Meaning
Standardization procedure ensuring camera sensors and lighting arrays match a physical reference scale. Performing automated optical inspection calibration involves measuring a known glass artifact to verify the resolution of the imaging system. This process establishes the pixel-to-millimeter ratio across the entire field of view and corrects for lens distortion.
It applies only to the spatial accuracy of the machine vision system and does not cover the electrical testing of the board.
Verification Standard
Traceable masters provide the absolute coordinates needed for spatial accuracy. An automated optical inspection calibration uses these etched patterns to adjust for lens distortion or lighting non-uniformity. Every sensor in the array must report dimensions within the defined tolerance.
Sensors that fail this check require mechanical adjustment or software offset updates.
System Fidelity
Thermal stability affects the optical path during extended operation. Frequent automated optical inspection calibration prevents drift in the reported positions of surface mount components. A controlled environment helps maintain the alignment between the camera gantry and the circuit board.
Measurement Threshold
Success is determined by the repeatability of the measurement across the entire inspection area. The automated optical inspection calibration report logs the delta between the measured value and the master value for every camera. This document supports the final quality audit of the production line.
