Johnson Theodolites 40-6936 Manual De Instrucciones página 29

8863H-All_Manuals 3/19/15 3:25 PM Page 29
Calibrating
• Remove the reticle cover between the eyepiece
of the telescope and the focusing handwheel.
• Set up point D between point B and C. The
distance of DC should be a quarter of BC.
Adjust the two adjusting screws to move the
reticle to have its cross aim at point D.
• Repeat above inspection steps until B and C are coincident.
• Assemble the reticle cover back to its original position.
• Loosen one screw if the vertical hair of the crosshair should be
moved, then tighten the adjusting screw on the other side about
the same number of turns. Loosen the screw counterclockwise
and tighten in the clockwise direction. The turn should be as little
as possible for both loosening and tightening.
• After above calibration, the zero reset of the upright angle should
be carried out, to reset the zero point of the upright angle.
Automatic Compensation of the Vertical Axis Incline
The instrument is equipped with the electronic incline sensor device (tilt
sensor), which can automatically compensate the vertical axis incline.
Checking
• After mounting and leveling the instrument, position the direction
of the telescope with a line between the center of the instrument
and any of its foot screws. Then tighten the horizontal braking
handwheel.
©2015 Johnson Level & Tool - Rev. 1 29