Product Manual

13.3 Calibrating Line-of-Sight and Vertical Index Error
The line-of-sight error, or horizontal collimation error is the deviation from the perpendicular
between the tilting axis and the line of sight. The effect of the line-of-sight error to the horizontal
direction increases with the vertical angle.
a
b
d
c
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a Tilting axis
b Line perpendicular to tilting axis
c Horizontal collimation, or line-of-sight, error
d Line-of-sight
The vertical circle should read exactly 90° (100 gon) when the line of sight is horizontal. Any
deviation from this figure is termed vertical index error. This is a constant error that affects all
vertical angle readings.
b
c
d
a
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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 automat-
ically
1. Select Tools from the MAIN MENU.
2. Select Calibr. from the TOOLS MENU.
3. Select HA-collimation or Vertical Index.
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.
1. Level the instrument with the electronic level.
Refer to "Level up with the electronic level step-
by-step".
2. Aim at a point approximately 100 m from the
instrument which is within 5° of the horizontal.
± 5°
~ 100 m
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Line-of-sight error
Vertical index error
Access
☞
Calibration step-by-step
Calibration 119