Re: Need Help: Data acquisition by ADIS16135 MEMS gyroscope

Thanks for posting this update.  That helps a lot.

1. Yes, I can confirm that the data in the GYRO_OUT column is in deg/sec.
2. I used a standard deviation on your data and came up with the same number you did for total noise. Assuming you are not using any filtering, the ~0.21 deg/sec is within the typical specification of 0.27 deg/sec-rms.
3. When the decimation filter is not in use, the GYRO_OUT2 contents do not matter.
4. The GYRO_OUT2 data is not represented in a useful manner, when using scaled data.
5. If you need >16-bit resolution of data on the gyroscopes, use the following process: 
   1. Use un-scaled option (check box in Datalog menu)
   2. Convert decimal numbers in GYRO_OUT and GYRO_OUT2 columns into binary numbers.
   3. Shift GYRO_OUT result 16-bits to the left
   4. Add GYRO_OUT and GYRO_OUT2 registers.
   5. Shift result to the right by the number of bits that are relevant, per Figure 14 in the ADIS16135 datasheet
   6. Convert that twos complement number to a decimal equivalent
   7. Multiply it by the scale factor (also from Figure 14)
      
6. Keep in mind, this is an old software package and system, which we are not actively maintaining.  The EVAL-ADIS and IMU Evaluation software packages are the preferred tools for the ADIS16135 now.  It would appear like you can make your existing tools work, but I wanted to let you know why we have not addressed the weakness in the GYRO_OUT2 representation.
7. You cannot calculate sensitivity from this noise data.  Just use the nominal value of 0.0125 deg/sec when using unscaled data for GYRO_OUT.

Does that help?

Best,

NevadaMark