Triplett Fox 2 & Hound 3 – PN: 3399 - Manual (Page 21)

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The conductive plastic duckbill tip will not short out most
electrical circuits. The conductivity of the probe is very low
compared to the metal tip. Additionally, the slender duckbill
shape allows the tip to be inserted into wire bundles while
searching for the target wire. Most users prefer this tip, al-
though it is not quite a rugged as the solid metal tip.
7.5: Earphone Jack
The HOUND 3 has a Jack (GG) for connecting external Ear-
phones (Headphones). When using the external earphones,
the HOUND’s internal speaker is turned off. The earphones
are usually used when there is so much ambient noise that
the speaker cannot be heard, or when the sound of the
speaker may be annoying to others in the vicinity.
Helpful Hint:
Almost any type of earphones whose plug will fit into the
Earphone Jack will work. Some types will work better than
others. An earphone with shielded wires is recommended.
Use of earphones with unshielded wires may cause a squeal-
ing sound to be heard.
7.6: How it works
The HOUND 3 works by capacitively sensing the electrostatic
field radiated by wires carrying a signal from the FOX 2. The
greater the radiated field, the better the HOUND 3’s ability to
locate a wire. Anything that reduces the intensity of the field
will impair the HOUND 3’s effectiveness in locating a wire.
In general, several things affect field intensity . . . shielding,
signal (tone) amplitude on the wire, and wire dress. In in-
stances where a system is shielded (shielded wires, metal