Adjusting Line-Of-Sight And Vertical Index Error - Leica TS01 User Manual

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11.1.3
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Line-of-sight error
Vertical index error
Access
Tools
The instrument should be protected from direct sunlight to
avoid thermal warming.
It is also recommended to avoid strong heat shimmer and air
turbulence. The best conditions are early in the morning or
with overcast sky.
Before starting to work, the instrument has to become acclimatised to the
ambient temperature. Take at least 15 minutes into account or approximately
2 minutes per °C of temperature difference from storage to working environ-
ment.

Adjusting Line-of-Sight and Vertical Index Error

The procedures and conditions required to correct line-of-sight and vertical
index errors are the same, therefore the procedure will only be described
once.
The line-of-sight error, or horizontal collimation error is the deviation from the
perpendicular between the tilting axis and the line of sight.
a
c
d
b
a
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A vertical index error exists, if the 0° mark of the vertical circle reading does
not coincide with the mechanical vertical axis of the instrument, also called
standing axis.
The V index error is a constant error that affects all vertical angle readings.
a
d
b
c
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1. Select Tools in the Main Menu.
2. Select Check & Adjust in the Tools menu.
a Tilting axis
b Line perpendicular to tilting axis
c Horizontal collimation, or line-of-sight, error
d Line-of-sight
a Mechanical vertical axis of the instrument, also
called standing axis
b Axis perpendicular to the vertical axis. True
90°
c Vertical angle is reading 90°
d Vertical index error
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By determining the vertical index error the
electronic level is adjusted automatically.
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