Sonic Tracker II
P/N 7010-0344
2-21
The Sonic Tracker II measures the distance to a physical grader
reference by sending out sound pulses 39 times per second. As soon
as the Tracker sends out a sound wave it starts a stop watch. The
sound waves go down, bounce off of any physical reference, and are
reflected back to the Tracker. The Tracker measures the time it takes
for the sound wave to return to the Tracker. Knowing the speed of
sound, the Tracker accurately calculates the exact distance to the
grade reference. The Tracker can use any physical grade reference,
such as a stringline, curb, or existing surface.
Figure 2-28.
STOPWATCH
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