89
5. The following steps see reference in 9.6.1.
Note: Repeat the checkout steps to retest the index error
again (i Angle). If the index error still can not 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
1. 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 handwheel.
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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