Johnson Theodolites 40-6936 Manual De Instrucciones página 16

8863H-All_Manuals 3/19/15 3:25 PM Page 16
Conversion between horizontal angle right (HR)
and left (HL) rotation
1. Aim at a target "A" using the center of crosshair
in the telescope.
2. Press the R/L key to change horizontal angle mode
from HR to mode HL.
3. Measure in mode HL.
• The R/L button has no effect to the vertical angle.
• Press the R/L button again, and the horizontal angle is transformed
back from HL to HR again.
Holding the Horizontal Angle
Press the HOLD button to hold the horizontal angle. The reading will
blink while being held. The reading of the horizontal angle will
remain unchanged even if the direction of telescope is changed.
Press HOLD button again, the hold of horizontal angle is released.
1. Rotate the instrument to the target.
2. Press the HOLD key once to lock the value of the
horizontal angle, the reading will flash.
3. Press the HOLD key again to unlock the reading.
• The HOLD key has no effect to the vertical angle.
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