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Operation TPS1200 87
When measurements are being made using the red laser EDM, the results may be
influenced by objects passing between the EDM and the intended target surface.
This occurs because reflectorless measurements are made to the first surface
returning sufficient energy to allow the measurement to take place. For example, if
the intended target surface is the surface of a road, but a vehicle passes between
the EDM and the target surface as DIST (F2) or ALL (F1) is pressed, the measure-
ment may be made to the side of the vehicle. The result is the distance to the vehicle,
not to the road surface.
If using the red laser EDM for long range measurements to a prism, and an object
passes within 30 m of the EDM as DIST (F2) or ALL (F1) is pressed, the distance
measurement may be similarly effected due to the strength of the laser signal.
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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.
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Accurate measurements to prisms should be made in Infrared EDM mode.
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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 meas-
ured, the EDM may measure to the obstruction.