Topcon Motorgrader, Operator'S Manual

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Operation
Motorgrader System Five Operator’s Manual
2-28
When setting up the Tracker over a grade reference, the size of the
Sonic Cone or the "footprint" needs to be considered. As an example,
at about 2 feet from the tracker, you will have a footprint or cone of
about 6 inches. As the Tracker is positioned closer to the grade
reference the working footprint decreases in size. As the Tracker is
moving farther away from the grade reference the sonic footprint or
cone will increase in size.
Figure 2-35.
Sonic Tracker II
T
2.0'
6.0"
SONIC "FOOTPRINT"