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11.2 Circular Level
Check
After the level tube is calibrated correct, if the circular level
bubble also in center, so there is no need to calibrate.
Calibration
If the bubbles is not in the center, use the correction needle
or six angle wrench to adjust the correction screw which under
the bubble to make the bubble to the center. For calibration, you
shall first loosen the calibration screw (1 or 2) which opposite to
the direction of the bubble offset, then tighten the other
correction screw in the offset direction to make the bubble in the
center. When the bubble is in center, make sure the fastening
force of the
Three calibration screws are consistent.
11.3 Reticle of the telescope
Check
1. Aim at a target A from the telescope after leveling the
instrument the cross wire on the reticle. Lock the instrument
with vertical and horizontal locking knob after aiming at A.
2. Rotate the vertical slow motion knob, move A point to
the edge of the field of view (A 'points);
If point “A” moves along the vertical line of the crosshair,
but is still in the vertical line as the left picture, the crosshair
doesn't need to calibrate. If point “A”deviate from vertical line
center, as the right picture, the crosshair is slant, so need to
calibrate the reticle;
