2
PREPARATION
2-5. Leveling
“Leveling” refers to the precise vertical alignment of the instrument’s vertical axis.
The procedure for leveling by means of the plate level is described below.
(1) Loosen the upper plate clamp. Rotate the
alidade to position the plate level to a point
parallel with any two of the leveling screws B
and C (See Figure).
(2) Using these two screws, move the bubble to
the center of the level.
(3) Rotate the alidade approximately 90° and
again move the bubble to the center of the
level by turning the leveling screw A, as
shown in Figure.
C
B
A
2
(4) Repeat Steps (1) through (3) to center the
bubble in both positions shown by the
Figures.
(5) Furthermore, rotate the alidade 180°. If the
bubble in the plate level remains centered,
leveling is complete.
(6) If the bubble moves off center, refer to p.4-1
“CHECKING AND ADJUSTMENT of Plate
Level” and adjust the plate level.
2-10
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