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6
Checking and Adjustment
Checking and Adjusting the Plate Level
The axis of the plate level vial must be at right angles to the vertical axis of the
instrument.
To check and adjust the plate level:
1.
2.
3.
4.
5.
Checking and Adjusting the Circular Level
Once you have checked and adjusted the plate level,
check the circular level.
If the bubble is not in the center of the level, use the
adjusting pin to rotate the three adjustment screws
until the bubble is centered.
14 6
Field Station NPL-632 Instruction Manual
Set up the instrument on the tripod.
Follow the leveling procedures described in
Rotate the alidade 180°.
Check whether the bubble is in the center of the vial.
If the bubble is not in the center of the vial, adjust the plate level:
a.
Using the adjusting pin supplied, rotate
the plate level's adjustment screw until
the bubble has moved half of the
distance back to the center.
b.
Using leveling screw A, move the
bubble into the center of the vial.
c.
Repeat from
Step
4.
Leveling, page
17.
A
B
2
C
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