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ppk2 ampere meter measure error.not correct

hi nordic,

when ppk2 entry Ampere meter.
the measure current not correct.(it seem the scale and offset error ,but can be enable/disable output)

(test circuit only vdd(3.3 extern power)->resistor5.1k->ppk2(in)-->ppk2(out)-->gnd(ppk2 gnd)
it should be 0.6mA,but the ppk2 only 60uA.? and other case it get error value(nrf52840 dk blinkly example  same issue*1)

when ppk2 entry soure meter.it be work
it is right value.
(it test use nrf52840 dk ,blinkly example)
https://i.imgur.com/pMqRzEY.png

measure example(error):
https://i.imgur.com/o41SGHp.png

app version:
https://i.imgur.com/TlxZCIo.png

ppk2 F.W version:
15:37:32.160 Validating firmware for device with s/n D55B03750145
15:37:32.177 Opening device with s/n D55B03750145

os:
# nRFConnect System Report - 2020-12-30T10-21-15.621Z

- System:     xxxx
- BIOS:       xxxx
- CPU:        1 x IntelRegistered CoreTm i5-8265U 1.60 GHz 8 cores (4 physical)
- Memory:     1.2 GB free of 7.9 GB total
- Filesystem: C: (NTFS) 120 GB 94.9% used

- OS:         Microsoft Windows 10 Pro (10.0.19041) win32 ia32

- Versions
    - kernel: 10.0.19041
    - git: 2.21.0.windows.1
    - node: 12.13.0
    - python: 2.7.13
    - python3:

*1:

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_ppk2%2FUG%2Fppk%2Fmeasure_current_ampere_meter.html


2020-12-30T02:18:09.168Z INFO Deselecting device
2020-12-30T02:18:27.807Z INFO Validating firmware for device with s/n D55B03750145
2020-12-30T02:18:27.814Z INFO Opening device with s/n D55B03750145
2020-12-30T02:18:28.606Z INFO PPK started
2020-12-30T02:18:28.624Z INFO PPK opened
2020-12-30T02:18:36.925Z INFO DUT ON
2020-12-30T02:18:40.149Z INFO Sampling started
2020-12-30T02:18:51.021Z INFO Sampling stopped
2020-12-30T02:18:59.541Z INFO DUT OFF
2020-12-30T02:19:54.636Z INFO Deselecting device
2020-12-30T02:19:54.698Z INFO PPK closed
2020-12-30T02:19:58.355Z INFO Validating firmware for device with s/n D55B03750145
2020-12-30T02:19:58.362Z INFO Opening device with s/n D55B03750145
2020-12-30T02:19:58.729Z INFO PPK started
2020-12-30T02:19:58.748Z INFO PPK opened
2020-12-30T02:20:06.226Z INFO DUT ON
2020-12-30T02:20:07.538Z INFO Sampling started
2020-12-30T02:20:14.812Z INFO Sampling stopped
2020-12-30T02:20:15.640Z INFO DUT OFF

Parents
  • Due to Christmas holidays our technical support team is lower staffed, and the response time will be longer. Also, most of our R&D our out of office until January 4th. We apologize for any inconvenience this may cause.


    Hello, 
    The PPK team is currently out of office. Please expect an answer within next week. 

    Kind regards,
    Øyvind

  • Here is the result of connecting my nRF52840 DK running Blinky to source meter:

    While here is the result I get when connected in Ampere Meter

    Why do you have a 5k1 resistor connected as well? 

    "The PPK2 is driven by the nRF52840 System on Chip (SoC), which uses its analog-to-digital converter (ADC) to measure a voltage drop over a series of measurement resistors. Resistor values are used to calculate the power consumption. The PPK2 has five different measurement ranges, which are managed by an automatic switch circuitry."

    Kind regards,
    Øyvind

Reply
  • Here is the result of connecting my nRF52840 DK running Blinky to source meter:

    While here is the result I get when connected in Ampere Meter

    Why do you have a 5k1 resistor connected as well? 

    "The PPK2 is driven by the nRF52840 System on Chip (SoC), which uses its analog-to-digital converter (ADC) to measure a voltage drop over a series of measurement resistors. Resistor values are used to calculate the power consumption. The PPK2 has five different measurement ranges, which are managed by an automatic switch circuitry."

    Kind regards,
    Øyvind

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