7
UACCURATE SETUP.
For best accuracy use the optional sighting scope
accessory. NOTE! Calibrate the scope to the instrument
before use.
UCalculating percent of grade
Percent of grade is the change in elevation from Point A
to Point B over a 100 ft. distance. To calculate %, divide
the difference in elevation between A and B by the
distance and multiply by 100.
Example 1 – Positive grade:
Close point A and far point B are 300 ft. apart
Rod reading at A is 6 ft.; at B, 2 ft. Difference in
elevation: 4 ft. Divide 4 by 300 =.01333 x 100 = 1.333.
Percent of grade is + 1.333%
(B is 4 ft. higher than A, so it’s a positive grade.)
Example 2 – Negative grade:
Close point A and far point B are 120 ft. apart
Rod reading at A is 5 ft.; at B, 6 ft.
Difference in elevation: - 1 ft.
Divide –1 by 120 = -.00833 x 100 = -.833%
(B is lower than A, so it’s a negative grade.)
USelecting percent of grade -- X & Y axes
1. Turn on the laser and remote control.
Note: If the laser was used previously with a grade
entered in the Z axis, the Y axis will automatically be
at that same grade.
2. To select a grade for the X axis, press the X / Y key
(15).
The X symbol will blink on the display.
3. Use the four arrows on the multi key (10) to select
grade:
positive grade in percent (+ 1%, + 2%, etc. up to + 10%)
negative grade in percent (- 1%, - 2%, etc. up to – 10%)
positive grade in thousandths of a percent (+ .001%, etc.)
negative grade in thousandths of a percent (- .001%, etc.)
4. Press the OK key (14) to enter your selection, or
enter a second grade (Step 5). After pressing OK,
wait for laser to level to desired grade. The numbers
