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Documents FAQ: Testing Delta Angle Function in the ADIS16488
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FAQ: Testing Delta Angle Function in the ADIS16488

Q:

Do you have a simple way to demonstrate the delta-angle function in the ADIS16488?

--------------------------------------------------------------------------------------------------------------------

A:

Try this out:

  1. Read each Z_DELTANG_OUT and Z_DELTANG_LOW sample into a data record, while turning it 180 degrees, using its (or the PCB's) edges to line up with a table edge or something that is relatively straight.
  2. Take the summation of the entire data record. Does it match close to 180 degrees?  How close did you get?

Here are some key points for assuring best performance:

  • Synchronize data reads with the data-ready pulse.  Missed samples will eliminate the displacement estimates for the time frames that they represent.
  • Correct for the initial bias in the gyroscopes, before starting this experiment.  This bias will cause a linear accumulation of errors, with respect to time.
  • Make sure to use all 32-bits of data in the output registers.  Not all of this data is actually relevant, but using only the 16-bit register (Z_DELTANG_OUT, for example) might not provide sufficient resolution, especially when using a slow rate of rotation.

For more information on this function, check out ADIS16488A datasheet. On the present revision (Rev D), this section is located on page 15:

ADIS16488A Datasheet, Delta Angle Section Link

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