GE Everest XLG3 VideoProbe Operating Manual page 116

108 Chapter 7 Measuring Features and Defects
Types of Shadow Measurement
This table specifically addresses cursor placement for each type of shadow measurement.
For the complete procedure, see
Type Example
Distance
Skew
Depth
Point to line
"To Take a Shadow Measurement"
Description
A linear (point-to-point)
measurement.
A linear (point-to-point)
measurement on a surface that is
not perpendicular to the probe view.
Take a skew measurement only if
you cannot obtain a vertical shadow.
The perpendicular distance between
a surface and a point above or below
it. Used to evaluate changes due to
wear, misalignment, and other
causes.
The shadow is further left on the
surface that is closer to the probe tip.
The perpendicular distance from a
point to a line.
GE Inspection Technologies XLG3 VideoProbe System
on page 107.
Cursor Placement
Place cursors on or near the
shadow.
Place cursors in the horizontal
center of the shadow.
Place cursors on the raised and
recessed surfaces in the horizontal
center of each shadow.
Place the first two cursors to define a
reference line. Place the third cursor
at the perpendicular distance you
want to measure.