4-18
4.1.2.3 Inductive signal coupling
Inductive signal coupling For lines which are not easily accessible, the signal from the transmitter has to be
inductively coupled via the integrated antenna.
The inductive coupling of the signal is highly recommended if unknown lines are to
be located (e.g. at a construction site).
To determine the orientation of a specific line, the transmitter has to be positioned
directly above the presumed line as shown in the following illustration. In doing so,
the best signal coupling is achieved when the handle of the transmitter housing is
aligned with the presumed lay of the line.
When locating lines using inductive signal coupling, the following guidelines should
be observed:
•
As the signal can be coupled onto other conductors when using inductive
coupling, direct coupling of the transmitter is always preferable when locating
lines selectively. Inductive signal coupling should only be opted for in cases
where the line being located is not easily accessible (see section
and section
4.1.2.2 Coupling using special
•
While taking measurements, make sure that a distance of at least 15 m is
always maintained between the receiver and transmitter in order to prevent the
coupling of the transmitter's signal through the air.
•
When searching for unknown lines at a site, the position of the transmitter has to
be changed at least once by one metre and 90°.
•
It is also a good idea to position the transmitter at visible cable ends such as at
distribution boxes or light poles.
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