Temperature dependence, Sensor bias, Ratiometric error due to supply voltage variation and etc. These are some of the errors made by accelerometers, here’s an app note from Kionix to help you deal with it.
Although everyone would like them to be, sensors are not perfect. Understanding the accelerometer’s errors is just as important as understanding how the accelerometer works in an application. Errors can and will affect the application’s performance.
This application note explains the sources of error in Kionix MEMS tri-axis accelerometers. Suggestions are made on how to reduce or eliminate the error in the measurements. In this way, applications can be made more accurate and precise.