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Rotate the Zone60 DG slightly until the alignment marks are aligned with your second control
point.
Once the Zone60 DG is aligned, you can start working.
3.8
Precise Alignment of the Axes
Under most conditions, the raised alignment marks on the top of the Zone60 DG are adequate
for alignment of the axes. For a more precise alignment, you can use the following procedure.
Objective of a precise alignment:
•
To establish Point A on the Y-axis as a reference and take an elevation reading.
•
To enter grade into the X-axis and then adjust the position of the laser until the original
elevation at Point A is again found.
1.
With 0.000% grade in both axes, set up the Zone60 DG directly over a grade stake
and roughly align the Y-axis to a second grade stake (Point A).
2.
Take an elevation reading at Point A using the receiver and a survey rod.
3.
Enter +5.000% grade into the X-axis. When grade is entered into the X-axis, the Y-
axis acts like a hinge or fulcrum.
Precisely aligning X- and
Y-axis
Operation
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