Centering Device - Titan TTS2 Manual

4. If | i |≥10", may be you need reset the zero value of vertical
index;
5. For the following steps, see reference in chapter 11.6.1.
Note: Repeat the checkout steps to retest the index error again
(i Angle). If the index error still cannot accordance with requirements ,
it should check the three steps of calibration index zero setting (in the
course of zero setting ,the vertical angle showed is not compensated
and corrected, it is just for reference) to see whether it is incorrect,
whether the focusing of target is correct, reset according to the
requirements;
6. If the index error does not meet requirements at all, you may
have to send the instrument back to factories for checking.

11.7 Centering device

Check
Place the instrument onto the tripod and draw a cross on a white
paper, place the paper with a cross on the ground right below the
instrument;
2. Adjust the focal length of the optical plummet (for the optical
plummet) or press key[★] to switch on laser plummet, move the
white paper to make the cross in the center in the field of view (or
laser flare);
3. Turn the feet screw, make the center mark of the plummet
coincide with the cross center;
4. Rotate alidade, every turn of 90°, observe the contact ratio of
the optical plummet and cross center;
5. When rotate the alidade, the center of the optical plummet
always coincide with the cross center, there is no need to calibrate.
Otherwise you should calibrate as the following methods.
Calibration
1. Take down the screw cover between the optical plummet
eyepiece and the focusing hand-wheel;
2. Fix the white paper with a cross, and mark the points when the
instrument rotates 90°, as the figure shows A, B, C, D points;
3. Connect the diagonal points A、 C and B、 D with a straight line,
the intersection name of the two line is point O;
4. Use the calibration needle to adjust the four calibration screw,
to make the center mark of the plummet coincide with point O;
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