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Enabling and disabling FDS bit shows unexpected result in the axis magnitude

elange
Associate II

Hello STMicro Community,

I am working with the LIS2DH12 accelerometer, STEVAL-MKI109V3 and MEMS Studio environment. My application is the measurement of vibration on rotating equipment.

A vibration signal of 118Hz is being applied to the board and using ODR=400Hz, Scale +/-4g.

I am noticing a significant difference in magnitude measurements when switching the filter bit on vs off (FDS). See attached image of the time series data yellow (Z-axis) where:

- with FDS=0 I see -500 to -1500 for ~1000mg range

- with FDS=1 I see -800 to +800 for ~1600mg range

I DO expect to see gravity getting removed but NOT an increase in the magnitude. Is there an explanation for this?

-Edwin

 

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