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11.2 Circular Level
Check
If the bubble of the circular level is centralized after
adjusting the tubular level, then it is not necessary to adjust the
circular one again.
Calibration
If the bubble is not centralized, adjust the correction
screws under the bubble with a correction needle or a hexagon
spanner until it is centralized. When calibration, please first
screw off the 1 or 2 screws opposite to the direction which the
bubble shifts to. Then screw up the correction screws at which
bubble shifts to centralize the bubble. As the bubble is
centralized, the three correction screw should be the same tight.
11.3 Reticule of the telescope
Check
1. Aim at a target A from the telescope after leveling the
instrument with the help of the cross wire on the reticule. Lock
the instrument with vertical and horizontal locking screw after
aiming at A.
2. Shift the image of A to the margin of the reticule with
the help of vertical inching screw.
3. If the image of A shifts all the way down to the margin
along the wire, then there is no need to calibrate the cross wire