Starrett Horizontal Digital Video System HDV300

Calibration should be verified periodically depending on user requirements, system usage, and should be performed at least monthly.

Calibration should also be verified after the system has been serviced or moved.

A chrome-on-glass calibration verification standard artifact is available from Starrett or its authorized distributors.

This standard has a length of 300 millimeters and major calibration fiducials spaced every 25 millimeters.

To validate calibration, perform the following steps:

Place the calibrated standard along the X-axis. Secure the standard to the stage with a holder (available from Starrett).

Skew the center of the two end circles of the calibration standard. Refer to the M3 Software User Guide for proper alignment procedure.

Using the HDV system, measure the position of fiducials spaced every 25 millimeters. For each fiducial, take the average of multiple readings for improved accuracy.

Calculate the absolute measurement error for each fiducial by subtracting the calibrated position of the fiducial from the above average readings.

Inspect the fan filter. If dirty, wash or replace the filter.

Inspect the system for cleanliness. If dirty, follow cleaning instructions later in this section.

Verify that the stage control mechanisms move freely. Lubricate as needed or every six months as described later in this section.

Check the system for calibration against a chrome-on-glass standard.

Sign off on the weekly maintenance

Verify that the work area is clean, dry and free of debris.

Verify that any debris or loose items have been removed from around the system and stage.

Verify that the electrical power cord is plugged into a grounded power source and is unobstructed.

Verify that temperature is within recommended range.

Verify that humidity is within recommended range.

Allow the system to warm up to normal operating temperature before performing critical parts measurements.

Sign off on the daily inspection

• In a standard HDV configuration, the side of the housing includes a 4.7 inch (120 mm) fan that draws in ambient air through a filter and maintains a slightly positive pressure inside the housing. While the system is running, the air that comes in contact with the electronics has passed through this filter.

• Inspect the fan filter for cleanliness at least monthly. Fan filters and the fan itself are userreplaceable items. The filters and fan are available from electronics distributors and in computer stores. When purchasing a new fan, ensure that the voltage is 24V, as marked on the previous fan.

• To inspect the fan filter, refer to the following figure and perform the following steps:

1. Pry off the fan bezel with a flat-blade screwdriver and remove the filter, which is held by the bezel.

2. Inspect the fan filter. If the filter is dirty, it can be washed in hot water or be replaced.

3. To reinstall the filter, reseat it in the bezel and press the bezel back in place.;

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