General Machine Products RD7000 Traceable Rod Detection - Manual (Page 26)

20 RD7000 Operation Manual
Section 6. – General Locating tips
6.1 Eliminating services
6.1.1 Induction
If several conductors are running parallel and it is not
possible to connect a transmitter, each line may be
located separately. Proceed as follows:
Perform a sweep of the area to find the position
and number of conductors in the area.
Map the direction in which the conductors
are going.
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2. Figures 6.1 – 6.4: Interference
from services
To trace the lines:
Select induction mode on the transmitter.
Select the same frequency as on the receiver.
Place the transmitter on its side and in line with a
conductor.
Ensure the conductor is directly below the
transmitter.
This will null the signal directly below the
transmitter and, in addition, enable the other
conductors to be located.
Locate each conductor and mark its position.
Move the transmitter down the route and continue
locating and marking.
Trace each conductor out of the search area until
the target line can be accurately located.
6.1.1 Unwanted signal coupling
Unwanted coupling of the signal from the target line to
another nearby line is one of the most common location
problems. It leads either to an error in the marked position
and depth of the target line or to marking the wrong
line. A certain degree of coupling is unavoidable in many
situations but there are ways in which a careful user can
reduce coupling and increase location reliability.
Avoid applying the signal by induction. The signal
may be coupling to more than one line directly from
the transmitter. Use the signal clamp where possible.
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