Triplett Fox & Hound 3 – PN: 3397 - Manual (Page 38)

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ably the target wire. If the signal is not completely killed, the
wrong wire has been selected, or there is an open fault in
the wire, and crosstalk is being picked up from the other
wires. (This will not work if a fake ground is being used. An
actual ground is required to perform this test).
8.1.4.6: Resistance Heating Wires:
The FOX and a HOUND 3 can be used to trace the path of a
resistance heating wire in a plaster wall or ceiling. This is
usually performed to find an open in the wire. It is best if the
user is familiar with resistance heating techniques, particu-
larly in regard to the typical patterns used for the wire path.
The wire is usually in a serpentine pattern, with the wire spac-
ing and orientation varying depending on the amount of heat
needed in different areas of the room.
Finding the open can be a challenge. Several techniques can
be, and should be, used.
It helps if the user performs a few experiments before trying
to find the open. See Figure 7. Attach a few pieces of wire
(any kind) more than several feet long to each clip of the
FOX. Lay the wires out on a non-conducting surface (a wood
floor with no metal in the vicinity..... nails are OK, but make
sure there’s no metal furnace duct below the floor) parallel
to each other, about 4 “ apart. Using a HOUND 3, trace along
one of the wires, in normal fashion, noting how the tracer
tone becomes stronger as the wire is approached. Now trace
along the other wire, noting that it behaves just like the pre-
vious wire. Now, slowing move the HOUND 3 from one wire