Hi-Target HTS-420R - Instrument Checkout and Calibration; Tube Level Checkout and Calibration

Total Station Manual
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3. Checkout and calibration
The instrument at the factory has to undergo a rigorous inspection and
correction, meeting the quality requirements. However, after long transport or
environmental change, its internal structure will be some impact. Therefore, the new
purchased instruments should be checked and calibrated before surveying to ensure
the precision.
3.1 Tube level
 Checkout
Refer to the chapter "Leveling instrument accurately by tubelevel"of" Setting up
theinstrument”
 Calibration
1. In the calibration, if the leveling bulbs diverge from the center, use the foot
spiral which parallels the leveling tube to adjust to make the bubble move half
of the distance to the center. For the remaining, use the calibration needle to
turn the level calibration screw (in the right of the water-level) to adjust the
bubble to the center.
2. Turn the instrument for 180 °, check that whether the bubble is in the center. If
the bubble is not centered, repeat Step (1) until the bubble to the center.
3. Turn the instrument for 90°, use the third foot screw to adjust the bubble to
the center.
 Repeat the Steps of checkout and calibration until the bubble in the center in
every direction.
3.2 Circular level
 Checkout
After the level tube calibrated correct, if the circular level bubble also in the
center, so there is no need to calibrate
 Calibration