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When the [DIST] is triggered, the EDM measures the object which is in the beam path
at that moment.
If e.g. people, cars, animals, swaying branches, etc. cross the laser beam while a
measurement is being taken, a fraction of the laser beam is reflected and may lead to
incorrect distance values.
Avoid interrupting the measuring beam while taking reflectorless
measurements or measurements using reflective foils.
Reflectorless EDM
●Ensure that the laser beams cannot be reflected by any object nearby with high
reflectivity.
●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, snow, frog, etc.), the EDM may measure to the
obstruction.
●When
measuring longer distance, 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.
●Do not collimate the same target with the 2 total stations simultaneously.
Accurate measurements to prisms should be made with the standard program
(infrared mode).
Red Laser Distance Measurement Cooperated with Reflective Foils.
The visible red laser beam can also be used to measure to reflective foils. To guarantee
the accuracy the red laser beam must be perpendicular to the reflector foil and it must
be well adjusted
Make sure the additive constant belongs to the selected target (reflector).
6.2.1 Setting Atmosphere Correction
●
Distance measurement is influenced directly by the atmospheric conditions of
the air in which distance measurement are taken.
In order to take into consideration these influences distance measurements are
corrected by using atmospheric correction parameters.
Temperature: Air temperature at instrument location.
Pressure: Air pressure at instrument location.
Atmos PPM: Calculated and indicated atmospheric PPM.
6.2.1.1 Calculation of Atmospheric Correction
●The value of Atmospheric Correction can be influenced by air pressure, air
temperature and the height. The calculating formula is as follows: (calculating unit
:
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