Paving Principles & Control Methods
Topcon Paver System Five Operator’s Manual
2-20
If the screed and Sonic Tracker II are lowered, the watch
stops at a shorter time (Figure 2-21). The Tracker and
Control Box indicate a raise correction arrow, and raise
hydraulic valve corrections are applied to bring the Tracker
back to on-grade.
Figure 2-21. Sonic Tracker Below Grade
If the Sonic Tracker II is side shifted off a stringline, the sound
waves reflect off the ground and the Tracker's stopwatch
indicate a longer time (Figure 2-22 on page 2-21). The Tracker
is out of the Working Window, and no on-grade corrections are
applied.
S
onic
T
rac
ker
II
S
onic
T
racker
II
STOPWATCH
On
Grade
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