GE XLG3 - Manual (Page 118)

User Manual Chapter 7 Measuring Features and Defects 109
Troubleshooting Inaccurate Measurements
Help: I’m Getting Inaccurate Stereo or Shadow Measurements
Move the probe tip as close as possible to the target, maximizing magnification.
Verify that the tip that is attached to the probe matches the tip information that is selected
in the software. Press
. Select Measure > Tip.
Verify that you have selected the correct type of measurement. Press . Select
Measure > Shadow or Stereo > measurement type.
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. See
“Verifying Measurement Tips” on page 108.
Help: I’m Getting 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.
Try shadow measurement instead if there is little detail in the measurement area, or if you
need to measure along smooth, straight lines.
Review guidelines under “To Position the Probe Tip for a Stereo Measurement Image” on
page 94.
Help: I’m Getting Inaccurate Shadow Measurements
Verify that the surface is perpendicular to the probe view for all but skew measurements.
Verify that the shadow is properly oriented, the vertical dashed line (if any) is centered,
and the cursors are properly placed.
Review guidelines under “To Position the Probe Tip for a Shadow Measurement Image” on
page 101.