The 1145-2 Laser Transmitter has two horizontal level adjust screws by the windows on upper frame of unit.
These screws permit you to make minor adjustments along two axes of the horizontal plane. Axes are labeled
"X" and "Y" and rubber caps over adjustment screws tell you which axis is which.
All calibration procedures are done at zero reading on right-hand white counter wheel not against
mechanical stop if past zero point. The following items are required to make a calibration
adjustment on 1145-2 Laser Transmitter:
A 5/32-in. (0.40 cm) Allen head driver.
Model 1275 Laser Receiver.
Elevating Base and Tripod allows you to rotate 1145-2 Laser Transmitter in 90-degree
A minimum 200-ft (60.96 m) range that is unobstructed and as close to flat as possible.
Mount unit on tripod at one end of 200 ft (60.96 m) range and rough level it within +5 degrees. Set
"X" and "Y" axis grade counters at zero reading (not against counter wheel mechanical stop).
Turn 1145-2 Laser Transmitter control switch to AUTO position and wait for Auto Mode Indicator
Lamp to stop flashing.
Station a rodman with one of the suitable detectors at other end of range, 200 ft (60.96 m) away.
The appropriate axis may be identified by checking triangular markings of the "X" axis
Align laser, using sighting scope or groove, such that "X" axis is pointed directly at rodman. Ensure
pentamirror is rotating and Auto Mode Indicator Lamp has stopped flashing.
Have rodman take a precise reading to within 1/16 in. (0.16 cm) and mark reading as X1.
Rotate transmitter 180 degrees and wait at least 2 minutes for it to relevel. Have rodman take
another accurate reading and mark reading as X2.