Failed to start the PPK

[Farit]

Hello, everyone.
I am newbie in use the Power Profiler Kit
I followed all the steps as described in PPK User Guide v2.2:

1 - cut traces on the DK (SB40)
2 - installed the PPK on top of the DK
3 - Connected USB cable to DK
4 - Set the all 3 switches for the DK
5 - Installed nRF Connect(v. 3.3.0)
6 - Installed PPK application in nrf Connect (v. 2.3.1)
7 - Started the PPK application
8 - I connect to COM22 - com_port of my DK
and after that there is an error "Failed to start the PPK"

The same problem is already discussed in this post.

May be also it is also necessary update .hex file ?
Any other suggestions ?

Best regards,
Farit F.

UPDATE:

A subsequent attempt to connect cause 

Error while setting up device. Error occured when open device long term. Errorcode: CouldNotCallFunction (0x9)
Lowlevel error: INVALID_OPERATION (fffffffe)

[Jared]

Hi,

Are you able to erase the application on the PPK by using nrfjprog:

nrfjprog -e

Are you using a USB hub? Have you tried changing the USB port or connecting it directly to the computer?

[Farit]

Jared, I have other question about nRF52840 DK current measure circuit:

What resistance should be between P22 contacts with cutted SB40 contacts? I measured approx. 13 kOhms. Is this normal value?

[Jared]

Hi, If you cut the solder bridge and measure the resistance then you will measure R90 as in the image, which is the resistance between VDD_nRF and VDD_nRF'.  The resistance isn't specified so I can't tell for sure if 13 kOhms is the correct value but It doesn't seem like an abnormal value.