Troubleshooting Measurements - GE Mentor Visual iQ User Manual

Troubleshooting Measurements

Inaccurate 3D Phase or Stereo Measurements
• Move the probe tip as close as possible to the target, maximizing magnification.
• After capturing an image, verify that the tip attached to the probe matches the tip that is selected in the software.
Note: The user-input tip serial number appears in the measurement screen's corner.
• Verify that you have selected the correct type of measurement for the probe installed.
• Verify that the optical tip is threaded on to the probe head securely.
• Measure the target contained in the verification block to ensure that no tip damage has occurred.
Inaccurate 3D Phase Measurements
• Be sure to hold the probe still for approximately one second during the surface scan. Do not move the probe until after the Processing message appears on-screen.
• Reposition the probe tip until the range finder bar pattern on the Live screen shows the maximum possible number of green bars. It is acceptable to be slightly out of focus
for very small indications.
• Make sure all measurement-tip surfaces are clean. Wipe with a clean cloth and alcohol.
• Try a non-perpendicular view, such as 30-45°. This often significantly decreases the noise level in the data, especially for surfaces that are shiny or have a speckled appearance.
• Check with verification block. Check point cloud view for excessive waviness or ripple, which would indicate dirt or oil contamination or tip damage
Inaccurate Stereo Measurements
• Avoid placing cursors in areas of significant glare. If necessary, adjust the brightness or reposition the probe tip to enhance details and reduce glare.
• Verify that the object to be measured is near the center of the screen.
• Verify that the matching cursor is correct within 1 pixel. If you cannot clearly see where the match point should be, select a different point, or capture the image from a different
angle that better reveals details to allow better matching.
• Activate the zoom window to most accurately place the measurement cursors.
• Review guidelines under Achieving a Suitable Image for Making Stereo Measurements
07/30/2014
Click here to learn more about managing probe tips.
Click here to learn more about Verifying Measurement Tips.
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