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Instrument Errors of a Total Station
Ideally, the total station should meet the following requirements:
If these conditions are not met, the following terms are
used to describe the particular errors:
a)Line of sight ZZ perpen­dicular to tilting axis KK
b)Tilting axis KK perpen­dicular to vertical axis VV
c)Vertical axis VV strictly vertical
d)Vertical-circle reading precisely zero at the zenith
a)Line-of-sight error, or colli­mation error c (deviation
from the right angle bet­ween the line of sight and the
tilting axis)
c
Line-of-sight error (c)
(Hz collimation)
V
Z
K
b)Tilting-axis error a (devia­tion from the right angle
between the tilting axis and the vertical axis)
Z
K
a
Tilting-axis error (a)
V
18 | Instrument Errors