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Standing axis inclination
Angle between plumb line and
standing axis. Standing axis tilt is
not an instrument error and is not
eliminated by measuring in both
faces. Any possible influence it may
have on the Hz-direction resp. V-
angle is eliminate by the dual axis
compensator.
Line-of-sight error (Hz-collima-
tion)
The line-of-sight error is the devia-
tion from the perpendicular
between tilting axis and line-of-
sight. This could be eliminated by
measuring in both faces.
V-Index (Vertical index error)
With horizontal line-of-sight the V-
circle reading should be exactly
90°(100gon). The deviation from
this values is termed V-index (i).
Introduction
Plumb line / Compensator
Direction of gravity. The compen-
sator defines the plumb line within
the instrument.
Zenith
Point on the plumb line above the
observer.
Reticle
Glass plate within the telescope
with reticle.
13
TPS400-5.0.1en
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