Explanations; Manually Indexing The Vertical Circle By Face 1/2 Measurement - Sokkia im-101 Operator's Manual

41.EXPLANATIONS

41.1 Manually Indexing the Vertical Circle by Face 1/2 Measurement

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.

"35.3 Collimation"
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 30 m
in the horizontal direction with the telescope in Face 1.
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 2 position and accurately sight the
same target.
Press [OK].
The vertical and horizontal angles are displayed.
This concludes the vertical circle indexing procedure.
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