Johnson Level & Tool Mfg. 40-6510 - Manual (Page 16)

16 ©2007 Johnson Level & Tool
(c) Using the clamp holder
1. grade rod clamp bolt
2. detector connection screw
• Attach the detector on the clamp
holder by the detector connection
screw.
• Attach the grade rod clamp to the
grade rod or other types of surveying
rods by tightening the clamp bolt on
the grade rod clamp holder.
(d) Detection
1. Coarse detection
• Aim the receiving window at the
rotating laser instrument. Loosen the
clamp bolt and move the detector up
and down to receive the laser
signals transmitted by the rotating
laser instrument.
• When the instrument displays like
Fig. (A), move the instrument down
as indicated by the arrow. When it
displays like Fig. (B), move it up as
indicated by the arrow.
• When Fig. (C) is displayed, the detector is level with the laser beam.