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27. EXPLANATIONS
The 0 index of the vertical circle of your instrument is almost 100% accurate, but when it is necessary to perform
particularly high precision vertical 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.
• If it necessary to renew the registered collimation offset constant in your instrument, perform the collimation
checking and adjusting.
PROCEDURE
1. Select “Instrument” in <Inst. config.>. Set “V
manual” (vertical circle indexing method) to “Yes”.
"19.7 Instrument Conditions - Instrument"
<V manual 0 set> is displayed.
2. Carefully level the instrument.
3. Accurately sight a clear target with a distance of
30 m or more 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.
27.2 Manually Indexing the Vertical Circle by Face 1/2 Measurement