Distance Measurements - Guidelines For Correct Results - Leica FlexLine plus User Manual

4.6
Description
Non-Prism
measurements
Prism
measurements
WARNING
Red laser to prism
Red laser to
reflector tape
FlexLine plus, Operation

Distance Measurements - Guidelines for Correct Results

An EDM is incorporated into the FlexLine plus instruments. In all versions, the distance
can be determined by using a visible red laser beam which emerges coaxially from the
telescope objective. There are two EDM modes:
• Prism measurements
TSOX_093
• When a distance measurement is triggered, the EDM measures to the object which
is in the beam path at that moment. If a temporary obstruction, for example a
passing vehicle, heavy rain, fog or snow is between the instrument and the point
to be measured, the EDM may measure to the obstruction.
• Be sure that the laser beam is not reflected by anything close to the line of sight,
for example highly reflective objects.
• Avoid interrupting the measuring beam while taking Non-Prism measurements or
measurements using reflective foils.
• Do not measure with two instruments to the same target simultaneously.
• Accurate measurements to prisms should be made in Precise+ mode.
• Measurements to strongly reflecting targets such as traffic lights in Prism mode
without a prism should be avoided. The measured distances may be wrong or inac-
curate.
• When a distance measurement is triggered, the EDM measures to the object which
is in the beam path at that moment. If for example people, cars, animals, or
swaying branches cross the laser beam while a measurement is being taken, a frac-
tion of the laser beam is reflected from these objects and may lead to incorrect
distance values.
• Measurements to prisms are only critical if an object crosses the measuring beam
at a distance of 0 to 30 m and the distance to be measured is more than 300 m.
• In practice, because the measuring time is very short, the user can always find a
way of avoiding unwanted objects from interfering in the beam path.
Due to laser safety regulations and measuring accuracy, using the Long Range Reflec-
torless EDM is only allowed to prisms that are more than 1000 m (3300 ft) away.
• Prism (>4.0km) mode enables distance measurements of over 4.0 km to standard
prisms using the visible red laser beam. Available for
• The visible red laser beam can also be used to measure to reflective foils. To guar-
antee the accuracy the red laser beam must be perpendicular to the reflector tape
and it must be well adjusted.
• Make sure the additive constant belongs to the selected target (reflector).
• Non-Prism measurements
instruments.
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