77
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, with point
O being the intersection name of the two lines.
4.
Use the calibration needle to adjust the four calibration screws and to make
the center mark of the plummet coincide with point O.
Cross center on the ground
A
0
C
B
5.
Repeat step 4, check and calibrate until it meets the requirements.
6.
With the laser plummet, unbolt the laser cover using 1 hex wrench to adjust
the three screws, fasten one side and loosen the other side and adjust the
laser flare to point O.
7.
Put the cover back in place.
11.8.
Addictive constant (K)
The instrument constant is inspected when it’s out and corrected inside the
machine with a value K = 0. The instrument constant rarely changes but we suggest that
it should be checked at least once or twice a year. The checkout should be done in the
standard baseline or you can take the following simple method.
Checkout
1.
Choose a flat field A to set up and level the instrument. Mark three points A
、
B
、
C in the same line with an interval of 50m and set up the reflection prism
accurately.
2.
After setting the temperature and atmospheric pressure of the instrument,
measure the horizontal distance of ‘A B’ and ‘ AC’ accurately.
3.
Place the instrument at point B centering it accurately to measure the
horizontal distance of BC precisely.
4.
Obtain the distance measurement constant of the instrument: K= AC-
(AB+BC)
K should be close to zero. If | K | > 5 mm, it should be sent to standard baseline
field for strict checking. Calibrate it based on the checking value.
Summary of Contents for Total Station ATS-120 Series
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