Some machines are also able to measure the PCB shear by measuring a third fiducial mark on the PCB.
2.
Fiducial marks, or also known as fiducial markers, provide common measurable points for all steps in the assembly process.
3.
A separate camera on the pick-and-place head photographs fiducial marks on the PCB to measure its position on the conveyor belt accurately.
4.
Two fiducial marks, measured in two dimensions each, usually placed diagonally, let the PCB's orientation and thermal expansion be measured and compensated for as well.
मोबाइल