RD4000 Locating System User Manual
Page 61
Because of rapid signal loss and a combination of large surface area and very conductive soil there may be
problems applying a suitable signal for tracing a large diameter pipe. It may be necessary to use a high power,
low frequency tracing signal.
It is necessary to define a method of recording target line position and depth before starting work in the boat or
on the seabed.
Transmitter Accessories
Clamps
The transmitter clamp fits around a pipe or cable and safely applies a signal to a live cable without interrupting
or disconnecting the supply. The clamp applies a very discriminating signal to a target line with reduced
coupling to other lines. A clamp can sometimes be a more effective method of applying the signal than direct
connection.
WARNING. WHEN CLAMPING AROUND A POWER CABLE ENSURE THAT THE CLAMP IS CONNECTED
TO THE TRANSMITTER AT ALL TIMES.
The clamp may buzz or vibrate if it is placed around a power cable that has significant net current flow. This is
normal and does not harm the equipment.
The target line will carry the strongest signal. The other lines will carry the weaker return signal. If the system
comprises only two conductors, they may carry equal signals.
Connecting the clamp
• Plug the clamp into the transmitter output socket.
• Put the clamp around the pipe or cable and ensure that the jaws are closed. Switch the transmitter on.
The line should be grounded (earthed) on each side of the clamp for the signal to transfer to the line. Ground
the line if necessary. An insulated cable may be traced even if it has no actual ground connection, providing a
reasonable length is buried either side of the clamp to provide capacitive coupling to ground (earth).
Note: It is not necessary to make a ground connection from the transmitter when using the clamp.
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