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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

  • I just tested the Power Profiler Kit II (PPK2) with fixed 1% wire-ended resistors and short leads. I repeated the value used in the question of 5.1k (5k1) and also 510k. I set the source voltage to 3.314 volts, and measured the voltage across the resistor with a 5-digit DVM as well as measuring the resistor value (out of circuit) with a 5-digit meter.

    I see 1.5% error on 5k1 and 0.3% error on 510k, assuming my quick calculation is accurate, which is good enough I think.

    PPK2 PPK-II
    Setting     Resistor Display DVM 5-digit          Actual   Error
    =========== ======== ======= ==================== ======== =====
    3.314 volts   5k1 1%  647uA  3.336 volts   5.116k 656.76uA  1.5%
    3.314 volts 510k  1% 6.47uA  3.338 volts 514.400k   6.49uA  0.3%

    This test was performed in Source Mode.

    Edit: I have tested the same board and resistors in Ampere Mode using a CR2032 coin cell with curious results:

    PPK2 PPK-II
    Setting     Resistor Display DVM 5-digit          Actual   Error
    =========== ======== ======= ==================== ======== =====
    3.160 volts   5k1 1%  680uA  3.160 volts   5.116k 617.67uA  9.2%
    3.231 volts 510k  1% 6.28uA  3.231 volts 514.400k   6.28uA  0.0%

    This test performed in Ampere Mode had no measurable error at 510k load but a massive 9.2% error at 5k1 load. Perhaps someone might repeat this test to verify my findings; I ran the test a few times.

Reply
  • I just tested the Power Profiler Kit II (PPK2) with fixed 1% wire-ended resistors and short leads. I repeated the value used in the question of 5.1k (5k1) and also 510k. I set the source voltage to 3.314 volts, and measured the voltage across the resistor with a 5-digit DVM as well as measuring the resistor value (out of circuit) with a 5-digit meter.

    I see 1.5% error on 5k1 and 0.3% error on 510k, assuming my quick calculation is accurate, which is good enough I think.

    PPK2 PPK-II
    Setting     Resistor Display DVM 5-digit          Actual   Error
    =========== ======== ======= ==================== ======== =====
    3.314 volts   5k1 1%  647uA  3.336 volts   5.116k 656.76uA  1.5%
    3.314 volts 510k  1% 6.47uA  3.338 volts 514.400k   6.49uA  0.3%

    This test was performed in Source Mode.

    Edit: I have tested the same board and resistors in Ampere Mode using a CR2032 coin cell with curious results:

    PPK2 PPK-II
    Setting     Resistor Display DVM 5-digit          Actual   Error
    =========== ======== ======= ==================== ======== =====
    3.160 volts   5k1 1%  680uA  3.160 volts   5.116k 617.67uA  9.2%
    3.231 volts 510k  1% 6.28uA  3.231 volts 514.400k   6.28uA  0.0%

    This test performed in Ampere Mode had no measurable error at 510k load but a massive 9.2% error at 5k1 load. Perhaps someone might repeat this test to verify my findings; I ran the test a few times.

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