Control Methods
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2-21
Figure 2-22. Sonic Tracker Scanning Outside of Stringline
If the Tracker sees an obstruction closer than the reference
signal, such as a grade pin, the watch stops at an even
shorter time (Figure 2-23). The Tracker is out of the
Working Window, and no on-grade correction signals are
applied.
Figure 2-23. Obstructions within the Sonic Tracker’s Working Window
S
on
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racker
II
S
onic
T
racker
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On
Grade
S
onic
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racker
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On
Grade
STOPWATCH
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on
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racker
II
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