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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
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