Compassmot ended without a result

What ArduPilot says:

• Failed

The motor interference test stopped before it had measured anything. No correction was saved, and COMPASS_MOTCT is set to 0 (none). With a current sensor the test learns only while the battery current is 3 A or more; without one, while the throttle is above zero.

What to do, most likely first

1. The throttle was never raised far enough for the current to reach 3 A.

   FixRun the test again: raise the throttle slowly to about half, hold it a few seconds, lower it, then finish. Fix the copter down first: the motors spin.

2. The test ended at once: the ground station sent another command, or a compass dropped out.

   FixStart it again and do nothing else in the ground station until it is done. If a compass keeps dropping out, check its cable.

3. The current sensor reads zero although the motors run.

   CheckThe battery current in the ground station stays at 0 A with the throttle raised.

   FixSet up the battery monitor first (BATT_MONITOR and the current calibration BATT_AMP_PERVLT), then repeat the test.

Parameters to look at

Where to do it:Setup & Tuning Guide