Fiducial Capture MV2F/CP-4-3

We are using PCBs of CEM3 Material with bare copper fiducials. The whole board is of bare copper with a lacquer coating (Coats brother S2974). The fiducials are of 1 mm diameter bare copper. we use Panasert MV2F as well as FUji CP4-3. In both the machines intermittently fiducials could not be captured. We have played with the shading & Binery vision. White reverse & black reverse in the MV2F. WE have played with CCD & Scan levels in CP4-3. Still could not find the root cause. Worked with Panasert to resolve this issue. They are also helpless. Does any one face this problem? Any solution/Recommendation is appreciated. Regards, Arul

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To see if the MV will recognize the marks, in the binary mode, when setting threshold (binary level), raise up the level until the edge of the mark starts to degrade. Write down the number. Lower the level until the fiducial starts to "bloom". Write down the number. If the difference is at least 30 you should have no problems. If the difference is much less than 30 there will always be problems. Always set the final level in the middle of the calculation. Don't go for the "best" (most complete)image because the machine doesn't care about anything but the edge. Hope it helps. Lance | We are using PCBs of CEM3 Material with bare copper fiducials. The whole board is of bare copper with a lacquer coating (Coats brother S2974). | The fiducials are of 1 mm diameter bare copper. we use Panasert MV2F as well as FUji CP4-3. In both the machines intermittently fiducials could not be captured. | We have played with the shading & Binery vision. White reverse & black reverse in the MV2F. | WE have played with CCD & Scan levels in CP4-3. | Still could not find the root cause. Worked with Panasert to resolve this issue. They are also helpless. | Does any one face this problem? Any solution/Recommendation is appreciated. | Regards, | Arul

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