Triplett Fox 2 – PN: 3382 - Manual (Page 25)

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the target wire. If no change occurs, keep searching. This
will not work if a fake ground is being used. An actual ground
is required to activate TrueTrace.
An “Open Fault” may involve either one or both wires of a
telephone wire pair. Finding the open will only work if there
are no other faults (like a short to earth ground) in the pair.
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).
At the other end of the wires, connect one of the clips of the
FOX 2 to a good earth ground. Experimentally connect the
other clip of the FOX 2 to one wire and then the other, while
listening to the tracer tone on this clip with a HOUND or
HOUND 2. 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 a HOUND
or HOUND 2, follow the path of the wires by finding the stron-
gest signal. 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 or HOUND 2 from picking up the tracer signal, or