Hi everyone,

 

I'm experiencing a strange issue on a Nikon iNEXIV VMA 2520 running CMM Manager on Win7 and I'm hoping someone here has seen something similar.

 

The problem:

When I run a measurement program in automatic mode, certain measurement windows (ROI) are displaced from their correct position by a few millimeters, consistently toward the bottom-right. However, when I run the exact same program line by line (step-by-step / manual simulation mode), every single measurement is performed exactly where it was programmed — no offset at all.

 

Key observations:

- The camera physically moves to the correct position

- Only the measurement ROI/window is shifted (bottom-right direction, a few mm)

- The issue affects only certain measurements, not all of them

- The offset appears consistent in direction and magnitude each time

- No objective change is involved — only contrast adjustments, which work fine

- I added a DELAY/DWELL before the affected measurements to rule out a stabilization issue → no change, the offset persists

- Z-axis focus is not a factor in our measurements

- The part is centered in the field of view

 

What I've ruled out:

- Mechanical stabilization / settle time (delay added, no effect)

- Objective change offset

- Lighting / contrast issues

- Z-axis errors

 

My current hypothesis:

It seems like in automatic execution mode, the ROI position is being calculated from theoretical/nominal coordinates rather than from the camera's actual real-time position — whereas in step-by-step mode, the ROI is recalculated from the current physical position of the camera.

 

Has anyone encountered this behavior? Could this be a known bug or a specific setting in CMM Manager that controls how the ROI position is referenced during automatic execution?

 

Any help would be greatly appreciated.

 

Machine: Nikon iNEXIV VMA 2520

Software: CMM Manager win7

Head: Optical (non-contact)

 

Thank you !