hallmark007
Captain
Flight distance : 9812789 ft
Ireland
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Geo_Drone Posted at 1-19 00:50
1. IMU should NOT BE recalibrated as long as the drone does NOT REQUEST it...the best calibration is from factory, is hard to achieve the same calibration in home environment, as for calibration is used "cold rooms". Only Compass must be recalibrated when needed, also gimbal (on my E2P and E2E I have made only 2 times Compass and Gimbal calibration in 1 year, as was far away from initial compass calibration).
2. IMU should be COLD when you calibrate it as the metals are working very different at temperature (initial factory IMU is made in cold rooms, so you need to lower temp at around 7-10 degrees before calibration...Also HALLMARK, you do not have humidity in refrigerator, cold environment = lack of humidity. Also when you take it out from refrigerator, there is no such powerful humidity to affect the circuits (you leave the drone in refrigerator for a few minutes to reach 5-7 degrees C, not half hour). And as a fact, this advice is from Ken Booth, the one that was supervisor of DJI testing team...and I believe he knows what is talking about, better than a person with Zero training in this area but with many "opinions".
3. The main problem for any of us that WORKS with the drones and do not fly as recreation, is to work without problems at BASIC things: GPS, Gimbal, Video link stability. We don't give a damn about everything else like MS, OA, Follow me...That is what any reasonable person should understand...Any problems on one of this 3 basic things will ruin a contract...and in Commercials sometimes you have the opportunity to repeat the shooting, but sometime you just loose money...
More lies and ridiculous comments. You don’t ever put your drone in a fridge EVER.
And ken booth was a moderator on this forum, not the leading dji tester. And many of us who were on the forum at that time know him well. He was a moderator full stop ….
These were written by me and they are correct.
Tip To Help Avoid compass interference and crash.
1/ Never calibrate Compass unless prompted to. Your compass will always prompt to calibrate if it needs it .
2/ start AC leave until you receive enough gps lock ,
3/ if you get Compass interference turn off AC and move to another location,
without interference.
4/ In bottom left hand corner on your map you will see small red triangle, check to make sure that this triangle is pointing in the same direction (heading) as your AC, this will show good compass on the ground.
Raise AC to height of 8ft
Hover for 20 seconds
Fly forward 2ft
Backward 2ft
Left 2ft
Right 2ft
Up 2ft
Down 2ft
Yaw left
Yaw right
Each time returning to hover position
If you have a good horizontal each time, you will then know you have good GPS good IMU and good Compass, and your ready to fly.
IMU "Inertial measurement unit" .
As far as I see it, IMU calibration on a level surf as a reference for a level stationary hover. From there the craft responds predictably to flight commands. It also likely measures any sensor noise and thermal drift so that these technical imperfections are accounted for when using IMU sensor data in flight. - this is likely why there must be no vibrations during the calibration process.
Bad IMU calibration could cause drift and attitude issues as the flight controller fights to hold the craft in what it thinks is the correct attitude as opposed to the correct physical attitude.
The IMU usually has 2 types of sensors – angle and acceleration and in turn 3 sensors of each type measuring in the X,Y and Z axis. These sensors can, through vibration, aging, impact etc, drift in their response over time and thus an IMU calibration will establish a new reference for the IMU’s level/stationary state that the flight controller can work with to restore stable flight.
Think of calibration as the bringing back into line the measured craft attitude with the true physical craft attitude.
As to how often an IMU calibration is needed, Refer to your manual and never put your drone in a fridge.
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