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ADXRS810 error when Gyro is static ?

Hi ADI Expert,

Our customer would like to use ADXRS810 for automotive navigation.

But we found out that Overall Null Accuracy seems quite high for application.  (+- 8 °/sec, customer target is >1 °/sec)

I don't know whether do I misunderstand the meaning of Null Accuracy.

Does it means the dynamic error we may see from Gyro output even when the sensor is static?

And what's the different between Null accuracy and Root Allan Variance of gyro sensor?

And why this Null accuracy spec is not specified in ADXRS290? Is possible to get more spec of ADXRS290?

Thank you very much!