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WARNING
Do not hold the receiver at an angle – Incorrect information will result!
1 . To determine the direction of the conductor, stop and vertically rotate the receiver to the left
and right. The highest signal strength reading indicates the direction of the conductor.
Continue to trace the conductor in the direction indicated by the indicators on the receiver. If
the signal strength drops abruptly, the conductor may have changed direction or stopped.
2 . When you have pinpointed the conductor's location, mark it as required. See Section 5.6 for
APWA color markings.
3 .
When you have finished the locating, turn the transmitter and receiver off and disconnect the
accessories.
5.3
Inductive Coupling with the 4820 Metroclamp
Use this method if Direct Connection is not possible, but you can position a Metroclamp around
the conductor you want to trace. The Inductive Coupling method uses the 4820 Metroclamp to
induce a signal onto the conductor when direct metallic contact is not possible. The clamp is
placed around the target conductor. The transmitter then induces a signal through the clamp.
When using the Metroclamp the conductor must be well grounded, i.e. with sheaths and neutrals.
When tracing lines that have insulators, the insulators should be bypassed, using the supplied
jumper cable.
1. With the transmitter OFF, plug the 4820 Metroclamp cable into the COND/AUX jack on the
VM-480B transmitter.
2. Place the Metroclamp around the conductor, below the electrical ground. Make sure that the
clamp jaws are completely closed.
Inductive Coupling with the Metroclamp
3. Continue your locating by following steps 4 through 11, Section 5.2 Direct Connection.
5.4
Inductive (Indirect Method)
If you cannot make a direct connection onto the conductor, or use the Metroclamp, use the
antenna that is mounted on the transmitter case to induce signal onto the conductor.
1 Insulator
2 Pipe
Couplers must be placed below
the electrical ground.
5 Operation
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