PPK ampere mode high peaks

[maya_sa]

Hello, 
I ran the nrfconnect (ver 3.7.1) in Power Profiler (ver 3.1.3) in BLE advertising.

When I run the source mode on 3000V I get normal peaks  (20mA), however when I run the Ampere mode with the same voltage I see peaks of 45-50 mA.

On a different PC (same PS and cable , same nrf version and power profiler version) both Ampere mode and Source mode show the same values (as they should).

Thank you for your help.

[JONATHAN LL]

Hi,

Is it a windows, Mac or Linux PC that you have tested ? what versions of the operating system?

What are you measuring on? custom HW or a DK?


It seams strange that by only changing PC the results differ, are you sure that you have followed the setup the same way both times?

Source meter mode:https://infocenter.nordicsemi.com/topic/ug_ppk2/UG/ppk/measure_current_source_meter.html 

Ampere meter mode: https://infocenter.nordicsemi.com/topic/ug_ppk2/UG/ppk/measure_current_ampere_meter.html 


Regards,
Jonathan

[maya_sa]

Hi , Windows 10 pro (on both pc), 64 bit 

And yes I have followed the setup in the same way both times

[JONATHAN LL]

Then it could be noise from the USB port, do you consistently get higher spikes on all USB port on the on PC with higher spikes?

Regards,
Jonathan

[maya_sa]

Yes

[JONATHAN LL]

Can you provide a plot and log from the test with "bad" PC?

Does the "bad" PC use AMD, if it is a AMD computer then could you try a USB 2.0 hub and see if the problem still occurs. 

Regards,
Jonathan