I would like some clarification about the use of BMM150 magnetometer. I would like to kwow after installation, if there is a deviation of the measure of the magnetic field ? or the error remains constant ?
My question is to know if new calibrations are necessary after installation and if yes, how to know the frequency of the calibrations ?
You don't need to calibrate BMM150 after you solder it on your PCB. You need to run self-test to see if BMM150 is working or not after PCB assembly. You may also need to check if BMM150 x/y/z data is not saturated on your PCB meaning that you don't have other strong inductor or metal screws near BMM150.