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disappear to appear "Tilt over!" correspondingly , it indicate that
the dip Angle of the vertical axis is bigger than 3 ', beyond the
range of vertical plate compensator design . When rotating the
feet spiral recovery in the opposite direction, the instrument
shows vertical Angle again, if you can see the change when
testing it again and again in critical positions, it says that vertical
plate compensator works normally.
Calibration
When finding the tilt compensator abnormal, please send
the instrument back to factories for checking.
11.6 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)
