GE XL Vu+ VideoProbe, Operating Manual

Page: 134 / 168

Chapter 7. Maintenance
124 XL Vu+™ VideoProbe® Operating Manual
7.2 Troubleshooting Measurements
7.2.1 Inaccurate Stereo or Shadow Measurements
Take the following initial steps to correct this problem:
•
Move the probe tip as close as possible to the target, thus maximizing the
magnification.
•
Verify that the tip actually attached to the probe matches the tip information that
is selected in the software.
•
Verify that the correct type of measurement has been selected.
•
Verify that the optical tip is threaded onto the probe head securely.
•
Measure the target contained in the verification block to ensure that the tip has
not been damaged. See
“Verifying Measurement Tips” on page 137 .
Incorrect measurements can result from dirty tip optics. A tip that visually appears
clean may have a film of oil that will negatively affect measurement performance.
To clean the tip, follow the instructions in
“Cleaning Optical Tips” on page 123 .
7.2.2 Inaccurate Stereo Measurements
Take the following initial steps to correct this problem:
•
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 it is not clearly
visible 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.
•
Use shadow measurement instead, if there is little detail in the measurement
area or measurement is needed along smooth, straight lines.
•
Review the guidelines in “Positioning the Probe Tip for Maximum Accuracy”
on page 100 .