Triplett Hound 3 – PN: 3392 - Manual (Page 18)

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FOX TONE when you short out the wires. To make sure, leave
the short on the wire in question, and go back to FOX, and
test the alligator clips with the HOUND 3. If the TONE is still
there, you have not shorted the target wire.
Note: Even with the FOX’s alligator clips shorted out, the
case of the FOX unit will still radiate some TONE. Do not
confuse this with the TONE coming from the alligator clips.
Perform a few experiments by shorting out the clips and
probing the FOX with the HOUND 3 so you know what to
expect.
If using a FOX 2, the wires can be momentarily shorted to
active the True Trace feature. If this is the target pair, the
cadence of the tracer tone will change.