104 Chapter 7 Measuring Features and Defects GEInspection Technologies XLG3 VideoProbe System
Types of Shadow Measurement

This table specifically addresses cursor placement for each type of shadow measurement.

For the complete procedure, see “To Take a Shadow Measurement” on page 103.

Type Example Description Cursor Placement
Distance A linear (point-to-point)
measurement. Place cursors on or near the
shadow.
Skew 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.
Place cursors in the horizontal
center of the shadow.
Depth 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.
Place cursors on the raised and
recessed surfaces in the horizontal
center of each shadow.
Point to line The perpendicular distance from a
point to a line.
Place the first two cursors to define a
reference line. Place the third cursor
at the perpendicular distance you
want to measure.