Leica Geosystems TPS110C - Manual (Page 35)

Measuring 35
Distance measurement, continued
Reflectorless
Be sure that the laser
beam is not reflected by
anything close to the line of
sight (e.g. highly reflective
objects).
When a distance
measurement is
triggered, the EDM measures to
the object which is in the beam
path at that moment. In case of
temporary obstruction (e.g. a
passing vehicle, heavy rain, fog
or snow) the EDM may measure
to the obstruction.
When measuring longer
distances, any
divergence of the red laser
beam from the line of sight
might lead to less accurate
measurements. This is because
the laser beam might not be
reflected from the point at which
the crosshairs are pointing.
Therefore, it is recommended to
verify that the R-laser is well
collimated with the telescope
line of sight
(refer to the chapter
"Checking and adjusting").
Do not measure with two
instruments to the same
target simultaneously.
Red laser to prisms
WARNING:
Due to laser safety
regulations and
measuring accuracy, using the
visible red laser (RL) is only
allowed to prisms that are more
than 1000 m (3300 ft) away.
Accurate measurements
to prisms should be
made with the standard program
(Infrared mode).
Red laser to reflector tape
The visible red laser beam can
be used to measure to reflective
foils, also. To guarantee the
accuracy the red laser beam
must be perpendicular to the
reflector tape and it must be well
adjusted
(refer to the chapter
"Checking and adjusting").
Make sure the additive
constant belongs to the
selected target (reflector).