Starrett Horizontal Digital Video System HDV400

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

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.

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.

Verify that the calculated absolute X measurement errors are within the HDV system accuracy specification, which is E2 = 3.0 µm + 1 µm x L/(33 mm).

• 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.;

Parcentricity describes the condition where a feature remains at the optical center of the video image throughout the magnification range. Like parfocality, parcentricity requires that the feature be first located at highest magnification.

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

Is the crosshair image tool at its defined center position?

Zoom to low magnification and adjust the stage position so that the crosshair is centered on the X-Y axis of the calibration standard (or another suitable feature if the standard is not used).

Change to high magnification and refocus the image.

Adjust the stage position as needed to recenter the crosshair on the feature.

Does the feature remain at the center of the crosshair as the magnification is lowered?

Report any observed discrepancy.

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

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. Light levels are set 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