18 • LMH Series Rotary Lasers
Fig. 9
Y+
Y-
X+X-
100'
(30m)
A
B
ANTI-DRIFT
SYSTEM
POWER
MANUAL
Automatic Self-Leveling
Rotary Laser
LMH
Fig. 10
6. LMH SERIES CALIBRATION
Your LaserMark
®
level is a sealed unit and is
calibrated to precise accuracies at the factory.
However, a calibration check is recommended
before the initial use of your laser, and then
periodically from that point forward. Be sure
to allow time (up to 30 seconds) for the unit
to completely self-level before each check.
Please note the direction of the X and Y axes
for the unit (Fig. 9). You will need to refer to
this to complete the following steps.
6.1 Upright Position Peg Test (X axis)
1: To test the X axis, mount the LaserMark
®
on a
tripod or a level, sturdy surface and place
approximately 100 feet (30m) away from a
wall. Face the left side of the unit
(X- quadrant) to the wall.
2: Press the POWER button and
allow the unit to self-level. Using
the laser detector, locate and mark
the position of the laser line on
the wall (“A”, Fig. 10).
3: Loosen the LaserMark
®
from the
tripod and rotate the instrument
180°. Ensure that the height of the
tripod does not change, as this will affect your results. Secure and
re-level the unit.
4: Again, locate and mark the position of the laser line on the wall
(“B”). No adjustment is necessary if the vertical difference between
A and B is less than
1
/
8
" (3.5mm)
Repeat the above steps to ensure a correct reading. If the distance
is greater than
1
/
8
", you will need to calibrate the X axis (next refer to
6.1.2; for LMH600, refer to 6.2.1).
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