remains at the center of the crosshair as the magnification is lowered.
7. Report any observed discrepancy. If the error is verified, contact your SKE representative for authorized service.
8.3.3 Zoom Optics Squareness
Squareness refers to the alignment of the camera relative to the motion of the metrology stage. If the camera is misaligned (out of square), an image will appear to drift diagonally across the video image as the stage position is moved along one axis.
Checking Squareness
To check squareness, perform the following steps:
1. Place the magnification checker or other suitable inspection part on the stage and secure properly. 2. Select the crosshair image tool in software and verify that it is at its defined center position. Refer to the Mx200 Software User’s Guide for details. 3. At low magnification, select a point-like feature such as a corner or the standard ’s X-Y origin. Using the stage, position it to the center of the crosshair.
4. Zoom to high magnification, then refocus and re-center the point as needed.
5. While observing the feature, slowly move the stage X axis ONLY. (Do not move the stage Y axis.) Verify that the point remains aligned on the X axis of the crosshair as the feature is moved to the left and right within the field of view. 6. Report any observed discrepancy. If the error is verified, contact your SKE representative for authorized service. 8.4 Verifying the System Calibration Calibration should be performed at least monthly and should be verified periodically depending on user requirements and systems usage. A 200mm linear standard is recommended for calibration verification. The calibration artifact is available from SKE authorized distributors or directly from the SKE service department. See “Spare Parts” later in this document. Calibration should also be verified after the system has been serviced or moved. The following is a brief description of the steps recommended for the verification of your machine.
To validate calibration, perform the following steps:
1. Place the calibrated verification standard on the glass stage. Secure the standard with hot melt glue or other suitable retaining method so that stage translation cannot move the standard under any condition. 2. Skew the center of the two end circles. Refer to the MetLogix M3 Video and FOV Inspection Software User’s Guide for detailed information.
3. Measure from left to right and then up to down.
4. Repeat these measurements three times.
5. Calculate the absolute average deviation for each of the two groups of distance measurements. The absolute averages should be within factory system specifications and be derated for the environment and calibration errors.
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