Determining The Height Of Instrument (Hi) - Spectra Precision LL300S Guia Del Usuario

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.
Set up the laser and place the grade rod on a job-site benchmark (BM) or known elevation.
Slide the receiver up/down the grade rod until it shows an on-grade reading.
Add the grade-rod reading to the benchmark to determine the height of instrument.
Example:
Benchmark = 30.55 m (100.23 ft)
Rod reading = +1.32 m (+4.34 ft)
Height of instrument = 31.87 m (104.57 ft)
Use this HI as a reference for all other elevations.
Vertical Application
Level the tripod and allow the laser to level in automatic self-leveling mode.
Push the manual mode button and change the laser's position on the tripod for vertical alignment by using
the vertical mounting thread.
Rotate the laser until the vertical laser plane aligns with the receiver's on-grade position.
In order to avoid offset errors, the receiver should be used close to the elevation where the laser has been
set up.
If a remote control is available, the left and right arrow buttons can be used for fine adjustments.