Telescope Positions 4 3; Terms And Their Description - Hilti POT 10 Manual De Instrucciones

Vertical circle / vertical angle
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As the vertical circle can be aligned at 0° to the direction of gravity or at 0° to horizontal, angles can be determined
relative to the direction of gravity, so to speak.

3.2 Telescope positions 4 3

The term "telescope position" is used to ensure that readings from the horizontal circle can be correctly assigned to
the vertical angle, i.e. the position of the telescope relative to the control panel determines in which "position" the
measurements have been taken.
When the tool appears as shown in this view, this is described as "telescope position 1". 4
When the tool appears as shown in this view, this is described as "telescope position 2". 3

3.3 Terms and their description

Target axis
Trunnion
Vertical axis
Zenith
Horizon
Nadir
Vertical circle
Vertical direction
Vertical angle (VA)
Elevation angle
Horizontal circle
Horizontal direction
26
A line through the cross hairs and center of the objective lens (telescope
axis).
The telescope pivot (tilt) axis.
The pivot axis of the entire tool.
The zenith is the point that lies in the direction of gravity, but in the op-
posite, upward direction.
The horizon is the direction perpendicular to the direction of gravity –
generally known as horizontal.
Nadir is the name given to the downward direction in which gravity acts.
The vertical circle is the circle of angles described by the telescope when
it is tilted upwards or downwards.
A reading taken from the vertical circle is known as the vertical direction.
A vertical angle is a reading from the vertical circle.
The vertical circle is usually aligned with the direction of gravity with the
aid of the compensator, with the zero point at the zenith.
An elevation angle of zero refers to the horizon (horizontal plane). Positive
angles are above horizontal (upwards) and negative angles are below
horizontal (downwards).
The horizontal circle is the complete circle of angles described by the
tool when it is rotated.
A reading taken from the horizontal circle is known as the horizontal dir-
ection.