[LSM6DSOXTR] Bias drift

[ruig25]

Hello!

I took two attemps and recorded measurements in steady state (2 and 3 hours) that i want share.

Config:
G/XL FS: default 
ODR 104Hz

Sensor data polled at rate ~ 90Hz

Some standby/wakeup stuff:
TAP_CFG0 (56h) = b0101.0001

TAP_CFG2 (57h) = b1000.0000

WAKE_UP_DUR (5Ch) = b0100.0000

WAKE_UP_THS (5Bh) = b0000.0001

MD1_CFG (5Eh) = b0010.0000

Can the bias drift be explained somehow?

Many thanks

[Federica Bossi]

Hi @ruig25 ,

It is a very little drift but looking at your data you can see a correlation with the temperature varying by 4 °C, when the temperature settles even the sensor outputs do not drift.

I recommend that you try to keep the temperature constant.

[ruig25]

I think I will try to write polynmial function for bias drift and mems temp as parameter using real measurements because the device supposed to be used from ~+10°C to +40°C.

In the datasheet zero-g +10 mdps per +1K. And vice versa i suppose: -10 mdps per -1K.


and sensitivitiy +0,007% or -0,007% (not 0,7%?) per +1K

Last measurements.

 

Earth gravity vector also affects stedy state measurements. Bias drifts about 10 mdps depending on sensor position.