Instruction manual

151

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”.

C"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 left.

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 right 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 Left, Face

Right Measurement