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© Leica
TPS-System 1000-2.3.1en
97
Long distances
Over longer distances or in inclement meteorological
conditions it is better to use the GPH3 three-prism
holder or the GPH11 eleven-prism holder, with the
corresponding number of reflectors, irrespective of
whether the EDM is attachable or already built in.
* The accuracies quoted are valid when the retro tape is
targeted at an angle of up to 45°.
Target-mark size
[mm]
Range
[metres]
Accuracy *
(standard deviation)
20 x 20
2 to 40
3 mm
40 x 40
20 to 100
3 mm
60 x 60
60 to 180
3 mm
Technical data for measurements to retro foils
Summary
Prism
Prism constant
Leica circular prism
0 mm
Leica retro tape
+34.4 mm
GRZ4 360° reflector
+23.1 mm
The prism constant is set automatically when the
correct type of reflector is used.
If another make or type of prism is used it is advisable
to determine the constant on a calibration range.
Take care when pointing through windows or if
reflective surfaces are present in the field of view.
Incorrect readings may result.
Other reflectors for precision measurement and for
special applications are also available. Please contact
your Leica agency.