Applications; General Construction; Determining The Height Of Instrument (Hi); Using The Slope Mode - Spectra GL422 Mode D'emploi

APPLICATIONS

General Construction

Determining the Height of Instrument (HI)

The height of instrument (HI) is the elevation of
the laser's beam.
The HI is determined by adding the grade-rod
reading to a benchmark or known elevation.
1. Set up the laser and place the grade rod on a
job-site benchmark (BM) or known elevation.
2. Slide the receiver up/down the grade rod until
it shows an on-grade reading.
3. Add the grade-rod reading to the benchmark to
determine the height of instrument.
Example:
Benchmark
Rod reading
Height of instrument
Use this HI as a reference for all other elevations.

Using the Slope Mode

1. Set up the laser over the reference point (A).
2. Use the sighting guides on the top of the laser to align the laser
to the desired direction hub. Turn the laser on the tripod until it is
properly aligned.
3. Attach a receiver to a grade rod. Set the grade rod on the direction
hub (B) with the grade value 0% on both axes to check the laser's
elevation.
Note: Use this HI as a reference for checking the alignment
of the laser after setting the slope.
4. Dial in a slope for the cross (y) axis by pressing the laser's or remote
control's left or right arrow button.
5. Recheck the laser's elevation using the HI in step 3 on the 0% axis at point (B).
Note: If the HI has been changed, rotate the laser on the tripod until you get an on-grade reading
again. Make sure you DON'T change the height of the receiver on the grade rod.
6. Dial in the final required grade value on one or both axes.
Note: Axis alignment over a short distance can be done by using only the sighting guides on the
sunshade which allows the user to skip points 3 to 5.
Note: After you've finished grading on one side of the road, you can reverse the sign of the y axis
using the radio remote control.
To reverse the sign of the Y (/)- or X (y)- grade, press and release the manual button quickly while in grade
change mode.

Establishing Vertical Alignment

1. Set up the laser on its side over the first reference point.
2. Position the receiver at the second reference point.
3. To adjust the laser beam for line direction, use the up and down buttons on the laser or radio remote control
until the laser beam matches the line point.
Note: To adjust the vertical laser beam different to the plumb position, press and release the manual
button and then use the left and right buttons on the laser or the radio remote control.
120686_01_GL400_GB.indd 11
= 30.55 m (100.23 ft)
= +1.32 m (+4.34 ft)
= 31.87 m (104.57 ft)
Height of Instrument (HI)
HI
HI = Rod Reading + Benchmark
HI = 1.32 m + 30.55 m = 31.87 m (4.34 ft + 100.23 ft = 104.57 ft)
Rod Reading
1.32 m (4.34 ft)
Benchmark
30.55 m (100.23 ft)
B
C L
A
C
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30.05.12 10:27