User's Manual

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13.6 Vertical index error (angle i) and set vertical
index 0
Please first adjust finely the reticule of the telescope and the
compensator before calibrating and checking index error.
Check
1. Turn on the instrument after placing and leveling it, and
focus the telescope on a clear goals .A to get the face left reading
of vertical Angle L;
2. Turn the telescope around and aim at the same target A
and get the face right reading of vertical Angle R;
3. Assume that the zenith of the vertical angle is 0°, then
angle i= (L+R-180°)/2 or Angle i= (L+R-540°)/2;
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.
13.7 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