PPK ampere mode high peaks

RE: PPK ampere mode high peaks

JONATHAN LL — Thu, 04 Nov 2021 16:19:41 GMT

Looks like the issue is with the USB supply from your computer then, do you have a lot of other devices plugged in to the computer at the same time?
It might be noise from ground or from a different device connected to the computer, cant really say what exactly is the issue.

But by using a different power source and suppling through USB power only you are able to get the correct measurements on the "bad" computer. So you have at least a work around at the moment.

Will do some more pondering on this case and update wit any news, or if you have any more questions feel free to ask.

Regards,
Jonathan

RE: PPK ampere mode high peaks

maya_sa — Thu, 04 Nov 2021 08:01:06 GMT

The USB hub was powered from the USB on the pc.

I have used an external USB charger and connected to the "USB power only" connector.

the results are as expected (the good ones)

RE: PPK ampere mode high peaks

JONATHAN LL — Tue, 02 Nov 2021 18:20:06 GMT

Hi, thanks for the information so far, i dont have a solution for you, but i do have some more options for you to try and a questions. This is a very unique issue you have come across and it is very interesting for us to debug.

Was the USB hub you used powered externally also, or just from USB on computer?

Could you use a USB charger and connect a cable to the "USB power Only" connector. Want to check if the computer you are using has some supply irregularities from the USB ports.

Regards,
Jonathan

RE: PPK ampere mode high peaks

maya_sa — Thu, 28 Oct 2021 08:59:54 GMT

I have tested with a usb 2.0 hub and no change in the values
both pc's are intel computers

RE: PPK ampere mode high peaks

JONATHAN LL — Thu, 28 Oct 2021 08:57:30 GMT

Thanks,

Seems to be a strange artifact, could you provide some more info on the two computers.

Are both intel computers?

And can you test with a USB 2.0 hub ?

Regards,
Jonathan

RE: PPK ampere mode high peaks

maya_sa — Wed, 27 Oct 2021 13:34:21 GMT

devzone.nordicsemi.com/.../ppkexports.zip the ppk and csv are in this zip , didnt let me upload separately

RE: PPK ampere mode high peaks

JONATHAN LL — Wed, 27 Oct 2021 13:28:12 GMT

Need to ask you for one more thing, could you click on the save/export and save as PPK and csv and share both.

Regards,
Jonathan

RE: PPK ampere mode high peaks

maya_sa — Wed, 27 Oct 2021 11:38:52 GMT

The log:

2021-10-27T11:34:07.732Z INFO Application data folder: C:\Users\maya.sagalin\AppData\Roaming\nrfconnect\pc-nrfconnect-ppk
2021-10-27T11:34:07.814Z DEBUG App pc-nrfconnect-ppk v3.1.3 official
2021-10-27T11:34:07.814Z DEBUG App path: C:\Users\maya.sagalin\.nrfconnect-apps\node_modules\pc-nrfconnect-ppk
2021-10-27T11:34:07.814Z DEBUG nRFConnect 3.7.1 is not supported by the app (^3.6.1)
2021-10-27T11:34:07.814Z DEBUG nRFConnect path: C:\Users\maya.sagalin\AppData\Local\Programs\nrfconnect\resources\app.asar
2021-10-27T11:34:07.815Z DEBUG HomeDir: C:\Users\maya.sagalin
2021-10-27T11:34:07.815Z DEBUG TmpDir: C:\Users\MAYA~1.SAG\AppData\Local\Temp
2021-10-27T11:35:37.354Z INFO Validating firmware for device with s/n 000601008155
2021-10-27T11:35:37.662Z ERROR Error while setting up device 000601008155: Error occured when close opened device. Errorcode: CouldNotOpenDevice (0x4)
Lowlevel error: LOW_VOLTAGE (fffffff4)

2021-10-27T11:35:37.662Z INFO Deselecting device
2021-10-27T11:35:39.662Z INFO Validating firmware for device with s/n 000601008155
2021-10-27T11:35:39.935Z ERROR Error while setting up device 000601008155: Error occured when close opened device. Errorcode: CouldNotOpenDevice (0x4)
Lowlevel error: LOW_VOLTAGE (fffffff4)

2021-10-27T11:35:39.935Z INFO Deselecting device
2021-10-27T11:35:46.384Z INFO Validating firmware for device with s/n E45F82AF9DC5
2021-10-27T11:35:46.393Z INFO Opening device with s/n E45F82AF9DC5
2021-10-27T11:35:46.638Z INFO Trigger length updated to 10 ms
2021-10-27T11:35:46.674Z INFO PPK started
2021-10-27T11:35:46.707Z INFO PPK opened
2021-10-27T11:35:48.669Z INFO Mode: Ampere meter
2021-10-27T11:35:48.682Z INFO DUT ON
2021-10-27T11:35:49.729Z INFO Sampling started
2021-10-27T11:36:10.911Z INFO Sampling stopped

RE: PPK ampere mode high peaks

JONATHAN LL — Wed, 27 Oct 2021 11:21:30 GMT

Could you provide the log also:

you can access it by clicking on the open log file button

Regards,
Jonathan

RE: PPK ampere mode high peaks

maya_sa — Wed, 27 Oct 2021 10:25:58 GMT

the bad PC dosnt use AMD

Thank you

RE: PPK ampere mode high peaks

JONATHAN LL — Wed, 27 Oct 2021 07:19:45 GMT

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

RE: PPK ampere mode high peaks

maya_sa — Tue, 26 Oct 2021 07:15:17 GMT

Yes

RE: PPK ampere mode high peaks

JONATHAN LL — Mon, 25 Oct 2021 11:53:58 GMT

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

RE: PPK ampere mode high peaks

maya_sa — Mon, 25 Oct 2021 11:42:56 GMT

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

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

RE: PPK ampere mode high peaks

JONATHAN LL — Mon, 25 Oct 2021 11:39:29 GMT

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