RD4000 Locating System User Manual
Page 30
The transmitter applies its signal most strongly to the lines directly below it, which are then located with the
receiver. Move the transmitter from side to side to establish the highest signal which indicates that the
transmitter is also directly above the line(s).
Mark the ground at the point of each peak signal detected with the receiver. Repeat the search along any other
possible paths of lines.
Once the positions of any lines have been marked, reverse positions, place the transmitter over and along each
line in turn, and trace the line out of the search area.
Taking depth readings
Electronic depth measurement to a line is possible down to depths of
3m/10ft when the line has been energized with the transmitter signal.
Passive signals on lines are not suitable for measuring depth because
accuracy is questionable due to the passive signal being present on
more than one line.
Measurement is to the centre of the pipe or cable. Depth of cover is
necessarily less than the reading, possibly critically so on large
diameter pipes.
Precautions:
Do not make depth measurements near bends or tees in the line. Go at least 5 metres/16 feet
from a bend for best accuracy.
To avoid signal distortion, do not apply the signal by induction. If there is no choice, place the
transmitter at least 30 paces from the point of any depth measurement.
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