RD4000 Locating System User Manual
Page 47
Connecting the leads
WARNING. Always connect the leads before switching the transmitter on. Do not touch the lead ends
with the transmitter switched on but not connected to the earth stake.
WARNING. Before inserting a ground stake carry out a passive sweep of the area to ensure there are no
buried cables where you are going to insert the ground stake.
• Plug the one end of the direct connection lead into the transmitter accessory socket and connect the red
lead to the target line
• Push a ground stake into the ground and clip the black ground lead to it. If possible position the ground
stake four or five paces away from the transmitter, and preferably at right angles to the probable route of the
target line.
Do not attach the ground lead to a water pipe or other buried line, which would then carry the transmitter signal.
Use the receiver passive mode to check that there are no lines buried between the ground stake and transmitter
as they could pick up the signal and confuse the locate survey.
Switch the transmitter on only after direct connection and ground connection have been made.
Adjusting the signal current level
• Select the required frequency
• Press the up and down arrows to select the required output.
The optimum output power level for a particular set of circumstances is best found by experience and trial and error.
Confirming a good connection
A tone change from the transmitter sounder indicates a good connection and that a strong signal has been
applied to the target line. The lower the tone the better the connection will be.
Check there is a change in tone by switching the transmitter on with the lead connected and disconnected. If
there is no tone change, try wetting the area around the bottom of the ground stake.
Transmitter clamps
Transmitter clamps are used to apply the transmitter signal to a cable or pipe without interrupting the supply and
with reduced coupling. The clamp is easy to apply but the signal may not travel as far as if it was applied by
direct connection. When using a clamp it is best if the target line
is grounded at each end.
It is not necessary to make a ground connection from the
transmitter when using a clamp but the line should be
grounded on each side of the clamp for the signal to
transfer to the line.
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