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Topcon AT-G4 User Manual

Topcon AT-G4
14 pages
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#TOPCOR
INSTRUCTION
MANUAL
AUTO LEVEL
AT-G4
AT-G6
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Topcon AT-G4 Specifications

General IconGeneral
TypeAutomatic Level
Water ResistanceYes
Compensator Range±15'
Circular Level Sensitivity10'/2 mm
Stadia Multiplication Constant100
Stadia Addition Constant0
Operating Temperature Range-20°C to +50°C
Water and Dust ProtectionIPX6
Compensator Setting Accuracy0.5"

Summary

Basic Operating Procedures

Setting Up the Tripod

Detailed steps for correctly setting up the tripod for instrument use.

Attaching the Instrument to the Tripod Head

Instructions for securely mounting the auto-level onto the tripod head.

Setting the Instrument Up Over the Point

Procedures for precisely positioning the instrument directly above a survey point using a plumb bob.

Leveling the Instrument

Guide to properly centering the instrument's circular level bubble using leveling screws.

Adjusting the Eyepieces

Steps to adjust the telescope eyepiece for clear viewing of cross-hairs and target.

Sighting and Focusing

Instructions for aiming at a target and achieving a sharp focus using the instrument.

Operations

Leveling or Determining Differences in Elevation

Using the auto-level to determine elevation differences between points with a leveling rod.

Measuring a Horizontal Angle

Procedures for measuring horizontal angles using the instrument's graduated horizontal circle.

Stadia Surveying

Method for measuring distances using stadia hairs on the instrument and a graduated rod.

Adjustment

Adjustment of the Circular Level

Steps to correct the circular level bubble's centering after telescope rotation.

Collimation of the Instrument

Procedure to ensure the horizontal line of sight is parallel to the telescope's axis.

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