Zoom20/30/35 Pro | 98Glossary
17 Glossary
Instrument axis
Plumb line / compen-
sator
Standing axis inclina-
tion
Zenith
Crosshairs
Line-of-sight error
(horizontal collimation)
Vertical index error
ZA = Line of sight / collimation axis
Telescope axis = line from the cross hairs to the
center of the objective.
SA = Standing axis
Vertical rotation axis of the telescope.
KA = Tilting axis
Horizontal rotation axis of the telescope. Also known
as the Trunion axis.
V = Vertical angle / zenith angle
VK = Vertical circle
With coded circular division for reading the vertical
angle.
Hz = Horizontal direction
HK = Horizontal circle
With coded circular division for reading the horizontal
angle.
TSOX_002
SA
SA
SA
SA
Hz0
Hz
KA
KA
KA
VK
HK
ZA
ZA
V
Direction of gravity. The compensator defines the plumb line within the instru-
ment.
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 horizontal direction or
vertical angle is eliminated by the dual axis compensator.
Point on the plumb line above the observer.
Glass plate within the telescope with reticle.
The line-of-sight error (c) is the deviation from the perpendicular between the
tilting axis and line of sight. This could be eliminated by measuring in both faces.
TS0X_005
c
With a horizontal line of sight the vertical circle reading should be exactly
90°(100 gon). The deviation from this value is termed the Vertical index error (i).
i
TS0X_006
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