75
Now turn around the aiming component of the instrument
to aim at the offset point. Mention that the offset point must be
on the defined plane but not below the prism bar for concerns
of precision.
The coordinate of the offset point is obtained. Press soft
key „Next P‟ to enter the offset measurement of the next point;
press soft key „Record‟ to save the coordinate of the offset
point.
Finally, press key „ESC‟ to quit Plane Offset
measurement.
8.5 Column Offset Mode
Firstly, users 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.