Topcon GPT-3002W Series - Column Offset Measurement

7-16
7 DATA COLLECTION
7.3.4 Column Offset Measurement
If it is possible to measure circumscription point (P1) of column directly, the distance to the center of the
column (P0), coordinate and direction angle can be calculated by measured circumscription points (P2)
and (P3).
The direction angle of the center of the column is 1/2 of total direction angle of circumscription points
(P2) and (P3).
Example: Non-prism measurement
Operating procedure Operation Display
1
Press the [F3](MEAS) key and press the [F4]key to
get to the next soft key page.
[F3]
[F4]
2
Press the [F1](OFSET) key.
[F1]
3
Press the [F4](P1
↓
) key.
[F4]
4
Press the [F1](COLUMN OFFSET) key.
[F1]
5
Collimate the center of the column (P1) and press
the [F1](MEAS) key.
Measuring will start.
After the measurement, angle measuring display
of the left side (P2) will be shown.
Collimate
P1
[F1]
P
P
P
2
3
P
PT#
→
PT-11
PCODE :TOPCON
N
P
R.HT : 1.200 m
INPUT SRCH MEAS ALL
PT#
→
PT-11
PCODE :TOPCON
N
P
R.HT : 1.200 m
VH *SD NEZ P1
↓
OFSET PTL NP/P P2
↓
OFFSET 1/2
F1:ANG. OFFSET
N
P
F2:DIST. OFFSET
F3:PLANE OFFSET P
↓
OFFSET 2/2
F1:COLUMN OFFSET
N
P
P
↓
COLUMN OFFSET
Center
N
P
HD: m
MEAS --- NP/P ---
COLUMN OFFSET
Center
N
P
HD* [n] << m
>Measuring...