General Machine Products RD7000 Traceable Rod Detection - Manual (Page 19)

RD7000 Operation Manual 13
4.3 Pinpoint
Pinpointing a target line in peak mode, defines the exact
position of a target line after it has been traced and its
position is approximately known. Start with medium
output power from the transmitter, medium frequency on
the transmitter and receiver, and peak mode on
the receiver.
Set the receiver sensitivity to approximately 50%.
NOTE: it may be necessary to adjust the sensitivity
level throughout the pinpointing to keep the bar graph
on scale.
To select Peak/Null mode:
Press and release the key to switch the
receiver on.
Press the antenna key until the Peak/Null mode
icon is displayed on the LCD.
4.2 Trace
Line tracing can be accelerated by switching the receiver
to null response.
Move the receiver left and right while walking along the
path of the line to observe the null directly over the line
and a peak response to each side of the line. As you
move the receiver over the line, the left and right arrows
(and an accompanying tone) will indicate if the target line
is to the left or right of the receiver.
Periodically switch to peak mode, locate the target line,
and verify its exact position.
1.
2.
Peak
mode
Null
mode
True
Position
Peak
Position
Null
Position
Figure 4.1 Line
tracing
Figure 4.2: Pinpointing a
target line
Figure 4.3: Pinpointing with
Peak/Null
With the antenna perpendicular to the line, make
traverses across the line. Define the point of
maximum response.
Without moving the receiver, turn it round as if
it is on a pivot. Stop at the point of maximum
response.
Hold the receiver vertical with the antenna just
above the ground and move the receiver from
side to side across the line. Stop at the point of
maximum response.
With the end of the antenna close to the ground,
repeat steps 2 and 3.
Mark the position and direction of the line.
Repeat the steps of the procedure to increase pinpoint
accuracy.
1.
2.
3.
4.
5.