Why does gimbal still vibrate after calibration?
1. Gimbal Motor Overload
Gimbal's motor power overload can trigger balancing issue like the shaking. There are 2 situations that usually happen if the gimbal' motor power not on par with the weight of the camera. If the motor power gets too strong, there will be high-frequency vibration of the gimbal arm with constant noice. Once you find which motor needs to be adjusted, you touch on the "Payload Setting - Auto Adaptation - Confirm" accordingly on the touchscreen, then the gimbal will usually automatically settle down. If not, you can adjust a certain motor power yourself on Feiyu APP.
Sometimes it can be the motor power too weak for the gear, when the camera shakes more violently in a way without any noise. You can find out by holding the arm from moving to see if the vibration goes away. Then you can adjust the motor power like above, first do the whole axes auto-adaptation, or do it separately on APP.
2. Calibration Error
Follow from what I said above, doing calibration wrong can trigger malfunction of the gimbal when using. For example, when the pan axis is not well-calibrated, it takes longer on the pan orieantation to get the camera in right position like when shooting in selfie mode or Inception mode, and pan motor has to work harder to perform, which will make the motor overheat, or even damaging the motor completely if possible. And it's suggested to fix and re-balance the gimbal right away.
The sign of the wrong calibration varies when shooting due to different Feiyu models. Sometimes the gimbal doesn't work at all, enters sleep mode directly with the sound "beep", or shut down itself completely. So when this happens, don't panic, it's not something wrong with the gimbal or hardware. Simply doing all the calibration properly again and make sure the gimbal gets balanced. And turn on it to test the functionality to see if it works straight at last.