3.5.3. Executing a Geometric Variation Check Execute a geometric variation check. If the geometric variation value is within the allowable range, there is no need to perform the calibration steps in 3.5.4 and later. 27 Step Description Window image, diagram 1 Open the Camera Image Input AOS processing item. ▼ In the Input parameter tab page, confirm that Unit ref number matches the unit number of the Camera Image Input AOS processing item set in 3.5.2. 2 Open the Geometric var. check tab page. Confirm that Tolerance (Upper Value) is set to the recommended value (0.1).