Triplett Fox & Hound 3 – PN: 3397 - Manual (Page 48)

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In some situations, the HOUND 3 may have a tendency to
“feedback” at high Sensitivity settings. The feedback may
sound like a howling or squealing sound coming from the
Speaker. To suppress this effect, the Sensitivity setting can
be reduced, or the user may find that touching an ungloved
finger to the earphone jack may help.
8.2.5: LED Lights
The white LED Lights (CC) provide light for performing tests
in poorly lit areas. The LEDs do not interfere with the target
signal. If fluorescent lighting is causing a lot of interference
with the target signal, the user may find it helpful to turn off
the lighting temporarily, and use the non-interfering illumi-
nation provided by the LEDs.
8.2.6: Conductive Plastic(AA) & Metal Probes(BB)
Two probes are provided with the HOUND 3. They are easily
changed by screwing and un-screwing them from the tip of
the HOUND 3.
The metal conical probe is rugged and durable. If working
with low voltage wiring, the metal probe can provide a sig-
nificant increase in signal loudness when the metal in the
target wire, or a metal contact connected to the target wire,
is touched. This sometimes aids in identifying the target wire.
For example, the metal probe is often used to drag along the
contacts on a telephone punchdown block. In situations
where the metal probe may short a circuit, leading to dis-
ruption of the circuit operation, or may short a power cir-
cuit, possibly causing equipment damage and user injury,