Operation Zoom20/30/35 Pro | 25
4.6 Distance Measurements - Guidelines for Correct Results
Description A laser distancer (EDM) is incorporated into the instruments. In all versions, the distance can be deter-
mined by using a visible red laser beam which emerges coaxially from the telescope objective. There are
two EDM modes:
RL measurements
• 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 reflectorless measurements or measurements
using reflective foils.
• Do not measure with two instruments to the same target simultaneously.
IR measurements • Accurate measurements to prisms should be made in IR-Default 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 inaccurate.
• 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 fraction 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.
WARNING
Due to laser safety regulations and measuring accuracy, using the Long Range Reflectorless EDM is only
allowed to prisms that are more than 1000 m (3300 ft) away.
• Prism measurements (IR) • Reflectorless measurements (RL)
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