How to change imu rate in pixhawk

I already use ins_log_bat_cat = 150 ,however , it doesn’t work in pixhawk.
not the frequency like 150.
the frequency of ACC and Gyr looked like 1000hz.
I suspect that I received IMU raw data,but , when i close IMU_RAW
there are no acc gyr data.
Is my LOG_BITMASK wrong?
my LOG_BITMASK = 655358