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Compensator index
errors (l, t)
Automatic aiming col-
limation errors
266
The vertical index error (i) is a constant error that affects all vertical angle read-
ings.
a b
b
c
008370_001
The compensator index errors (l, t) occur, if the vertical axis of the instrument
and the plumb line are parallel but the zero points of the compensator and the
circular level do not coincide. The calibration procedure electronically adjusts
the zero point of the compensator.
A longitudinal component in direction of the telescope and a transversal com-
ponent perpendicular to the telescope define the plane of the dual axis com-
pensator of the instrument.
The longitudinal compensator index error (l) has a similar effect as the vertical
index error and affects all vertical angle readings.
The transversal compensator index error (t) is similar to the tilting-axis error.
The effect of this error to the horizontal angle readings is 0 at the horizon and
increases with steep sightings.
d
c
b
TS_075
The ATRplus collimation error is the angular divergence between the line of
sight, which means the direction in which the crosshairs point, and the ATRplus
CCD camera axis, which detects the centre of the prism. The horizontal and
vertical components of the ATRplus calibration errors correct the horizontal and
vertical angles to measure exactly to the centre of the prism.
a
a
Mechanical vertical axis of the
instrument, also called stand-
d
ing axis
b
Plumb line
c
Longitudinal component (l) of
the compensator index error
d
Transversal component (t) of
the compensator index error
a
a
Centre of prism
b
Crosshairs
c
V component of ATRplus colli-
mation error
d
Hz component of ATRplus col-
limation error
Settings - TS instrument
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