MAG MAGNITUDE Readings doubt

Static, Dynamic, Log File Analysis, Troubleshooting

Re: MAG MAGNITUDE Readings doubt

Postby leandrolb » Wed Nov 27, 2013 1:25 am

Picture from the mount.
Attachments
image.jpg
From top without board
image.jpg
image.jpg
Leandro Barancelli - Brazil
Hexacopter - AQ - frame Tarot 810 - 15x5 carbon fiber props - motors Tarot 4114 - 6S 10000mah
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Re: MAG MAGNITUDE Readings doubt

Postby leandrolb » Wed Nov 27, 2013 1:45 am

Closer picture of the magnenics sensors.
Attachments
image.jpg
image.jpg (305.49 KiB) Viewed 6054 times
Leandro Barancelli - Brazil
Hexacopter - AQ - frame Tarot 810 - 15x5 carbon fiber props - motors Tarot 4114 - 6S 10000mah
leandrolb
 
Posts: 32
Joined: Thu Jul 11, 2013 7:46 pm

Re: MAG MAGNITUDE Readings doubt

Postby leandrolb » Wed Nov 27, 2013 2:26 am

Hi Jussi,
Here is the Mag Magnitude log with the board out of the frame in my hand. First I turn north and South in my owns axis and it repeat the same readings. After I turned left and Right, up and down and I had the same result as you can see in the log below.
Attachments
MAG Magnitude outside of the ofice with the board out of the aircraft.JPG
Leandro Barancelli - Brazil
Hexacopter - AQ - frame Tarot 810 - 15x5 carbon fiber props - motors Tarot 4114 - 6S 10000mah
leandrolb
 
Posts: 32
Joined: Thu Jul 11, 2013 7:46 pm

Re: MAG MAGNITUDE Readings doubt

Postby leandrolb » Wed Nov 27, 2013 2:40 am

Here is some weird curves after calculations upload I frost the board again and here is the log of the IMU_Rate with board at position one corner below.
Attachments
Log file defrost with calibrated file in IMU_RATE.PNG
Leandro Barancelli - Brazil
Hexacopter - AQ - frame Tarot 810 - 15x5 carbon fiber props - motors Tarot 4114 - 6S 10000mah
leandrolb
 
Posts: 32
Joined: Thu Jul 11, 2013 7:46 pm

Re: MAG MAGNITUDE Readings doubt

Postby JussiH » Wed Nov 27, 2013 11:33 am

Ok, I suspected that your Z-mag had "tombstoned" but its not the case.

Can you do a short log with the board out of the frame, and turn it slowly 360 on all axises.

It looks like you may have a failing mag, if thats the case, I will replace that board. But the log file will show for sure.

The rate plot shown above looks like its having a condensation glitch.
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Re: MAG MAGNITUDE Readings doubt

Postby leandrolb » Wed Nov 27, 2013 4:50 pm

Hi Jussi,
Here is the log from the 3 axis turning the board 360º.
Attachments
Turning the board 360.PNG
Turning the board 360
Leandro Barancelli - Brazil
Hexacopter - AQ - frame Tarot 810 - 15x5 carbon fiber props - motors Tarot 4114 - 6S 10000mah
leandrolb
 
Posts: 32
Joined: Thu Jul 11, 2013 7:46 pm

Re: MAG MAGNITUDE Readings doubt

Postby JussiH » Thu Nov 28, 2013 3:33 am

Mag sensors are working fine and scale/bias is within normals for an uncalibrated board.

You could try and do the dynamic on a smaller frame or even out of the frame and still produce a flyable result that will work on the big frame. It wont be the ideal, but will probably still fly good even with some Bias in the mags. The UKF is pretty powerful.

Recently, I have dropped to have any peripherals liker wireless links and servos connected when I do dynamic files. I dont see a difference, except that I have less problems with noise that screws with Sim3.
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Re: MAG MAGNITUDE Readings doubt

Postby leandrolb » Thu Nov 28, 2013 11:24 am

Should I include the gimbal, FPV transmiter and becs in the smaller frame?
Leandro Barancelli - Brazil
Hexacopter - AQ - frame Tarot 810 - 15x5 carbon fiber props - motors Tarot 4114 - 6S 10000mah
leandrolb
 
Posts: 32
Joined: Thu Jul 11, 2013 7:46 pm

Re: MAG MAGNITUDE Readings doubt

Postby JussiH » Thu Nov 28, 2013 7:48 pm

No, I would try and leave them out or at least unconnected. Perhaps you can do that on the big frame first to see if you can get a better result. This should get you int the air, and from there you can begin to work out if any of your peripherals is causing noise or magnetic field warp by simple trial and elimination process - add the peripherals 1 at a time and use the logs to see if it creates noise in flight.
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Re: MAG MAGNITUDE Readings doubt

Postby leandrolb » Thu Nov 28, 2013 8:23 pm

Thank you I will post the result later.
Leandro Barancelli - Brazil
Hexacopter - AQ - frame Tarot 810 - 15x5 carbon fiber props - motors Tarot 4114 - 6S 10000mah
leandrolb
 
Posts: 32
Joined: Thu Jul 11, 2013 7:46 pm

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