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Best Practices for the Stage Speed on a Keysight 5DX Automated X-ray Inspection System

The following information pertains to:
Series 3 and Series 5000 systems only. Series I, II, and 2L are using stage speeds 1 to 10. Do not use stage speeds 1 to 10 for Series 3 and Series 5000 systems.

The Keysight 5DX Automated X-ray Inspection Online Help tool tells users to start from the lowest stage speed and step the speed up until false calls due to vibration occurs. Then step it back until the vibration false calls are gone. This is an effective way to find the right stage speed for the size of the board being inspected however, it may not be the fasted method. One quick way is to learn from others and use the View Verifier for additional help.

Several experiments, including some done by Keysight, concluded that stage speed 12 to 16 should be considered for large boards where large boards are considered 14x16inches or 35x40cm and above. As a best practice, use 16 as the initial stage speed. Many users are using this for large boards.

While reviewing your field of views (FOVs) for correct surface map or auto-board thickness setup, take note of any view that vibrates or bounces. Board bounce can be observed in View Verifier because it uses the stage speed setting. The stage moves from one FOV to another and snaps an image of the FOV. When a poor image is acquired, check for bouncing by clicking the camera “Live” mode. If it focuses, then there is bouncing.

Decrease your setting based on how focused the FOV’s are. If you did not see any bouncing, then proceed to fine tuning and try higher speeds later by observing the false calls due to board vibrations after fine tuning is completed. Time is saved on trying 12 to 15 and the value will probably end up on 16, 17 or 18 and is unlikely to be 19 or 20 based on those experiments. On the other hand, if bouncing occurs, then time is still saved on trying 17 to 20. For smaller boards, the user can start at a higher stage speed, 18. Then follow the same steps as above.

By following this method, a user can also be sure that when the fine tuning steps are done nominal values are obtained from the best image focus that can be set.

Another thing to note is that board bounce can be caused by the carrier. If the carrier is not rigid enough. So if you are using one, eliminate this possibility first before trying those suggestions.

More information on stage speed can also be found in the What is Stage Speed and how does if affect my Test Tmes on the 5DX