Remarks On Measuring Accuracy - Leica DISTO classic User Manual

*The measuring accuracy corresponds to the ISO-
recommendation ISO/R 1938-1971 with a statistical
confidence level of 95% (i.e. ± twice the standard
deviation, refer to diagram below).
The typical measuring accuracy relates to average
conditions for measuring within the specified range.
It is not valid for the user functions Fnc 2, 3, 4, and
is not valid in the tracking mode.
The maximum measuring error relates to
unfavourable conditions such as:
- highly-reflecting surfaces (e.g. reflector tapes),
- operating at the limits of the permitted
temperature range, adaption to ambient
temperature interrupted (page 54)
- very bright ambient conditions, strong heat
shimmer and can be up to ± 5 mm (twice the
standard deviation).
** At long range ± 30 ppm (± 3 mm/100 m) plus
short range error. Range increases, the better the
laserlight is reflected from the target area (diffuse,
not reflective), and the brighter the laserpoint is
compared to the surrounding luminosity (indoors,
dawn).
From appr. 40 - 50 m use target plate, brown side
(page 40)
58