What are the essential field checks for a total station as per this code?

Clause 5 recommends checks for the plate level, circular level, vertical and horizontal collimation, and the optical plummet.

What is the correct procedure for setting up the instrument?

Clause 6.2 outlines the procedure for setting up the tripod, mounting the instrument, and then performing centering and levelling over a station point.

Does this code specify the accuracy required for a survey?

No, this code describes the instrument's operational practice. The required survey accuracy is project-specific and should be defined in the project's technical specifications.

IS 13611

: 1992

Code of practice for total station instruments

CurrentFrequently UsedCode of PracticeBIMGeotechnical · Surveying and Geotechnical Investigation

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This standard provides a code of practice for the use of total station instruments in surveying. It details the instrument's components, classification, necessary field checks and adjustments, standard operational procedures for measurement, and guidelines for proper care, maintenance, and transportation.

Lays down general requirements and methods of test for total station instruments used in surveying and mapping.

Quick Reference Values

Typical angular accuracy range1 to 5 arc-seconds

Typical EDM accuracy formula±(2 mm + 2 ppm x D)

Typical plate level sensitivity20 to 40 arc-seconds / 2 mm

Typical optical plummet accuracy0.5 mm at 1.5 m instrument height

Practical Notes

Always perform basic field checks (e.g., collimation, horizontal axis, compensator) at the start of a major project or if the instrument has been subjected to shock.

Ensure the tripod is firmly set up on stable ground to minimize instrument settlement errors, which are a common source of inaccuracies.

Atmospheric corrections for temperature and pressure are crucial for achieving high accuracy in Electronic Distance Measurement (EDM) over long distances.