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  • February 23, 2015 at 9:30 am #1422
    Lars
    Participant

    Hi

    I recently upgraded the firmware, and the unit has been online for a while now:

    uRADMonitor 11000016
    type:1 hw:108 sw:110 SBM-20radiation:21CPM
    average:28.06CPM
    temperature:28.38C

    voltage:385V (48%)
    uptime:261701s
    wdt:204s

    ip:10.47.243.228
    server:23.239.13.18
    http:0JSON

    My URL:

    Home


    The value is around: 0.18uSv/h

    But the value seems high. Compare with the official readings of Oslo:
    http://radnett.nrpa.no/?id=215049
    Which is always around 0,10 µSv/h

    The unit is currently in 5th floor of a brick office building. I don’t know of any nuclear devices in the vicinity. =)

    February 23, 2015 at 8:26 pm #1426
    uRADMonitor
    Keymaster

    Lars, I see the increase dates back to Feb 20:

    https://www.uradmonitor.com/data/0.1/public.php?id=11000016&param=cpm&start=25&size=xxlarge&integration=3

    What changed at that point?

    February 23, 2015 at 9:05 pm #1427
    Lars
    Participant

    On Fri, Feb 20, 2015 at 10:54 AM, Lars Falk-Petersen <> wrote:
    Hi

    Update with new programmer (same one as in blog) went without a hitch. My node is up and reporting again.

    February 24, 2015 at 1:57 pm #1431
    uRADMonitor
    Keymaster

    Hi Lars,

    What’s strange about it is that also the duty cycle has increased:
    https://www.uradmonitor.com/data/0.1/public.php?id=11000016&param=duty&start=25&size=xxlarge&integration=3

    Did you change the power supply or the power supply cable?

    EDIT: I found the answer, it was the temperature that caused the duty cycle increase: the higher temperature levels affected the permeability of the ferrite core in the high voltage inverter, resulting in the higher duty cycle:
    https://www.uradmonitor.com/data/0.1/public.php?id=11000016&param=temp&start=25&size=xxlarge&integration=3

    Still, I don’t know what’s causing the increase in readings, but I will think more about it.

    • This reply was modified 9 years, 2 months ago by uRADMonitor.
    February 24, 2015 at 2:52 pm #1433
    Lars
    Participant

    Ok. Trying another PSU now, just to check.

    March 4, 2015 at 8:40 am #1485
    Lars
    Participant

    From yesterday evening it has been back in my apartment, running on yet another PSU. Slightly lower reading, but still way above the official readings for Oslo.

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