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17 OFFSET MEASUREMENT
The positions of the target point and
the offset point are shown at the left.
Target p a n t
In this case, determine the slope dis-
tance
t o the target point when the
horizontal distance is 1.5m.
Note : The offset point should be po-
sitioned so that the line con-
necting the target point and
offset line is at a 90" angle to
Instrument statlon
the line connecting the instru-
ment station and offset point.
(Sight the offset point and measure)
& j w m
1) Set the reflecting prism at the off-
set point, sight the centre of
it
.
Starts the d~stance measurement
correctly, and in Theodolite mode
or Basic mode,
press either
&j
,
a
,
or
.
After about 4.7 seconds (Fine
measurement mode), the dis-
3.21om
tance value, thevertical angle and
the horizontal angle are displayed
HAR
and stored i n t h e instrument
memory.
s t o p the measurement
2)
For Repeat measurement mode,
press
w
.
To Offset Measurement mode
m &
3) Press
and
@
.
The display appears as at left.
Offset
The display asks you t o select one
of the following options:
1. Input the horizontal distance
between the target point and
the offset point.
2.
Sight the direction of the tar-
get point.
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