Starrett Horizontal Digital Video System HDV300

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

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.

• 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.;

MAG checker or other suitable inspection part placed and secured on the stage

Crosshair image tool selected and verified at its defined center position

Crosshair centered on the X-Y axis of the calibration standard at low magnification

Image refocused at high magnification

Stage position adjusted to recenter the crosshair on the feature

Feature remains at the center of the crosshair as the magnification is lowered

Report any observed discrepancy

Sign off on the parcentricity 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.

MAG checker or other suitable inspection part is placed on the stage and secured properly.

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

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

At highest magnification, the image is refocused by physically changing the viewing distance.

While observing the feature, the magnification is slowly adjusted lower. 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.

Sign off on the parfocality and focus check