Triplett Hound 3 – PN: 3392 - Manual (Page 23)

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If the pair is “live”, disconnect the pair from the incoming
telephone line before trying to locate the open. Short the
wires together at the far end and connect the shorted wires
to a good earth ground (a fake ground may not work well).
An extension wire may be used. At the other end of the wires,
connect one of the clips of the FOX or FOX 2 to a good earth
ground. Experimentally connect the other clip of the FOX or
FOX 2 to one wire and then the other, while listening to the
tracer tone on this clip with the HOUND 3. If the level of the
tracer tone drops significantly when the clip is connected to
one of the wires, this wire is probably OK and the other wire
is open. That is, the open wire is the one that doesn’t drop
the level of the tracer tone. If neither wire drops the level of
the tracer tone, they are probably both open (or a good
ground has not been used).
Leave the clip connected to the wire or wires that do not
“load down” the tracer tone. See Figure 5. Using the HOUND
3, follow the path of the wires by finding the strongest sig-
nal. An abrupt drop in the tracer tone level will occur at the
point of the open. Keep in mind, however, if tracing unseen
wires in the wall or ceiling, that the wires may pass behind a
metal object (like a furnace duct) that prevents the HOUND
3 from picking up the tracer signal, or the wires may diverge
from the path of the receiver. Before assuming that the open
has been located, try finding the signal nearby or in an adja-
cent attached wall or ceiling. Also keep in mind that it may
not be possible to find the open in all situations, because of
the number of variables involved.