Lateral Mode - Fisher TW-82P Operating Manual

TW-82P RECEIVER

LATERAL MODE

At some sites, utility lines branching off from a main line may be
difficult to trace using the Standard Mode. In
these circumstances, use the Lateral Mode.
At such sites, the signal from a main
line is so strong that it overwhelms
the single from a lateral line. In
this illustration, gas service
lines connecting to homes
from a main gas line may
carry far less current than
the main line. This weaker
current could be the result
of a lateral line that is
shorter than the main line,
or a lateral that is not well
grounded.
When conducting a trace of the Lateral line, select LATERAL Mode
and walk parallel to the main line (as in the illustration below). You
must use Lateral Mode in this situation because in the Regular Mode,
you may detect the signal from the main line all of the way up to the
house, even with the blade of the Receiver parallel to the main line.
The Lateral Mode is
configured to ignore the
signal coming from the
parallel main line and
detect signals coming
from the perpendicular
lateral lines.The Lateral
Mode may still detect
the main line in very
close proximity, even
though the
blade is parallel to it. So
maintain a minimum
distance of 6 to 12 feet
from the main line when
tracing lateral lines.
Walk parallel to the
main line, holding the
blade of the Receiver
perpendicular
lateral lines.
12
Receiver
to the
LATERAL LINE
Blade is
perpendicular
to lateral line
LATERAL LINE