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  • November 26, 2018 at 3:24 pm in reply to: Unit 8200007C high radiation #6289
    ON1GL
    Participant

    I have unit 8200007B and high radiation values at low temperatures.
    it first appeared last winter and now it is starting again 🙁
    (did not investigate it further, perhaps some component is malfuntioning at low temperature, unit is mounted outdoors)

    Luc

    January 9, 2018 at 3:04 pm in reply to: co2 sensor ? #5474
    ON1GL
    Participant

    Following the manual of the sensor “the autocalibration should be on for “indoor” units and off for others, with calibrations from time to time…”
    The way it works looking at the data is that if the ppm is to low the sensitivity is increased, if its high the sensitivity is decreased, this happens every 24 hours.
    With a outdoor sensor (like here in a city street) the variations are (very) big and causing a almost daily jump of the readings (70-120ppm in both directions).
    Switching the autocalibration off and automatic calibration every month at a quit moment ?
    Calibration always a tricky business….

    December 3, 2017 at 6:53 pm in reply to: unusual readings ? #5266
    ON1GL
    Participant

    Thanks for the reply, I was going in that direction of a hardware fault, will see if there is somewhere a capacitor in the junkbox… just in case …

    December 2, 2017 at 10:04 pm in reply to: unusual readings ? #5258
    ON1GL
    Participant

    can rule out server glitches, found this graph on my home system (in cpm), so is it real radiation or a hardware malfunction ?

    Attachments:

    1. radiation2.jpg

    August 31, 2017 at 9:52 pm in reply to: co2 sensor ? #4822
    ON1GL
    Participant

    The unit is now online for almost a month and still the co2 sensor jumps up or down every few days…
    It does not seems to settle after a few cycles.
    The sensor was at its bottom level (around 340-350 ppm) whole day (not very likely that this is correct) and jumped up this evening.

    Attachments:

    1. co2-c.jpg

    August 16, 2017 at 8:09 pm in reply to: co2 sensor ? #4777
    ON1GL
    Participant

    any news on this auto-calibrate problem ?
    This sensor is useless with every 24 hours auto-calibrate jumping up or down as much as 100 ppm a day 🙁

    August 2, 2017 at 9:04 pm in reply to: A3 remarks ? #4717
    ON1GL
    Participant

    The audio circuit of Unit 8200007B is modified and on line.
    As always the hardware mod was quickly done, but needed 10-times more time with the software (drivers) (I’m not so into bits and bytes….)
    Found somewhere a 62k resistor that was put across the existing 100k, for those who want to have a go see jpg
    Now monitoring for a few day to see the results.

    Thanks for the good work Radhoo

    Attachments:

    1. resistor-crop.jpg

    August 2, 2017 at 3:04 pm in reply to: A3 remarks ? #4713
    ON1GL
    Participant

    Nice solution Radoo !
    1) mic is already outside the box
    2) will change the resistor to around 40K (68K across the existing 100k, do not have the needed smd format)

    in the mean time the programming hardware also arrived, doing a software update is possible ….

    July 21, 2017 at 5:37 pm in reply to: A3 remarks ? #4671
    ON1GL
    Participant

    just checked all other A3’s with noise chips on the map and they are all the same 🙁

    July 21, 2017 at 8:03 am in reply to: A3 remarks ? #4666
    ON1GL
    Participant

    the only unit i see on the map with an acceptable noise graph is Unit 8200006E in NZ (except for the levels…)

    July 21, 2017 at 7:49 am in reply to: A3 remarks ? #4662
    ON1GL
    Participant

    managed to get the mic at the outside of the plastic box, but the results are disappointing 🙁
    Noise level without mic connected are around 47 dBA, much to high, is there something wrong with the amplifier circuit or is that software ?
    Included are a few pic of the modification.

    Attachments:

    1. Mic-internal-crop.jpg

    2. Mic1-crop.jpg

    3. Mic3-crop.jpg

    July 19, 2017 at 9:00 am in reply to: A3 remarks ? #4642
    ON1GL
    Participant

    Yes that one 😉
    The levels my unit is now recording is close to the fan noise level (35-40 dBA)
    Inside the metal housing and inside a plastic weatherproof housing will dampen the noise perhaps to much, will try to move the mic to a hole at the bottom of the outside plastic housing.

    July 19, 2017 at 8:44 am in reply to: A3 remarks ? #4638
    ON1GL
    Participant

    Noise sensor,
    I wonder if removing the mic from the pcb and placing it outside the metal housing(away from the build in fan) would improve the measurments ?
    How did you got that nice noise graph Radu ?

    July 16, 2017 at 9:30 pm in reply to: Frontend v5.0 #4626
    ON1GL
    Participant

    As ‘Trend’ indication a up/down arrow is enough for me, for the ‘Average’ I would like to see the value somewhere…
    Just my 2 cents

    Luc

    July 16, 2017 at 11:42 am in reply to: A3 remarks ? #4624
    ON1GL
    Participant

    with the “post-processing” it’s useless to try to store the date and make local graphs, so will stop my efforts trying to create graphs, correct gaphs are now out of my league, perhaps some software guru will come up with a solution in the future, ex on a raspberry-pi 🙂

    Also have to rethink the plastic housing, that is certainly also influencing some mesureaments.

    One (software) option that is missing is a possebility to silence the beep… the unit is outdoor at the streetside … (can always remove it from the pcb if needed).

    Keep up the good works !

    Luc

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