MEMS Inertial Sensors

Q&A adxrs642 or Adxrs646 is better for AHRS?

adxrs642 or Adxrs646 is better for AHRS?

Electro4095

on Apr 6, 2019

Hi,

The adxrs642 and Adxrs646 are low price gyroscopes. i'm confused to choose one of them for my IMU/AHRS!!

the ADXRS646 have better performance(12°/hr bias stability) but ADXRS642 have more better temperature stability.

also in ADXRS646 data sheet Application did not mention IMU!

please somebody help me ;)

0 NevadaMark

on Apr 6, 2019 12:07 PM
What type of intertidal conditions will your AHRS need to operate through? In particular, maximum angular rates and vibration might be useful in this consideration. With respect to the temperature dependence, is the ADXRS642 performance good enough to avoid calibration?
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0 Electro4095
on Apr 7, 2019 8:03 AM in reply to NevadaMark
Thanks for reply,

Maximum angular rate is 250 Degree/s and maximum 5 g vibration.

No it's not enough and i need to calibrate offset drift, but i can not calibrate sensitivity drift!
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0 NevadaMark

on Apr 8, 2019 6:47 PM in reply to Electro4095
In general, we would expect better performance from the ADXRS646, but what temperature range does your AHRS need to support?
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0 Electro4095
on Apr 9, 2019 7:47 AM in reply to NevadaMark
In the wore case scenario -20 to +60 Celsius
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