HEIDENHAIN IK 5494-2D - Manual (Page 116)

94 QC5200 Series User’s Guide
Farthest probe
The Farthest probe uses edge detection to scan many points and
return the single point positioned farthest from the starting posi-
tion of the probe scans when the scan direction is from dark to
light. The probe scans every pixel line and the number of scans cannot be
changed in the Probe Library.
The farthest probe is typically used to determine the location of a corner
or other prominence.
NOTE
When the scan direction is from light to dark, the Nearest probe discussed on the
previous page can be used to determine the location of a prominence.
CAUTION
The point identified as farthest from the start of scan side of the probe depends on the
feature geometry and the probe orientation. Be careful to orient the probe so that the
prominence being measured seems visually farthest from the start of scan side of the
probe before firing the probe.
Select the probe from the Probe menu, live video window on-screen menu or the VED toolbar. Move the
probe, change its size or change its orientation as described earlier in this chapter.
To acquire the farthest point, select and position the probe over a prominence
then click the center mouse button to fire the probe.
The farthest probe can be obtained from a collection of six probes by click-
ing on the probe icon. Repeatedly clicking the probe icon cycles through the
six probes shown in this diagram.
Measurement results are sent to the Features template and the Results win-
dow. Point measurement results include:
• The feature type and feature number
• The number of points acquired and the
number of points used to calculate
feature data
• The geometric center location of the feature
• The form value
The location farthest from the
start of scan is returned as a
single point
Farthest point
Start of scan