HT instruments HT5000 - Manual (Page 12)

HT-5000
EN - 11
4.2.2.3 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 Fig. 7. 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
Fig. 7:Inductive signal coupling
CAUTION
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
paragraph 4.2.1 and 4.2.2)
• While taking measurements, make sure that a distance of at least 15m 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