M00001591
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ISO 17123-4 2nd Edition, June 1, 2012 Optics and optical instruments - Field procedures for testing geodetic and surveying instruments - Part 4: Electro-optical distance meters (EDM measurements to reflectors)
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 17123 specifies field procedures to be adopted
when determining and evaluating the precision (repeatability) of
electro-optical distance meters (EDM instruments) and their
ancillary equipment when used in building and surveying
measurements. This part of ISO 17123 is applicable to
reflector-type EDM instruments only and is not designed to
determine the precision of non-prism EDM types. 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 part of ISO 17123 can be thought of 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 we
differentiate between different measures of accuracy and objectives
in testing, like repeatability, reproducibility (e.g. between day
repeatability), and of course a thorough assessment of all possible
error sources, as prescribed by ISO/IEC Guide 98-3 and by 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.