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  • February 16, 2015 at 7:39 pm #1361
    movax
    Participant

    Just returned from 4 week trip, and unpacked my unit. Looks really nice and small!

    Connected to switch and some desktop computer (manual claims 500mA which is standard USB, should be enough). Unit is inside building for testing, about 1.5 meter above floor, and about 12 meters above ground level. Close to windows open.

    Connected. It booted, showed up in my router, and on uRADMonitor web page with correct geolocation.

    uRADMonitor 11000063
    type:1 hw:108 sw:107 SBM-20
    radiation:0CPM
    average:0.00CPM
    temperature:24.44C

    voltage:375V
    duty:35%
    uptime:1565s

    ip:10.0.0.206
    server:23.239.13.18
    http:200

    🙁

    Is there easy way to see if tubs is not broken?

    • This topic was modified 11 years, 3 months ago by movax.
    • This topic was modified 11 years, 3 months ago by movax.
    February 16, 2015 at 8:56 pm #1364
    movax
    Participant

    I opened the unit, and see no visible damage to the tube. Even without the case (yep, I know 400V!), it reads 0.00 cpm.

    Could it be some bad solder joint?

    Or I am missing something?

    February 16, 2015 at 9:45 pm #1365
    uRADMonitor
    Keymaster

    This can only indicate tube damage during transit, but it is somewhat unlikely, as it never happened until now. Unit data during pre-shipment tests is attached.

    Attachments:

    1. public.php_.png

    March 6, 2015 at 3:04 pm #1496
    movax
    Participant

    Thank you radhoo@ for all your help.

    I eventually found the fault in the tube. It was a small wire connecting electrode to the metal body on one ends of the tube. It must have been broken duren transport by vibrations. Wire looks flimsy and a bit old, doesn’t even look like copper but rather like aluminium or zinc.

    Anyway, radhoo wrote up nice tutorial how to troubleshoot issues with the tube using multimeter and osciloscope, and we found out that indeed tube is dead.

    After replacing tube for new tested one (it is a little hard to solder it properly, but possible with lots of flux and solder and good solder iron), everything works perfectly.

    It is also reading correctly (confirmed on second unit)!

    Still the glass tube in the “broken” tube itself is intact, and metal casing too, so it should be easy to reuse it or fix with a piece of wire.

    It might have helped a little to prevent this damage, if the tube was strapped to the pcb in the middle of its length. There are even holes to do that on PCB 🙂

    Case closed.

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