get accurate results. Have you tried to zoom in on an advertisement and a connection event to see what the TX peak actually is? Keep in mind that TX in connection intervals is much shorter than advertisements where a packet is sent (typically) on 3 channels and that can cause the profiler to render the peaks with increased height.

 

Regards,

Tiago

Posts: 329
Registered: ‎02-20-2016

Re: [BGM111] Transmit power of advertisements vs connected

He Tiago, 

 

I will zoom in and check it but your explanation makes sense. 

Thanks!

 

Posts: 329
Registered: ‎02-20-2016

Re: [BGM111] Transmit power of advertisements vs connected

He Tiago,

 

I tired your suggestion, zoomed all the way in and checked the duration of the spike but it seems to be of equal duration. Even zoomed in it's still tiny but I tried my best to select the peak.

Please check the following screenshots. TX power is set to 8dBM in both cases. 

 

Advertising power consumption;
https://snag.gy/2DmoPX.jpg

 

Connected power consumption;

https://snag.gy/mQeIKq.jpg

Posts: 2,960
Registered: ‎08-25-2015

Re: [BGM111] Transmit power of advertisements vs connected

Hi,

 

From what I see you zoomed out, not in. 

 

Regards,

Tiago

Posts: 329
Registered: ‎02-20-2016

Re: [BGM111] Transmit power of advertisements vs connected

I'm afraid not, this is far as it goes on Mac OS by pressing the plus icon here;

https://snag.gy/UF1pN9.jpg

Posts: 2,960
Registered: ‎08-25-2015

Re: [BGM111] Transmit power of advertisements vs connected

Hi,

 

What really? On windows you can zoom it a lot more. I suggest you create a thread in the studio board to report this.

 

Regards,

Tiago

Posts: 329
Registered: ‎02-20-2016

Re: [BGM111] Transmit power of advertisements vs connected

Ok, will do.

What about the duration of the peak tough? It seems to be exactly the same.

Posts: 2,960
Registered: ‎08-25-2015

Re: [BGM111] Transmit power of advertisements vs connected

Hi,

 

From that zoom level it does.

 

Regards,

Tiago

Posts: 329
Registered: ‎02-20-2016

Re: [BGM111] Transmit power of advertisements vs connected

[ Edited ]

Could you please try the same on Windows? 
I don't have access to a Windows machine at the moment.

 

PS: I've reported the zoom issue.

Posts: 2,960
Registered: ‎08-25-2015

Re: [BGM111] Transmit power of advertisements vs connected

[ Edited ]

Hi,

 

Well, the energy profiler is ok if you want to look at average values but it's not good for instantaneous figures because of sampling rate limitations.

 

Here are measurements done with a more powerful power analyzer. As you can see the peak for both connection and advertisement is the same.

 

Connection.png

 

 

Advertisement.png

 

Regards,

Tiago

 

 

Posts: 329
Registered: ‎02-20-2016

Re: [BGM111] Transmit power of advertisements vs connected

Thanks tmonte, that's good to know!