Technical data

TECHNICAL REFERENCE MANUAL
1.4 Measurement range
The DLS-A(H) is an optical instrument, whose operation is influenced by environmental conditions. Therefore,
the measurement range achieved in the application can vary. The following conditions may influence the
measurement range:
Key Factors increasing range Factors reducing range
Target surface Bright and reflecting surfaces such as the
target plates (See 9 Accessories on page 32)
Matt and dark surfaces
Green and blue surfaces
Airborne particles Clean air Dust, fog, heavy rainfall, heavy snowfall
Sunshine Darkness Bright sunshine at target
The DLS-A(H) does not compensate the influence of atmospheric environment, which may be relevant when
measuring long distances (e.g. > 150m). This effects are described in:
B.Edlen: “The Refractive Index of Air, Metrologia 2”, 71-80 (1966)
1.5 Prevention of erroneous measurements
1.5.1 Rough surfaces
On a rough surface (e.g. coarse plaster), measure against the center of the illuminated area. To avoid measuring
to the bottom of plaster joints use a target plate (see accessories) or board.
1.5.2 Transparent surfaces
To avoid measuring errors, do not measure towards transparent surfaces such as colorless liquids (such as water)
or (dust free) glass. For unfamiliar materials and liquids, always take a trial measurement.
)
Erroneous measurements can occur when aiming through panes of glass,
or if there are several objects in the line of sight.
1.5.3 Wet, smooth, or high-gloss surfaces
1 Aiming at an “acute“ angle deflects the laser beam. The DLS-A(H) may receive a signal that is
too weak (error message 255) or it may measure the distance targeted by the deflected laser beam.
2 If aiming at a right angle, the DLS-A(H) may receive a signal that is too strong (error message 256).
1.5.4 Inclined, round surfaces
Measurement is possible as long as there is enough target surface area for the laser spot.
1.5.5 Multiple reflections
Erroneous measurements can occur in the case that the laser beam is reflected from other objects than the
target. Avoid any reflecting object along the measurement path.
Distance Laser Sensor Page 5/40