Spectra LL500 Reference guide

Features and Functions
1. Power Switch—turns the laser on/off.
2. Handle—allows you to carry the
laser easily.
3. Battery Housing—holds four D-cell
alkaline or Ni-Cd batteries.
4. Battery-Recharging Jack—is the
port that an optional battery recharger
plugs into.
5. Low-Battery LED—flashes when the
batteries need replacing or recharging.
6. Rotating Prism—spins at 600 rpm to
transmit the laser signal.
7. Bull’s-Eye Level—provides an easy
reference for leveling the laser.
8. Leveling Screws—turn clockwise/
counterclockwise so the laser can
be leveled.
09. Leveling Base—supports the laser while
it’s on the tripod. The leveling base also
allows you to use the laser freestanding.
10. Lighthouse—is a 360° exit window for
the laser beam. The lighthouse is sealed
and protects the internal components
from the environment.
11. Out-of-Level LED—flashes when the
laser is out of its self-leveling range.
12. X Axis Calibration Screw—allows the
X axis of the laser to be adjusted so that
the laser beam is level.
13. Y Axis Calibration Screw—allows the
Y axis of the laser to be adjusted so that
the laser beam is level.
14. 5/8-11 Tripod Mount—allows the laser
to be attached to a standard 5/8-11
construction tripod.
Model LL500
Quick Reference Card
2
1
9
3
4
8
11
6
5
7
10
12
13
14

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 and level the laser.
2. Attach the receiver to a grade rod and turn on the receiver.
3. Place the grade rod on a job-site benchmark (BM) or known elevation.
4. Slide the receiver up/down the grade rod until the LCD shows an on-grade reading.
5. Add the grade-rod reading to the benchmark to determine the height of instrument.
Example: Benchmark elevation = 100.23 ft (30.55 m)
On-grade rod reading = + 4.34 ft (1.32 m)
Height of instrument = 104.57 ft (31.87 m)
6. Use this HI as a reference for all other elevations.
© Trimble Engineering and Construction Division, 5475 Kellenburger Road, Dayton, Ohio 45424-1099, [phone], FAX: [phone]
www.Trimble.com Reorder No. 1044-0930 02/02
N324
HI
Rod Reading
4.34 ft (1.32 m)
Benchmark
100.23 ft (30.55 m)
HI = Rod Reading + Benchmark
HI = 4.34 ft + 100.23 ft = 104.57 ft (1.32 m + 30.55 m = 31.87 m)
Height of Instrument (HI)