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4 min warming time!

Discussion in 'Pro/Adv Discussion' started by Sabino Diaz, Oct 17, 2015.

  1. Sabino Diaz

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    I'm just wondering how much is your IMU warming time?
     
  2. 4wd

    4wd

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    If it's too long, try calibrating the IMU after cooling the phantom somehow.
    If it's cool where you are leave it outside for 10 minutes, some will put it in the fridge for a while.
    When you do the calibration have your app ready to go and do it ASAP after starting up, as it soon gets warm just sitting.
    The rationale is that in normal start up, the internals (especially barometer) need to reach the same temperature as when the calibration was done.
     
  3. Sabino Diaz

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    The phantom is not warm, the IMU warming up starts before each flight. But before use to take less than a min, and now is taking longer. Maybe because it's getting colder outside?
     
  4. 4wd

    4wd

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    Sounds very likely.
    You can still reduce the waiting for it to warm up by doing a new IMU calibration when the phantom is cold.
     
    libertyflyer and Sabino Diaz like this.
  5. Sabino Diaz

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    Thanks for your help!
     
  6. joebar.rc

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    It's simple.. The temperature the imu was on while calibrating, is the temperature that it must reach on the next power cycle.

    So.. If you did your imu calibration while the phantom was around 25C and it is now 15C outside, it must warm up until the 25C.
    The imu sensors (gyro, accelerometers, barometer and magnetometer) values are temperature depending and during the initial calibration a matrix with temperature compensation is build up.

    So as the others said, to long to warm up, cool it down below your normal ambient flying temperature and calibrate again
     
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  7. Sabino Diaz

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    You guys are he best thank you!