Explanation; Manually Indexing The Vertical Circle By Face; Face 2 Measurement - Sokkia CX-52 Operator's Manual

36. EXPLANATION

36.1 Manually Indexing the Vertical Circle by Face 1,

Face 2 Measurement

The 0 index of the vertical circle of your CX 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. Press [OBS] on the status screen.
The electric circular level is
displayed in the screen.
3. Carefully level the instrument and
press [OK].
The vertical angle V1 is displayed
under "Take F1."
4. 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."
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Manually indexing the vertical circle
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