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Verifying depth calibration?

Discussion in 'Computers, Gauges, Watches and Analyzers' started by CuriousRambler, Mar 29, 2020.

  1. CuriousRambler

    CuriousRambler Solo Diver

    # of Dives: 25 - 49
    Location: California
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    Not recently, but I have in the past. After I noticed differences in our max depth post-dive, I compared with a couple others during the dive and was deeper. Can't recall by how much, but I did log the comparison and said my computer was deeper on two occasions with different buddies. One of those comparisons was a buddy with an analog console and a wrist computer, which agreed with each other, leaving me the odd man out.
     
  2. D_Fresh

    D_Fresh Manta Ray

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    Could this be the result of the barometric pressure changing (i.e., weather coming in) and the computer "seeing" that as a change in altitude?
     
    michael-fisch likes this.
  3. michael-fisch

    michael-fisch ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 2,500 - 4,999
    Location: Germany n soon Lake City FL
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    350 to 450 millibars or 5-8 psi? No!
    Not even the eye of a major hurricane has that much change.

    Michael
     
    Dark Wolf likes this.
  4. CuriousRambler

    CuriousRambler Solo Diver

    # of Dives: 25 - 49
    Location: California
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    I suspect he was referring to the varying elevation setting I see on the surface, in which case my best guess is also just some auto setting varying with weather patterns, which would be more like 0.2-0.3psi, or 0.6inHg which is well within the range of most weather barometers.

    Definitely, the depth issue isn't that far off because of some clouds haha
     
  5. D_Fresh

    D_Fresh Manta Ray

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    Yes, that's exactly what I was referring to. I should have expanded upon it in my previous post. But back in Arizona, during summer monsoons, I have definitely seen my GPS's barometric altimeter rise a few hundred feet elevation as a storm rolled in... So if the OP's DC has an "auto elevation" feature using barometric pressure, I could see it being possible for the computer to make such a mistake...

    Maybe @DIVEWATCHDOCTOR can chime in as to whether or not that is actually a possibility in this case...
     
  6. BLACKCRUSADER

    BLACKCRUSADER Barracuda

    # of Dives: 5,000 - ∞
    Location: Taiwan
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    My Perdix at 3275m altitude or 10745 feet

    3275M DIVE PRESSURE.jpeg



    3275M DIVE.jpeg
     
  7. dmaziuk

    dmaziuk Regular of the Pub

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    The Fine Manual says 2G has an "altimeter", samples "altitude" every 60 seconds even when the display is off, and automagically resets its altitude.
     
  8. Searcaigh

    Searcaigh Chromodoris gordonii Staff Member ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Dubai, UAE
    5,740
    4,481
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    The pressure sensor could be the problem.

    I had to retire my Suunto HelO2 a couple of months ago which I used in gauge mode strapped to one of my flat arms on my camera housing. I liked the large font on it, anyway I still rely on Shearwater for my dives.
     
    Dark Wolf likes this.
  9. Dark Wolf

    Dark Wolf Solo Diver

    # of Dives: 200 - 499
    Location: SW Missouri
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    I figure that is exactly what is wrong with mine, and the OP's.

    DW

    Edited for spelling
     
    Searcaigh likes this.
  10. Bob DBF

    Bob DBF Solo Diver

    # of Dives: I just don't log dives
    Location: NorCal
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    I’d first call and have a talk with tech that worked on it, and find out what he found when working on it.
     
    Dark Wolf and CuriousRambler like this.

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