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ADXRS290 Offset Error

Dear Sir or Madam,

 

Could you please expand a bit on the "Offset Error: +/- 9 Degrees/Second"  specification of the ADXRS290?

 

Going through Analog Devices range of gyroscopes, it seems that an Offset Error specification is unusual for a gyroscope. Is Offset Error another phrase for Null Accuracy perhaps? If not, what is the Null Accuracy of the ADXRS290?

 

Many thanks.

 

M Atwya

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  • I am sorry about the confusion.  Across the industry, there has been quite a variation of approach on specifying this behavior.  The original author of this datasheet is no longer employed at ADI, but I  think that we can help.  The terms "bias," "null" and "offset" tend to represent the same thing:

    • what variation can I expect in its measurement of angular rate, across a given set of conditions and across a population of parts?

    Does that help?

  • Resurrecting this thread. Does "what variation can I expect in its measurement of angular rate, across a given set of conditions and across a population of parts?" mean that:

    (a) the output is scaled, and can be off by up to 9 deg/s on either + or - end of the scale (100 deg/s),

    or does it mean that

    (b) the zero-point (ie no motion) could be read as up to +/- 9 deg/s, but outside of this zero-point-offset, response is ~linear per other specs?

    Thank you :)

  • Hi JCSO, 

    this refers to the offset/bias for the no motion condition. If the offset is +2deg/s, when rotating at +50deg/s, the sensor would read 52deg/s. 

    I hope it helps, 

    Pablo. 

  • Thank you, Pablo Slight smile

    At a fixed temperature/humidity/etc, for the same device, does this offset/bias remain consistent? Or, can it change over time?

    I ask, because for the application I'm considering this for, the full-scale signal we're interested in is about +/-10 deg/s (even though the device goes to 100 deg/s).

    +/-9 deg/s bias is fine, if we can calibrate it out for each device, but will be more challenging to use if the bias changes substantially.

  • Hi JCSO, 

    the bias does change with temperature, figures 5 and 8 of the datasheet show the sensor output vs temperature for multiple parts. 

    Pablo. 

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