Accepted Solutions
Hi @NPoth.1​ ,
yes, I can share you some characterization / bench measure data -especially on the last two parameters-, since they are not in the datasheet:
- Scale factor: the LSM6DSM is digital, so the exact conversion factor from voltage to digits depends on the internal ADC. However, the sensitivity -that depends on the selected Full Scale-, is defined in the datasheet, p.23: for the accelerometer, (milli)g stands for 9,81m/s^2 (/1000), the Earth gravity acceleration, while dps stands for degree per second. For example, in the FS=2g case the accelerometer sensitivity is 0.061 mg/LSB, meaning that a variation of 1 bit in the data output refers to an increase of 0.061 milli-g sensed.
- Axis misalignment (i.e. "cross axis" parameter, or non orthogonality):
- For the accelerometer (X to Y, X to Z, Y to Z):
- For the gyroscope (Pitch to Roll, Pitch to Yaw, Roll to Yaw):
- Bias stability:
- For the accelerometer:
- For the gyroscope:
If my reply answered your question, please click on Select as Best at the bottom of this post. This will help other users with the same issue to find the answer faster.
-Eleon
Hi @NPoth.1​ ,
yes, I can share you some characterization / bench measure data -especially on the last two parameters-, since they are not in the datasheet:
- Scale factor: the LSM6DSM is digital, so the exact conversion factor from voltage to digits depends on the internal ADC. However, the sensitivity -that depends on the selected Full Scale-, is defined in the datasheet, p.23: for the accelerometer, (milli)g stands for 9,81m/s^2 (/1000), the Earth gravity acceleration, while dps stands for degree per second. For example, in the FS=2g case the accelerometer sensitivity is 0.061 mg/LSB, meaning that a variation of 1 bit in the data output refers to an increase of 0.061 milli-g sensed.
- Axis misalignment (i.e. "cross axis" parameter, or non orthogonality):
- For the accelerometer (X to Y, X to Z, Y to Z):
- For the gyroscope (Pitch to Roll, Pitch to Yaw, Roll to Yaw):
- Bias stability:
- For the accelerometer:
- For the gyroscope:
If my reply answered your question, please click on Select as Best at the bottom of this post. This will help other users with the same issue to find the answer faster.
-Eleon
Hi @NPoth.1​ ,
you are welcome.
For the bias stability, the observation period is 72h.
For the accuracy/precision parameter, I can share you the sensitivity error in non linearity:
For the bias stability, I expected an "observation time" in second. For me, the "observation time", is the value on the x-axis (tau) where the Allan variance is smaller.
For the accuracy/precision parameter of accelerometer, thanks, you answer my question.
What about the accuracy/precision parameter of gyroscope ?
Hi @NPoth.1​ ,
ok, I was thinking to the whole acquisition time. Yes, the tau unit measure (average time) is seconds.
>> What about the accuracy/precision parameter of gyroscope?
For the gyroscope I can share you the NL in the +-2000 dps case:
Other questions? :grinning_face_with_sweat: ;)
-Eleon
