M00000203
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ISO 12858-1 2nd Edition, August 1, 2014 Optics and optical instruments - Ancillary devices for geodetic instruments - Part 1: Invar levelling staffs
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 12858 specifies the most important requirements
of Invar levelling staffs used in geodesy and industry for precise
measurement of heights in combination with either an
optical-mechanical level equipped with a parallel plate micrometre,
or a digital level of comparable precision.
It is applicable to
— classical staffs with graduation lines and numbering;
— staffs used in digital levelling with code patterns.
NOTE The measurement uncertainty of the height differences
depends on a multitude of influencing factors of the whole
measuring system including the levelling instruments.
This part of ISO 12858 is not applicable to the detailed design
and construction of Invar levelling staffs (e.g. materials,
handles, fixing points for the struts, fixing of the Invar strip
and of the circular level), which may be selected by the
manufacturer as appropriate.