TECHNICAL REFERENCE MANUAL
5 Technical data
5.1 Measuring accuracy definition
The measuring accuracy corresponds to the ISO-recommendation ISO/R 1938-1971 with
a statistical confidence level of 95.4% (i.e. ± twice the standard deviation σ, refer to
diagram on the right). The typical measuring accuracy relates to average conditions for
measuring. It is ±1.0mm for the FLS-C(H) 10, ±1.5mm for the DLS-C(H) 15 and ± 3.0mm
for the DLS-C(H)/FLS-C(H) 30 valid in the tracking mode.
Maximum deviation may occur under unfavorable conditions such as bright sunlight or
when measuring to poorly reflecting or very rough surfaces. Measuring accuracy may
deteriorate by approximately ±0.02mm/m for distances above 30m.
The DLS-C(H)/FLS-C(H) does not compensate changes of atmospheric environment. These
changes can influence the accuracy if measuring long distances (>150m) under
conditions very different from 20°C, 60% relative humidity and 953 mbar air pressure.
The influences of the atmospheric environment are described in
B.Edlen: “The Refractive Index of Air, Metrologia 2”, 71-80 (1966)
5.2 Measuring performance influences
The DLS-C(H)/FLS-C(H) is an optical instrument, whose operation is influenced by environmental conditions. Therefore, the measuring range
achieved in use may vary. The following conditions may influence the measuring range:
Key Factors increasing range Factors reducing range
Target surface Bright and reflective surfaces such as the target plates
(See Accessories)
Matt and dark surfaces
Green and blue surfaces
Airborne particles Clean air Dust, fog, heavy rainfall, heavy snowfall
Sunshine Darkness Bright sunshine on the target
The measurement range may be influenced by the configuration of the measurement characteristic. See 9.3.2 Measuring characteristic
configuration (sNuc) on page 34.
The DLS-C(H)/FLS-C(H) does not compensate the influence of the atmospheric environment, which may be relevant when measuring long
distances (e.g. > 150m). These effects are described in:
B.Edlen: “The Refractive Index of Air, Metrologia 2”, 71-80 (1966)
Distance Laser Sensor Page 21/53
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