Compass 2 high numbers

ArduCopter Copter 3.2
1

When calibrating the compass, compass one has low numbers but compass 2 has very high last number. It flies good but seems to be twitchy on yaw? Ran auto log analyzer and this is the results.

Log File C:/11292014.log
Size (kb) 4666.240234375
No of lines 61837
Duration 0:04:16
Vehicletype ArduCopter
Firmware Version V3.2
Firmware Hash c8e0f3e1
Hardware Type
Free Mem 0
Skipped Lines 0

Test: Autotune = UNKNOWN - No ATUN log data
Test: Balance/Twist = GOOD -
Test: Brownout = FAIL - Truncated Log? Ends while armed at altitude 3.97m
Test: Compass = FAIL - Large compass off params (X:-92.00, Y:-8.00, Z:-172.00)
Large compass offset in MAG data:
Z: -172.00
Large change in mag_field (87.75%)
Max mag field length (553.74) > recommended (550.00)

Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = GOOD -
Test: GPS = GOOD -
Test: IMU Mismatch = GOOD - (Mismatch: 0.18, WARN: 0.75, FAIL: 1.50)
Test: Parameters = GOOD -
Test: PM = GOOD -
Test: Pitch/Roll = GOOD -
Test: Thrust = GOOD -
Test: VCC = GOOD -

2

Those offsets don’t look too bad to me. Have you updated Mission Planner? Can you check for updates?

There was an issue where the log analyser was falsely reporting anything over 150 as being too high. But that was supposed to have been fixed.

3

I will check for a new version of MP. Under the Arducopter instrction page it says “The final offsets will be displayed (3 numbers for each compass), if all these numbers are below 250 then you can assume they are good.” That is why I was concerend.

Which compass is 1 and which is 2? Internal/ External

4

IIRC, if you have an external compass, then it is 1, and internal is 2. If you don’t have external, then the internal is 1.