General Technical Data Of The Product - Leica Viva TS16 User Manual

7.12
System accuracy
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General Technical Data of the Product

Several factors can influence the accuracy of the system for determining the
location of a prism:
Internal ATRplus accuracy
•
Angular accuracy of the instrument
•
Type and centring accuracy of the prism
•
Selected EDM measuring program
•
External measuring conditions
•
Therefore, the overall pointing accuracy of the determined point location can
be lower than the given angular accuracy and the ATRplus accuracy.
The following paragraphs provide a short overview of these influencing factors
and their possible intensities.
Angular accuracy
The accuracy of angular measurements depends on the instrument type. The
angular accuracy for total stations is typically in the range from 0.5² to 5². The
resulting error depends on the measurement distance.
Angular accuracy
1²
3²
*
Orthogonal to the line of sight.
Refer to the data sheet of the respective instrument model for
☞
information about the angular accuracy.
EDM accuracy
The distance measurement accuracy consists of two parts: a fixed value and a
distance-dependent value (ppm-value).
Example: "Single measurements: 1 mm + 1.5 ppm"
The 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.
ATRplus accuracy
Automatic target aiming accuracies, like those of the ATRplus, are in general
the same as the stated angular accuracy. Therefore these accuracies are also
distance-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
selected EDM mode affects the ATRplus performance. Under good environ-
mental conditions and with a clean, properly aligned target the accuracy of the
automated target aiming is equivalent to the manual target aiming (presumed
valid calibration values).
*
Possible deviation at 100 m distance
~0.5 mm
~1.5 mm
Technical Data