Determining The Height Of Instrument (Hi) - Spectra Precision Laser HV302 Guía De Uso

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
Set up the laser on the tripod by using the vertical mounting thread and allow the laser to level in
automatic self-leveling mode.
Push the Manual mode button and rotate the laser until the vertical laser plane aligns with the receiver's
on-grade position.
Push the manual button again to resume automatic self-leveling mode and use the Left and Right arrow
buttons for fine adjustments.
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