(I already posted this on the "other" board but thought it was important enough to post it here as well. I did a search here and on the other board trying to find out what I should do if the compass mod value in the advanced IMU calibration was over the acceptable range and couldn't find anything but degaussing.)
I spent many hours today trying to properly set-up my new P3Pro. This is my 3rd Phantom, a P2V+ and two P3Pro's. I fly a lot and have quite a bit of experience with these birds. I'm pretty thorough and careful with my birds and take my time making sure they're set-up properly before they ever hit the air. As part of the initial set-up I think it's wise and prudent to do an advanced IMU calibration, a gimbal/camera calibration, an RC calibration and a good compass calibration. I've done all of these functions many times before so it's no big deal.
Today I received a new P3Pro. I did as I always do and carefully unboxed everything, got all of my numbers and documents photographed and in order. I charged my RC and new battery. Once the charging was completed, I fired up everything and registered the bird with DJI. Checked all of the basic settings and changed them to my normal preferences. I figured I'd wait until the wife and dogs went to bed and then I'd do the calibrations so there wouldn't be any movement.
It's nice and cold out (27F) so I figured I could get a good cold IMU cal first. I left the bird outside (minus the battery and SD card) for about a half an hour and set up my perfectly level, wood table in the center of a large room with no chance of interference. I brought the cold bird in, set it up on the table, fired up my Tablet and RC and then the bird. I went directly into the IMU calibration screen and noticed the compass mod was floating around 1,920 to 2,100 (way higher than the norm of 1,500-1,800) and hit the cal button. During the cal the numbers stayed in that unacceptable range. Cal completed at about 1,950, no good. The other mod numbers were good. I figured I'd just give it another go. Half an hour outside and back at it, same result. I started searching the threads and couldn't really find much on it.
Long story a little bit shorter, I did it another couple of times then got another P3Pro to check it (maybe the environment was somehow screwed up?). I fired up the other P3 and it checked out good at about 1,550. I figured I'd try it one more time and if I couldn't get it I'd get it picked up by Amazon Prime (you've gotta love Amazon Prime!) in the morning. No good again, same result. As a last ditch effort I figured I'd go ahead and do a regular compass cal. Got a good compass cal, went into the IMU screen and bingo! Mod value is now around 1,580! Shut her down, put her back outside to let it get cold, brought it in, did the cal and all is good at about 1,540. Did the rest of my set-up with no further issues.
The moral of the story, if your numbers are off, do a compass cal before you do the advanced IMU cal or you could be the next one up until 3:00am trying to get it done! Hope it helps someone in the future.
Jerry
I spent many hours today trying to properly set-up my new P3Pro. This is my 3rd Phantom, a P2V+ and two P3Pro's. I fly a lot and have quite a bit of experience with these birds. I'm pretty thorough and careful with my birds and take my time making sure they're set-up properly before they ever hit the air. As part of the initial set-up I think it's wise and prudent to do an advanced IMU calibration, a gimbal/camera calibration, an RC calibration and a good compass calibration. I've done all of these functions many times before so it's no big deal.
Today I received a new P3Pro. I did as I always do and carefully unboxed everything, got all of my numbers and documents photographed and in order. I charged my RC and new battery. Once the charging was completed, I fired up everything and registered the bird with DJI. Checked all of the basic settings and changed them to my normal preferences. I figured I'd wait until the wife and dogs went to bed and then I'd do the calibrations so there wouldn't be any movement.
It's nice and cold out (27F) so I figured I could get a good cold IMU cal first. I left the bird outside (minus the battery and SD card) for about a half an hour and set up my perfectly level, wood table in the center of a large room with no chance of interference. I brought the cold bird in, set it up on the table, fired up my Tablet and RC and then the bird. I went directly into the IMU calibration screen and noticed the compass mod was floating around 1,920 to 2,100 (way higher than the norm of 1,500-1,800) and hit the cal button. During the cal the numbers stayed in that unacceptable range. Cal completed at about 1,950, no good. The other mod numbers were good. I figured I'd just give it another go. Half an hour outside and back at it, same result. I started searching the threads and couldn't really find much on it.
Long story a little bit shorter, I did it another couple of times then got another P3Pro to check it (maybe the environment was somehow screwed up?). I fired up the other P3 and it checked out good at about 1,550. I figured I'd try it one more time and if I couldn't get it I'd get it picked up by Amazon Prime (you've gotta love Amazon Prime!) in the morning. No good again, same result. As a last ditch effort I figured I'd go ahead and do a regular compass cal. Got a good compass cal, went into the IMU screen and bingo! Mod value is now around 1,580! Shut her down, put her back outside to let it get cold, brought it in, did the cal and all is good at about 1,540. Did the rest of my set-up with no further issues.
The moral of the story, if your numbers are off, do a compass cal before you do the advanced IMU cal or you could be the next one up until 3:00am trying to get it done! Hope it helps someone in the future.
Jerry