I have done proper initial tune setting and callibration. i have also performed the first flight mentioned in the ardupilot documentation. but still i am not getting proper notch frequency.
i even checked hardware and flashed the firmware again but still the same thing.
i have 24 inch drone with low pass filter set to 20Hz. The Pixhawk is mounted over a damper.
Because you have misconfigured the parameters to log data. Set the log bitmask back to default or in any case disable Raw IMU. Then disable both INS_LOG_BAT_MASK and INS_LOG_BAT_OPT. Then set INS_RAW_LOG_OPT,9
Tuning is poor. Why did you reduce the ATC_RATE parameters from default? This is typically not right for any craft. And, the vertical acceleration controller gains are at default.