Explanation; Manually Indexing The Vertical Circle By Face Left; Face Right Measurement - Sokkia 130R Series Operator's Manual

34. EXPLANATION

34.1 Manually Indexing the Vertical Circle by Face
Left, Face Right Measurement
The 0 index of the vertical circle of your SET 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 Config
mode. Set "V manual" (vertical
circle indexing method) to "Yes."
2. Go to the Meas mode screen.
The vertical angle V1 is displayed
under "Take F1."
3. Carefully level the instrument.
4. Accurately sight a clear target with
a distance of about 30m in the
horizontal direction with the
telescope in face left.
Press [OK]. The vertical angle V2
is displayed under "Take F2."
5. Turn the upper part through 180°
and clamp it. Then set the
telescope in the face right position
and accurately sight the same
target.
Press [OK].
The vertical and horizontal angles
are displayed.
This concludes the vertical circle
indexing procedure.
170
Manually indexing the vertical circle