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15. CHECK AND ADJUSTMENT
This instrument has undergone a strict process of checking and adjustment, which
ensures that it meets quality requirement. However, after long periods of transport or
under a changing environment, there may be some influences on the internal structure.
Therefore, before the instrument is used for the first time, or before precise surveys,
user should launch check and adjustment introduced in this chapter to ensure the
precision of the job.
15.1 PLATE VIAL
Check
Please refer to Chapter 3.2 “Leveling by Using Plate Vial”
Adjust
1. Adjust leveling screws, make plate bubble centered;
2. Rotate the instrument 180°; watch the offset of plate level;
3. Tweak adjustment screws (on the right of the plate vial) with the correction pin to
make plate bubble to move half of the offset back;
4. Rotate the instrument 180°, check adjustment result;
5. Repeat the above steps until the plate level is centered in all directions.
15.2 CIRCULAR VIAL
Check:
No adjustment is required if the bubble of circular vial is in the center after
checking and adjustment of the plate vial.
Adjust
1. Adjust circular bubble after plate bubble is centered.
2. Loosen the screw (one or two) opposite with bubble deflective direction;
3. Tighten the screw on the direction accordant deflective until circular bubble is
centered;
