Example: "Single measurements: 1 mm + 1.5 ppm"
T
he EDM accuracies for prism and reflectorless measurements can differ. Addi-
tionally, the accuracies can differ depending on the used technologies.
☞
Refer to the appropriate data sheet for information about the EDM
accuracy.
ATR accuracy
Automatic target aiming accuracies, like those of the ATR, are in general the
same as the stated angular accuracy. Therefore these accuracies are also dis-
tance-dependent parameters.
External impacts, like heat shimmer, rain (prism surface covered by rain drops),
fog, dust, strong background lights, dirty targets, alignment of the targets etc.
can have a significant influence on the automated target. In addition the selec-
ted EDM mode affects the ATR performance. Under good environmental condi-
tions and with a clean, properly aligned target the accuracy of the automated
target aiming is equivalent to the manual target aiming (presumed valid cali-
bration values).
Type and centring accuracy of the prism
The prism centring accuracy depends mainly on the used prism type, for exam-
ple:
Prism type Centring accuracy
Leica GPR1 Circular prism 1.0 mm
Leica GPH1P Precision circular prism 0.3 mm
Leica GRZ122 360° prism 2.0 mm
Leica GRZ4 360° prism 5.0 mm
☞
Refer to the white paper "Leica Surveying Reflectors" for information
ab
out the different centring accuracies.
Additional influencing factors
When determining absolute coordinates, the following parameters can also
a
ffect the resulting accuracy:
•
Environmental conditions: temperature, air pressure and humidity
•
Typical instrument errors, such as horizontal collimation error or index
error.
•
Proper functioning of laser plummet or optical plummet
•
Correct horizontal levelling
•
Setup of the target
•
Quality of additional equipment, such as tribrach or tripod.
Type Value
Magnification 30x
Free Objective aperture 40mm
Focusing 1.7m/5.6ft to infinity
Field of view 1°30’/1.66gon
2.7m a
t 100m
Telescope
Technical Data 69
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