LIS3DH spike in acceleration value

[hani naanaa]

Posted on April 10, 2018 at 17:13

I have been doing some testings recently with the LIS3DH accelerometer to measure machine vibration, and I have come across 2 things. I am using the accelerometer to sample 512 points at a 1.1Khz sampling rate. I have it set a normal mode, with ODR =1.3Khz, out of the 512 points I sometimes get 1 or 2 outlier points with very different values from the rest, it seems to happen randomly but I am not sure of the source (picture attached).

My second question is about the accelerometer's natural frequency as i could not find it in the datasheet.

Regards.

#lis3dh-machine #lis3dh

[Miroslav BATEK]

Posted on April 11, 2018 at 09:48

What is the sensor configuration? Did you enable BDU?

The information about accelerometer's natural frequency cannot be shared on the forum.

[hani naanaa]

Posted on April 11, 2018 at 15:29

Yes BDU is enabled, BLE (0), HR disabled.

Is it at least possible to confirm that the natural frequency is over 1Khz ?

[Miroslav BATEK]

Posted on April 12, 2018 at 10:25

I think the outliers can come from the machine or environment. To check there is not problem with the sensor itself, configuration or you program, try to collect data when the sensor will be still.

Yes, the natural frequency is above 1kHz.