FAQ: Delta Angle Tutorial, ADIS16480

Q:

Can you provide an example test process for testing the x_DELTANG_xxx function in the ADIS16480?

A:

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

SUMMARY

The EVAL-ADIS, IMU Evaluation Software and a simple 180 degree turn provide a simple method for testing the delta angle function inside of the ADIS16480.

TEST SETUP

1. Attach an ADIS16480AMLZ to the EVAL-ADIS, using the steps in the follow user guide:
   ADIS1648x Wiki Guide - Physical Setup Instructions
2. Install the latest version of the IMU Evaluation Software, using the steps in the following User Guide
   IMU Evaluation Software Setup Wiki Guide

TEST PROCEDURE

1. Plug the EVAL-ADIS (with the ADIS16480AMLZ installed on it) into the PC-USB port
2. Once both LEDs illuminate, start the IMU Evaluation Software program
3. Upon start-up, select Device = ADIS16488 (not the ADIS16480)
   
4. Go into the Register Access menu and select the NULL_CFG register
   
5. Change the NULL_CFG value to 0x070A (this extends the sample time for the gyroscope null to >26 seconds)
   
6. Un-plug the EVAL-ADIS, wait 2-3 seconds, then plug it back into the PC-USB port. Try to make this as quick as possible and keep the EVAL-ADIS still during the first 30 seconds.
7. Using the Tools >> USB menu in the IMU Evaluation Software, re-connect the EVAL-ADIS to the PC:
   
   
8. Close the USB menu and go back into the Main Menu, then click on Read to observe the gyroscopes.
   
9. Stop on Stop and then go into the Data Capture Menu.
   
10. In the Data Capture menu, select the z-axis gyroscopes and delta-angle registers, then select 50000 samples, unscaled data and if needed, a unique file name for data capture:
    
11. Press the Start button and rotate the device 180 degrees, using some sort of convenient edge reference. In this case, I used the edge of my laptop and just lined it up with an edge of the EVAL-ADIS in both orientations (0 and 180 degrees).
12. Convert the Z_DELTANG_xxx data into degrees and perform a running summation, the plot the results. Please see the attached Excel file for this example, which produced the following chart
    

We hope that helps!