SOUTH
ET
‐
02/05
ELECTRONIC
THEODOLITE
SERVICE
MANUAL
19
SOUTH
SURVEY
&
MAPPING
INSTRUMENT
CO.,
LTD.
19
2.
Circular Vial
After adjustment on the Plate Vial, circular bubble should be
centered too. If not, adjust three adjusting screws with correction
pin to make the circular bubble centered. The working principle
is that, first loosen two screws opposite with bubble deflective
direction, and then tweak tightly the third screw.
3.
Eyepiece Reticle
Rotate the telescope and aim the collimator, observe the
reticle coincide with the far crosshairs of the collimator or not.
If not, it needs to be adjusted. All the following adjustments
base on the correct collimator.
As shown in the figure, the reticle is declination. So it needs to
be adjusted.
As shown in the figure, first disassemble the Eyepiece cover, and then loosen four screws which fix the base of
reticle board, aim the crosshairs of collimator and rotate the reticle board lightly. When the reticle board
coincides with the crosshairs, tighten four screws. The adjustment completes.
4.
2C (Perpendicularity between Sight Line and Horizontal Axis)
As shown in the figure, rotate the instrument and aim the far
crosshairs at a certain horizontal line of the collimator. Note
down the value. And then tighten the horizontal clamp.
Press “0SET” twice to reset the horizontal angle.
Reverse the telescope and aim at the same position (as shown in
the figure), and tighten the tangent screw.
Note down the horizontal angle value, use the formula “HR-180°
= 2C” to calculate the value of 2C, which should be within ±8
″
.
As shown in the figure, the value of HR is 180°00’40” and the
2C error is +40” so that the instrument should be adjusted.
