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Introduction
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
elliminated by the dual axis
compensator.
Plumb line / Compensator
Direction of gravity. The compensator defines the plumb line within
the instrument.
Line-of-sight error (Hz-collimation)
The line-of-sight error is the deviation from the perpendicular
between tilting axis and line-ofsight. This could be eleminated by
measuring in both faces.
Zenith
Point on the plumb line above the
observer.
V-Index (Vertical index error)
With horizontal line-of-sight the Vcircle reading should be exactly
90°(100gon). The deviation from
this values is termed V-index (i).
Reticle
Glass plate within the telescope
with reticle.
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TC(R)403/405/407-1.0.0en