Spectra Precison GL1425C - Determining the Height of Instrument (HI)

26
Scroll to >>SENS-Firmware<< and press E button (j) to read out the SENS-Firmware
revision.
Scroll to >>RADIO-Firmware<< and press E button (j) to read out the RADIO-Firmware
revision.
Scroll to >>Serial Number<< and press E button (j) to read out the internal serial
number of the laser in HEX code (see pic 81).
In menu >>Runtime<<, press E button (j) to enter the menu and to see the current
runtime of the laser.
In menu >>Radio<< press E button (j) to enter the menu and to read the laser IP-
address and the current used radio channel.
19 Determining the Height of Instrument (HI)
WHY: For most applications it is necessary that the height of instrument (HI) is known
because it is used as a reference height and control elevation on a regular basis.
WHAT: The height of instrument (HI) is the elevation of the laser beam in relation to a
benchmark or reference point. The HI is determined by adding the grade-rod reading
to a benchmark or known elevation.
HOW: Set up the laser and place the grade-rod on a jobsite benchmark (BM) or known
elevation. Slide the receiver up or 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 = 30.55m (100.23ft)
Rod reading = +1.32m (4.34ft)
Height of instrument = 31.87m (104.57ft)
Use this HI as a reference for all other elevations.
See pic 26 for a calculation example.
LL300
Height of Instrument (HI)
Rod Reading
1.32 m (4.34 ft)
Benchmark
30.55 m (100.23 ft)
HI = Rod Reading + Benchmark
HI = 1,32 m + 30,55 m = 31,87 m (4.34 ft + 100.23 ft = 104.57 ft)
HI
Pic 26 Height of Instrument Example