52
Now turn around the alidade to aim at the offset point.
Mention that the offset point must be on the defined plane but
not below the prism bar, otherwise the result will not be correct.
The value of coordinate is being refreshed in process of aiming.
Press [Next P] to enter the offset measurement of next point
and press [Save] to record the result.
Finally, press key ‘ESC’ to quit the Plane Offset
measurement.
8.5 Offset (Column)
Firstly, you should measure the azimuth angle and
coordinate of ‘P1’ on the cylinder under this mode. Then
calculate the horizontal distance, azimuth angle and coordinate
of the cylinder by measuring the surface points of tangency P2
and P3.
The average value of P2 and P3 is the azimuth angle of the
cylinder.
P2
P0
P3
P1
PO’
In the menu of “Offset”, select “5. Offset (Column)” to
enter the interface of “Offset (Column) –Prism”:
