R2W PLUS
58
4.5.6 Offset Measurement Mode
There are four kinds of Offset Measurement Modes:
Angle Offset Measurement
Distance Offset Measurement
Plane
Offset Measurement
Column Offset Measurement
1) Angle Offset Measurement
This program is used to measure the point where it’s difficult to set prism. Place the prism
at the same horizontal distance from the instrument as that of point A0 to measure.
●When measuring coordinate of ground point A1 (projection of point A0), set instrument
height and prism height.
●When measuring coordinate of point A0,set instrument height only (Prism height is set
as 0).
●Under angle offset measurement mode, there are two methods to set vertical angle:
1. Free vertical angle: vertical angle ranges from up-and-down movement of telescope.
2. Lock vertical angle: vertical angle is locked and can’t range from up-and-down
movement of telescope.
Thus, if collimate A0 with the first method, vertical angle ranges from up-and-down
movement of telescope, and meantime slope distance(SD) and elevation difference(VD)
will change too.But if collimate A0 with the second method, vertical angle is locked in the
direction where prism is located and can’t range from up-and-down movement of
telescope.
