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5. PREPARATION FOR MEASUREMENT
5.1 UNPACKING AND STORAGE OF INSTRUMENT
- Unpacking of instrument
Keep the case right side up with care, and open the instrument container and take out
the instrument.
- Storage of instrument
Cover the objective lens with the cap and place the instrument into the case. Make sure
the vertical clamp screw and circular vial stay upwards (Objective lens towards
tribrach), and slightly tighten the vertical clamp screw and lock the case.
5.2 INSTRUMENT SETUP
Put the instrument on the tripod. Level and center the instrument precisely.
Operation Reference:
1. Leveling and Centering the Instrument by plumb bob
1) Set up the tripod
①
Adjust the tripod legs to suitable length, make the tripod head parallel to the
ground and tighten the screws.
②
Make the center of the tripod and the occupied point approximately on the
same plumb line.
③
Set the tripod and make sure it is well stationed on the ground.
2) Put the instrument on the tripod
Put the instrument carefully on the tripod head and slide the instrument by
loosening the tripod head screw. If the plumb bob is positioned right over the center of
the point, slightly tighten the tripod head screw.
3) Roughly leveling the instrument by using the circular vial bubble.
①
Turn the leveling screw A and B to move the bubble in the circular vial, in
which case the bubble is located on a line perpendicular to a line running through the
centers of the two leveling screw being adjusted .
