Calibration; Checking Calibration Of The Y- And X-Axes; Checking Calibration Of The Z-(Vertical) Axis; Protecting The Unit - Spectra GL422 Mode D'emploi

CALIBRATION

Checking Calibration of the Y- and X-Axes

1. Set up the laser 30 m (100 ft) from a wall and allow it to level.
2. Set the grade to 0.000% in both axes.
3. Raise/lower the receiver until you get an on-grade reading for the
+Y axis. Using the on-grade marking notch as a reference, make
a mark on the wall.
Note: For increased precision, use the fine-sensitivity
setting (1.5 mm/ 1/16 in.) on the receiver.
4. Rotate the laser 180° (-Y axis toward the wall) and allow the laser
to re-level.
5. Raise/lower the receiver until you get an on-grade reading for the
–Y/axis. Using the on-grade marking notch as a reference, make
a mark on the wall.
6. Measure the difference between the two marks. If they differ
more than 3 mm at 30 m (1/8 inch at 100 feet), the laser needs
calibrating.
7. After checking the Y-axis, rotate the laser 90°. Repeat the above
starting with the + X axis facing the wall.

Checking Calibration of the Z-(vertical) Axis

To check vertical calibration, you need a plumb bob with at least 10m (30ft) of string.
1. Suspend the plumb bob in front of a house i.e., attached to a window frame whose window height is at least
10m (30ft).
2. Set up the laser in vertical so that the laser beam strikes the receiver's on-grade position at the top of the
string.
3. Look for any deviation using the receiver from the top of the string to the bottom of it. If the deviation is
more than 1mm (<1/16 in.), the vertical axis needs calibrating.
Note: If calibration is required, please, refer to the calibration instructions on our Trimble website
www.trimble.com/support.shtml.

PROTECTING THE UNIT

Do not expose the unit to extreme temperatures or temperature changes (do not leave inside the car).
The unit is very robust and can resist damage if dropped even from tripod height. Before continuing your work,
always check the leveling accuracy. See Checking Calibration section.
The laser is water proof and can be used indoors and outdoors.

CLEANING AND MAINTENANCE

Dirt and water on the glass parts of laser or prism will influence beam quality and operating range
considerably.
Clean with cotton swabs.
Remove dirt on the housing with a lint-free, warm, wet and smooth cloth. Do not use harsh cleansers or
solvents.
Allow the unit to air dry after cleaning it.
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Y+
Y
1
30 m (100 ft)
-
Y
Y
2
30 m (100 ft)
x +
30 m (100 ft)
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