Pentax ETH-310, ETH-302, ETH-305 instruction manual Centering with the optical plummet

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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.

1Focus the optical plummet reticule by rotating the optical plummet eyepiece knob.

2Focus the station point by rotating the optical plummet focusing knob.

3Loosen 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)

4Tighten 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 4 , 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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Contents Electronic Theodolites Page Distinctive Displays Safety Precautions must be followedPage Contents Contents Storing and environmental conditions PrecautionsBattery GeneralTransportation Inspection, Adjustment and Repair, OverhaulOthers Standard EquipmentUnpacking and Storing Names of Parts Page Confirm the correct work by pressing the power switch Preparation of PowerDisplay Key Operations and DisplayKeyboard Function of each key Power ON/OFF key2 V/% key Page Hold key 4 0SET key Illumination key 5 R/L keyAutomatic Power-off function Remaining battery indicatorOther Functions Special key operations Page Setting of Vertical Angle Setting of correction of vertical angle Setting of 90buzzerSetting of angle measurement Setting of Angle unit Setting of automatic power off functionPreparation for Surveying Setting up the instrumentLeveling with the Circular level Leveling with the Plate level Centering with the optical plummet Eyepiece adjustment Object sighting Horizontal angle measurement right MeasurementHorizontal angle measurement left Vertical angle measurement Inspection Inspection and AdjustmentInstructions on inspection and adjustment Perpendicularity of plate vial to vertical axisAdjustment Perpendicularity of circular vial to vertical axis Inclination of reticule graduations Perpendicularity of line of sight to horizontal axis Difference of the vertical angle Optical plummet Diagonal Eyepiece SB14 Optional AccessoriesVertical Angle Compensation SpecificationsTelescope Angle MeasurementVertical axis Power sourceWater resistant Ambient temperature DimensionsPage Certified