6. Self-check of accuracy
i. Self-check of level accuracy
Find a smooth wall surface without vibration,
which shall be little affected by wind. Mount this
instrument five meters away from the wall surface.
Properly install the level rotator of the instrument
and put it on the elevating tripod support. Properly
adjust the leveling.
Turn the power and the instrument will be on the
automatic leveling condition.
Turn the switch button(V/H) to position HV, then
two laser beam will display on the wall surface as a
cross curve. Assume the intersect as point A, then
use right-angle setsquare to measure if the two
lines intersect at 90 degrees.
Note down point A and point M which is 2.5
meters away from point A at the level line.
Rotate the instrument to allow another intersect-
point B, which is five meters away from point A.
Measure distance E from point M to this level line.
E shall be within ±3mm.
At this time, assume a point C on the three meters
high perpendicular laser beam.
Distance between point A and point C shall be
within ±2mm.
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When the instrument is not in used, the power
switch shall be turned OFF. Batteries shall be taken
out . Put the instrument back into its bag to avoid
unexpected damage.
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8. Attachment list
Instrument: 1 piece
Carrying bag: 1 set
Operation Instrument: 1 copy
The instrument is kind of precision instrument
which shall not be heated or drenched, extruded by
force, collided or fallen for fear of influencing its
precision.
When not use, power switch shall be pushed to OFF
position and batteries shall be taken out after the
pilot lamp goes out. Lock the pendulum mass, and
put it back into the carrying bag.
Keep the instrument clean, use clean and soft cloth
to wipe glass of transmitting windows.
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9. Maintenance
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Find a smooth wall surface without vibration, which
shall be little affected by wind. Mount this instru-
ment five meters away from the wall surface.
Use a thread plumb to determine a perpendicular
point B on the ground, which is three meters high
from point A, another head of the thread plumb.
Turn the power and the instrument will be on the
automatic leveling condition.
Properly install the level rotator of the instrument
and put it on special support. Properly adjust the
leveling.
Turn the switch button(V/H) to position HV, then
two laser beam will display on the wall surface as a
cross curve.
Coincide the perpendicular laser beam with the
perpendicular point B on the ground.
ii. Self-check of perpendicular accuracy
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7. Technical specification
Light source: Semiconductor laser instrument
Wave Length: 635nm
Laser output power: <1mw
Level accuracy: at 5m±1.5mm.
Perpendicular accuracy: at 5m±1.5mm.
Width of laser beam: at 5m±2.5mm
Length of laser beam: at 5m>10m
Self-leveling range: ±2.5°
Brake ways: mechanical ways
Operation temperature: -5°C～40°C
Power supply: two alkaline AA batteries (DV3V)
Continuous operation hours with batteries: 12 hours
(alkaline batteries)
Instrument size: length 98mm*width 60mm*height
105mm
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