STONEX R20 - Technical Terms and Abbreviations

Stonex R20 – User Manual 12
3.2. Technical Terms and Abbreviations
Technical terms /
Abbreviations
Descripition
Telescope
Optical telescope for observation and aiming, also the collimated part of the
Electronic Distance Meter (EDM).
Collimation Axis / CA
Line from the reticle to the centre of the objective, as well as telescope axis and
EDM laser axis.
Standing Axis / SA
Vertical rotation axis of the instrument.
Tilting Axis / TA
Horizontal rotation axis of the telescope.
Instrument Center
(Zero Point)
The intersecting point of CA, SA and TA, as well as the zero point of EDM.
Zenith
The top point of the direction which gravity is through the Instrument Center, as
well as Plumb Line and plummet laser axis.
Zenith Angle / ZA
The angle between CA and Zenith.
Vertical Angle / VA
The angle between CA and horizontal line.
Under ideal instrumentation and set-up conditions, the following properties are desirable:
• The SA, the laser plummet axis, and the zenith/plumbline are co-linear and pass through the current
station point.
• The tubular level and the circular level are perpendicular to the SA.