Triplett Fox 2 & Hound 3 – PN: 3399 - Manual (Page 46)

46
like the previous wire. Now, slowing move the HOUND 3 from
one wire to the other wire. Notice that at approximately the
midpoint between the wires, the tracer tone becomes very
weak. This is the “null point” . . . the place where the signal
from one wire cancels the signal from the other wire. Notice
how this null differs from simple loss of signal . . . that is,
there’s a very narrow zone where the null occurs, and the
signal gets stronger quite rapidly on either side of the null.
By waving the HOUND 3 back and forth while slowly moving
along the length of the wire, the path of the null point can be
followed between the wires. These wires can be thought of
as being on either side of the open fault . . . so by using this
technique, it will be possible to localize the area in which the
fault occurs.
TRACER TONE
VISUAL CONT. TALK
OFF / POLARITY
AUDIBLE CONT. WARBLE PULSE
CORDLESS INTERFACE
UNLOCK BATTERY TEST
AC / RING
REV NORM
STRONG
SIGNAL
NULL
SIGNAL
FADES
Figure 9
Reposition the test wires so that they are inline with each
other, with a small gap between them (1/16" to 1/8"). See
Figure 10. Again, trace along the length of the wire and note