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27.EXPLANATIONS
The 0 index of the vertical circle of your OS is almost 100% accurate, but when it is necessary to
perform particularly high precision angle measurements, you can eliminate any inaccuracy of the 0
index as follows.
• If the power is cut off, the vertical circle indexing is ineffective. Do it again every time the power is
turned on.
PROCEDURE
1. Select “Obs.condition” in <Configuration>. Set “V
manual” (vertical circle indexing method) to “Yes”.
"20.1 Observation Conditions"
<V manual 0 set> is displayed.
2. Carefully level the instrument.
3. Accurately sight a clear target with a distance of
about 30m in the horizontal direction with the
telescope in Face 1.
Press [OK]. The vertical angle V2 is displayed
under "Take F2".
4. Turn the upper part through 180° and clamp it.
Then set the telescope in the Face 2 position and
accurately sight the same target.
Press [OK].
The vertical and horizontal angles are displayed.
This concludes the vertical circle indexing
procedure.
27.1 Manually Indexing the Vertical Circle by Face 1/2
Measurement
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