Angle Offset Measurement - GPI -122 Instruction Manual

Offset (dist)–Prism
HR: 356°50' 27"
SD:
HD:
VD:
Meas T.H. Mode
Offset (dist)–Prism
HR: 356°50' 27"
SD:
HD:
VD:
Meas Mode
Offset (dist)–Target
HR: 31°40' 09"
SD: 14.902
HD:
VD:
Next Mode

9.2 Angle Offset Measurement

Sometimes we need to measure a coordinate of a point such as A1 whose position
cannot place a prism. assum that we know that the horizontal distance from CI to A1
and the distance from CI to prism is equal. the angle offset measurement can be used.
the figure is shown as follow.
Note:
If you need the
coordinate of A0
you should set the
height of prism to
zero. if you need
the coordinate of
A1 you should set
the height of prism
to the real height.
2. Aim at the prism to start EDM, if you need the
coordinate of A0 you should set the height of prism
to zero. if you need the coordinate of A1 you
should set the height of prism to the real height.
3. The result is shown as the picture on the left.
4.387
Press F4:【Enter】to accept the result.
4.373
0.855
Enter
4. The result of target point is shown as the picture
on the left. if you wish to display
coordinate then you must press【CORD】,or if you
9.193
wish display distance then you must press 【DIST】 .
0.855
5. When you press F1: 【Next】 ,you will be informed
to save the result, if nessary you can press【ENT】
to save the result.
HD(r)
Center of instrument(CI)
HD(r)=HD(f)
HD(r)=Horizontal distance from CI to P
HD(f)= Horizontal distance from CI to A0
33
Prism(P)
A0
HD(f)
A1