TM 5-6675-348-13&P
Capabilities. The 1145-2 Laser Transmitter electronically self-levels to within +5 degrees, whenever it
b.
is rough leveled. The Early Warning System shuts off the laser beam if the laser setup is knocked out of
level and it turns back on again only after the electronic self-leveling system has releveled the laser
beam.
The 1145-2 Laser Transmitter is designed for use at distances up to 1000 ft (305 m). Beyond this distance,
curvature of the earth becomes a consideration. Error from the earth's curvature affects a 1145-2 Laser
Transmitter the way it does a surveying instrument. Elevation readings at long distances will appear lower
than they actually are. The following table shows amount of error for a straight line of sight due to curvature
of the earth.
500 ft (152 m)
0.005 ft (0.0015 m)
1000 ft (305 m)
0.02 ft (0.0060 m)
1500 ft (457 m)
0.05 ft (0.0152 m)
2000 ft (610 m)
0.08 ft (0.0244 m)
Do not look into 1145-2 Laser Transmitter for a long period of time. Failure to comply may
cause injury to personnel.
Features. The 1145-2 Laser Transmitter projects a beam of infrared laser light produced by a
c.
battery-operated diode laser. The beam of light rotates at 600 rpm and establishes a flat reference
plane over a work area. The reference plane of light can be tilted up to 9.99% grade in two axes that are
perpendicular to each other. The system electronically self-levels at any combination of grade settings
preset by the user. If the 1145-2 Laser Transmitter is disturbed, the laser beam automatically shuts off
until it has releveled. The 1145-2 Laser Transmitter, with dual axes, provides precise reference
automatically for control of compound grades on a job site.
1145-2 LASER TRANSMITTER LOCATION AND DESCRIPTION OF MAJOR COMPONENTS.
a.
1145-2 Laser Transmitter Characteristics.
The 1145-2 Laser Transmitter operating temperature range is -4 to 120 F (-20 to 49 C) and storage temper-
ature range is -40 to 140 F (-40 to 60 C).
