Calibration 9
DG711 and DG511 Pipe Laser User Guide 77
12 Subtract the A1 and B1
elevation readings from A2 and B2
elevation readings.
Note – Your laser is in calibration
if the difference between A2 – A1
equals B2 – B1.
Note – If A2 – A1 is greater than
B2 – B1, the laser beam is shooting
high and you should readjust the
laser’s calibration bringing the
beam to level.
Note – If A2 – A1 is less than B2 –
B1, the laser beam is shooting low
and you should readjust the laser’s
calibration bringing the beam to
level.
Note – If the error is greater than
6.4 mm/30 m (0.02 ft in 100 ft),
return the pipe laser to an
authorized Trimble service center.
Adjusting the Calibration 9.2
The goal to adjusting the pipe
laser’s calibration is to make the
beam level, half the distance of the
total error. This will be the true
calibration point of the unit.
1Enter the Calibration feature
option by simultaneously pressing
the power, decrease, and
backlight/lock buttons (buttons 1,
4, 6).
2Press the backlighting/lock
button to enter the selection.
Note – To change the displayed
calibration constants when you are
in the Level Cal. mode, use the left-
or right-line control button
Note – For every 10 digits
changed, the beam’s elevation
changes 1.6 mm/30 m (1/16 inch
per 100 ft).
Note – The maximum adjustable
range is ±120 digits or ±19 mm/30
m (±3/4 inch per 100 ft ).
3When the pipe laser is
calibrated, press the backlight/lock
button to set the calibration.
Note – The laser beam will move to
the new calibration point AFTER
the calibration option is exited and
the normal grade display returns.
The laser will NOT move during
calibration. Verify that the
calibration is correct AFTER
exiting the calibration menu.