143
4. Adjust the four adjusting screws of the optical plummet with an adjusting pin until the center mark
coincides with Point O.
5. Repeat the inspection and adjusting steps to make the instrument meets the requirements.
6. Replace the protective cover.
12.8 INSTRUMENT CONSTANT (K)
Instrument constant has been checked up and adjusted in the factory, K=0. It seldom changes and it is
suggested to check one or two times every year. The inspection should be made on the base line, also can
be made according to the following method.
Check
1. Mount and level the instrument on Point A at a plain field. Use the vertical hair to mark Point B and Point
C with the distance of 50m on the same line, and set the reflector accurately.
2. After setting temperature and air pressure, measure the horizontal distance of AB and AC accurately.
3. Set the instrument on Point B and center it accurately, measure the Horizontal Distance of BC accurately.
4. Then the Instrument Constant can be obtained:
K
＝
AC
－
(AB
＋
BC)
K should be near to 0, If
｜
K
｜＞
5mm, the instrument should be strictly inspected in the standard baseline
site, and adjusted according to the inspection value.
Adjust
If a strict inspection proves that the Instrument Constant K has changed and is not close to 0. If the operator
wants to adjust, should set Stadia Constant according to the Constant K
●
Set the orientation via the Vertical Hair to maintain Point A, B, C on the same line precisely. There must
be a fixed and clear centering mark on the ground of Point B
●
Whether the prism center of Point B coincides with the Instrument Center is a significant step to inspect
the accuracy. So on Point B the tripod or compatible tribrach should be used. It will decrease the difference.
Input Instrument Constant:
STEP
OPERATION
DISPLAY
a.
In Adjustments menu press “3. Inst.
Constant”
.
[3]
Adjustments
1.VO Adjustments
2.Collimation
3.Inst.Constant
4.VADJ Set
