1 Scope
This document specifies field procedures to be adopted when determining and evaluating
the
precision (repeatability) of rotating lasers and their ancillary equipment when used
in building
and surveying measurements for levelling tasks. Primarily, these tests are intended
to be field
verifications of the suitability of a particular instrument for the immediate task
at hand and
to satisfy the requirements of other standards. They are not proposed as tests for
acceptance or
performance evaluations that are more comprehensive in nature.
This document can be considered as one of the first steps in the process of evaluating
the
uncertainty of a measurement (more specifically a measurand). The uncertainty of a
result of a
measurement is dependent on a number of parameters. Therefore this document differentiates
between different measures of accuracy and objectives in testing, like repeatability
and
reproducibility (between-day repeatability), and of course gives a thorough assessment
of all
possible error sources, as prescribed by ISO/IEC Guide 98‑3 and ISO 17123‑1.
These field procedures have been developed specifically for in situ applications without
the
need for special ancillary equipment and are purposefully designed to minimize atmospheric
influences.