Setting Grade Reference Points
P/N 7010-0369 www.topconpositioning.com
3-15
Once you have determined the errors and given points on the field,
compensate for error due to drift or atmospheric conditions:
• Use elevation offsets in the Control Box to set an elevation for
different areas of the field. See “Elevation Offset Button and
Elev/Avg Button” on page 2-7 and “Elevation Offsets
(Setpoints)” on page 2-34 for information.
• If grading throughout the night, the beam will most likely stay
in that position until early morning, or until the wind mixes the
layers of air. In this case, set the Control Box to compensate for
this error.
NOTICE
Changing grade to match one end of the field to
compensate for drift will cause double the error
on the opposite side of the laser/field.
Therefore, only change grade on one side of the
laser if working only on that side.
• If you measure transmitter drift, make an elevation adjustment
to match the reference spot or hub, then work closely to that
area. Wait for a time of day to work on other areas of the field
when the drift is minimized.
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