vibration sensor adxl 362

Hi all.

I have an adxl362 board I’m trying to make some kind of vibration meter. Iv got it reading the value then after 10mili reading the value again and subtraction the first value from the latest read value to determine a change. The values mean nothing if I don’t use this method with the raw data, the value can just add up them self’s and means nothing without a reference

Is there a questions in there somewhere?

Yes is this the correct way to use it?