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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
