Pentax ETH-302, ETH-310, ETH-305 instruction manual Hold key

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2.3.3 [HOLD] key

1Press the [HOLD] key twice in succession to hold the displayed horizontal angle and retain it. (Press once, the key buzzer will sound, then press again during the sound.)

2Press the key once more to release.

To prevent operation error, the buzzer sounds for three seconds when the [HOLD] key is pressed.

HOLD is not initiated unless the key is pressed during the buzzer sound.

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Contents Electronic Theodolites Page Safety Precautions must be followed Distinctive DisplaysPage Contents Contents General PrecautionsBattery Storing and environmental conditionsInspection, Adjustment and Repair, Overhaul TransportationStandard Equipment OthersUnpacking and Storing Names of Parts Page Preparation of Power Confirm the correct work by pressing the power switchKey Operations and Display DisplayKeyboard Power ON/OFF key Function of each key2 V/% key Page Hold key 4 0SET key 5 R/L key Illumination keyRemaining battery indicator Automatic Power-off functionOther Functions Special key operations Page Setting of Vertical Angle Setting of 90buzzer Setting of correction of vertical angleSetting of angle measurement Setting of automatic power off function Setting of Angle unitSetting up the instrument Preparation for SurveyingLeveling with the Circular level Leveling with the Plate level Centering with the optical plummet Eyepiece adjustment Object sighting Measurement Horizontal angle measurement rightHorizontal angle measurement left Vertical angle measurement Perpendicularity of plate vial to vertical axis Inspection and AdjustmentInstructions on inspection and adjustment InspectionAdjustment 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 Optional Accessories Diagonal Eyepiece SB14Angle Measurement SpecificationsTelescope Vertical Angle CompensationDimensions Power sourceWater resistant Ambient temperature Vertical axisPage Certified