SHANGHAI ESURVEY GNSS CO., LTD.
40
2. Enter angle measurement after powering on the instrument.
3. Aim at the first target A, and press
0SET
twice to set the horizontal reading of target A as
0°00'00".
4. Aim at the second target B. The horizontal angle to target B shows (HA1).
5. Rotate the instrument 180°.
6. Repeat step
3
-
4
. The horizontal angle to target B shows again (HA2).
7. Calculate the collimation error:
C = (HA1 - HA2 ± 180°) / 2
8. Judge if the error is within the allowable range:
o
If it is less than or equal to 8'', no adjustment is required.
o
If it is greater than 8'', proceed to step
9
-
11
.
9. Rotate the instrument in the right position, and make the reading is HA2' = HA2 + C.
10. Remove the eyepiece cover to adjust the two horizontal adjusting screws until the reticle
coincides with the reticle of collimator or the target:
11. Repeat the whole process of checking and adjusting the collimation error until the error is
less than or equal to 8''.
