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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 ne-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.
111560trimble_UL633_01_GB.indd 18 23.01.12 07:11