SLT12 User Manual
191
17.1
Tube Level
17.1.1 Check
The method is described in the book "Accurate leveling instruments with tube level".
17.1.2 Adjust
1. In the inspection, if the bubble of the tube level deviates from the center, first use the foot
spiral parallel to the tube level to adjust it, so that the bubble moves to the center nearly half
of the deviation amount. The remaining half of the bubble will be adjusted by turning the
level correction screw (on the right side of the level) with the correction needle until the
bubble is centered.
2. Rotate the instrument 180° and check whether the bubbles are centered. If the bubble is still
not centered, repeat step 1 until the bubble is centered.
3. The instrument will be rotated 90 °, with the third foot screw to adjust the bubble centered.
- Repeat the test and calibration steps until the alignment section is turned so that the bubble
is centered in any direction.
17.2 Round Level
17.2.1 Check
After the long level is checked and calibrated correctly, if the bubble of the round level is also
centered, there is no need to correct it.
17.2.2 Adjust
If the bubble is not centered, adjust the calibration screws below the bubble with a calibration
pin or hexagonal hand to center the bubble. When correcting, loosen the correction screws (1
or 2) on the opposite side of the bubble offset direction, and then tighten the remaining
correction screws on the offset direction to center the bubble. When the bubble is centered,
the tightening force of all three calibration screws should be the same.
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