Pentax ETH-310 Bedienungsanleitung PDF herunterladen (Seite 31)

4.4 Centering with the optical plummet

After [4.3 Leveling with the plate vials] is completed, the instrument must

be centered above the station point.

Focus the optical plummet reticule by rotating the optical plummet

eyepiece knob.

Focus the station point by rotating the optical plummet focusing knob.

Loosen the tripod center screw. Look through the optical plummet

eyepiece, and move the instrument bottom plate until the reticule

center coincides with the station point. (Take care not to rotate

the instrument)

Tighten the tripod center screw. Ascertain that the bubble stays

positioned in the center when rotating the plate vial position in steps

of 90°. If the bubble is not positioned in the center, adjust with the

leveling screws. (Refer to [4.3 Leveling with the plate vial]).

Even if the bubble is shifted by one graduation in , deviation of

centering is just 0.3mm, at the instrument height of 1.4m, giving little

effect on the survey result.

Center mark

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Pentax ETH-310 Bedienungsanleitung Seite 31