Laser Axis Alignment
P/N 7010-0369 www.topconpositioning.com
3-7
The calibration error at the distance from the laser to the grade rod
is half the amount between the first and second readings.
• If the calibration error is less than .015 ft., no calibration
adjustments are necessary.
NOTICE
Laser transmitter models have different accuracy
specification. See you laser operator’s manual
for accuracy specifications for your laser.
• If a calibration error over .015 ft. has been determined, a field
adjustment can be made. See your laser’s Operator’s Manual
for calibration adjustment procedures.
Laser Axis Alignment
When setting up the laser to grade a pad or an area with slope,
correct laser alignment is critical. The laser transmitter must be
aligned so that the laser slope is parallel to the desired slope of your
project. Even slight rotation errors can cause significant error in the
elevation of the cross slope axis. The steeper the slope, the more
error you will have with an incorrectly aligned laser.
Automatic Alignment
For lasers with the automatic alignment feature (such as the RT-
5Sa), follow these steps to correctly align the laser’s axis:
1. Roughly align a laser’s grade axis to within 10° of the true
axis.
2. Position the alignment target:
• on the true axis up to 328' (100 meters) from the laser,
• so the “Up” arrow point up, and
• with the reflective side facing the laser (Figure 3-6 on
page 3-8).
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