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TM30 User Manual v. X1.0
7.1.2 Tracing wires pairs at cable ends or joints
Task: A pair needs to be recognized at the end of an open cable or joint.
-
Connect transmitter to the traced pair.
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Choose
Open wires
mode with receiver and move receiver nose close to the
exposed wires.
-
Right pair gives the strongest signal. If the wires ends of the right pair are apart
enough from each other, a signal minimum can be detected between the wires.
7.2 Tracing underground cables and routes
7.2.1 Neutral electric cables and telecom cables
Task: The route of a neutral electric cable or telecom cable must be
traced above ground.
-
Connect one transmitter output terminal to one or more wires of the cable. Often
better tracing result is achieved if the same wires are grounded at the other end.
-
Connect transmitter second output terminal to a good grounding. If possible, use
ground pick and press it deep into damp soil for best earth connection.
-
Choose
Cable route
mode with receiver.
-
Trace the cable route by following the signal minimum in the receiver nose
direction.
-
To determine cable depth (h), turn the receiver to 45°
angle right above ground and trace until a second
minimum is found perpendicular to the cable route.
Cable depth is same as the distance (d) between the
two minimums, as shown in the figure.
