Starrett Automatic Video Metrology System AVR200

• While not always strictly necessary, it is recommended that the calibration verification described in this section be performed periodically depending on user experience.

• A linear calibration verification standard (200mm linear standard) artifact is available from Starrett authorized distributors or directly from the Starrett service department. Refer to “Spare Parts and Accessories” later in this section for additional information.

• 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 in one the six positions on the glass stage as shown in the previous figure. 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 the distance between the 1st and 2nd, 1st and 3rd, 1st and 4th, 1st and 5th, and the 1st and 6th fiducials.

4. Repeat these measurements three times.

5. Calculate the absolute average deviation for each of the six groups of distance measurements.

Work area is clean, dry, and free of debris

No loose items around the system and metrology stage

Electrical power cords are plugged into a grounded power source and are unobstructed

Sign off on the daily inspection

Squareness refers to the alignment of the camera relative to the motion of the metrology stage. If the camera is misaligned (out of square), the image will drift diagonally across the screen as the stage is moved along the other axis.

Place the magnification (Mag) checker or other suitable inspection part on the stage and secure properly.

Select the crosshair image tool in software and verify that it is at its defined center position. Refer to the MetLogix M3 Video and FOV Inspection Software User’s Guide for detailed information.

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.

Zoom to high magnification, then refocus and recenter the point as needed.

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.

Report any observed discrepancy. If the error is verified, contact your Starrett representative for authorized service.

Sign off on the squareness check

Parfocality is the condition in which the video image remains in focus as the magnification is adjusted from highest to lowest. Starrett zoom optics are designed to maintain parfocality throughout their magnification range.

To check parfocality, always reference a flat, sharp edge. Do not select a rough or sloping feature. The magnification (Mag) checker provided with the system is an ideal part to check parfocality.

Place the MAG checker or other suitable inspection part on the stage and secure properly.

Backlight the image as necessary. Set light levels as needed to avoid blooming.

At low magnification, select a flat, sharp edge in the center of the field of view (FOV).

Select highest magnification, and carefully refocus the image by physically changing the viewing distance.

While observing the feature, slowly adjust the magnification lower. Verify that the feature remains focused as the magnification is lowered.

Report any observed discrepancy.

If the error is verified, contact your Starrett representative for authorized service.

• To the degree possible, the system should be kept in a clean environment, away from dirt, dust, oil, and debris which could affect system performance or degrade the system’s mechanical and electronic parts. If a clean environment is not available, the machine should be kept as clean and protected as is possible. In harsh environments, preventive maintenance and factory service should be scheduled more frequently to keep the system in top working order.

WARNING! Never pour fluid on the system when cleaning. Do not over-wet cleaning cloth. Excessive moisture can seep into mechanical or electrical parts, damage the equipment and possibly cause an electrical short circuit and physical injury. As a precaution, unplug the system before cleaning. Always unplug the system before using any flammable cleaning fluid.

• Wipe down with a clean, lint-free cloth moistened (not wet) with plain water, ammonia-free glass cleaner, or isopropyl alcohol. Never wipe down with acetone or other harsh solvents, which can damage painted or plastic surfaces.

CAUTION! Do not touch lens surfaces with your fingertips. Fingerprints can destroy optical coatings over time. Only clean optical surfaces with proper cleaning supplies, and then only when necessary.

To clean the lens, refer to the following guidelines:

• If a lens is covered with loose dust, do the following:

• Use a can of optical grade (oil-free) canned compressed air to blow off the dust. Be careful not to shake the lens, or propellant can blow onto the lens.