Full Product Manual

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 diers 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 betwee
n 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