Triplett Fox 2 & Hound 3 – PN: 3399 - Manual (Page 48)

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Now, attach one of the clips and the wire attached to it to a
good earth ground. See Figure 11. The HOUND 3 should
pickup very little signal from the grounded wire. Move the
HOUND 3 along the length of the wire and note how a strong
signal is picked up on one side of the open fault, and very
little signal is picked up on the other side of the fault.
STRONG
SIGNAL
OPEN
TRACER TONE
VISUAL CONT.
TALK
OFF / POLARITY
AUDIBLE CONT. WARBLE PULSE
CORDLESS INTERFACE
UNLOCK BATTERY TEST
AC / RING
REV NORM
WEAK SIGNAL
GROUND
Figure 11