This standard specifies the general and performance requirements for surveying instruments like theodolites, levels, and tacheometers. It covers materials, workmanship, optical characteristics, accuracy standards, and testing procedures to ensure the quality and reliability of the equipment for survey work.
Lays down general requirements applicable to all types of surveying instruments regarding their design, construction, and performance.
Quick Reference Values
Least count of vernier for precision theodolite1 second
Magnification for precision theodolite (typical)28X
Sensitivity of plate level bubble for theodolite60 to 90 seconds per 2 mm
Permissible error in horizontal collimation for theodolite20 seconds
Permissible closing error for precise levelling (per km)5 mm
Practical Notes
This code serves as a crucial reference for procurement, helping engineers specify the required quality and accuracy of surveying instruments.
While drafted for optical instruments, its fundamental principles of accuracy, stability, and environmental resistance are still highly relevant for evaluating modern electronic instruments like Total Stations and GNSS receivers.
Always verify that an instrument's calibration certificate meets the permissible error limits defined in this standard for its specific class.