Column Offset Measurement - GPI -122 Instruction Manual

9.4 Column Offset Measurement

Sometimes we wish to obtain the coordinate of column center where we cannot
find. Fortunately, we can measure the distances of another points on the column,
in this time the plane offset measurement can be used. the figure is shown as
follow:
【Procedure of Column offset measurement】
Offset (Col)–Prism
HR: 1°55' 42"
SD:
HD:
VD:
Meas Mode
Offset (Col)–left edge
HR: 0°14' 19"
SD:
HD:
VD:
Mode
Offset (Col)–Right edge
HR: 3°35' 23"
SD:
HD:
VD:
Mode
Offset (Col)–Center
HR: 1°54' 49"
N:
E:
Z:
Next Mode
P2
P1
1.Press F1:【Meas】to start EDM then you can
obtain the data of a point on the column which is
4.836
4.832
shown as the picture on the left.
0.193
Enter
2.Aim at the left edge of the column, get its
4.836
azimuth.
4.832
0.193
Enter
4.836
3.Aim at the right edge of the column, get its
4.832
azimuth.
0.193
Enter
4.The coordinates of the column center is
4.975
0.166
calculated and shown as the picture as the left.
0.693
36
P0
P3