Triplett Fox 2 & Hound 3 – PN: 3399 - Manual (Page 59)

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HOUND 3’s probe. When the plug is inserted into the jack,
the HOUND 3’s speaker is turned off, and the sound can only
be heard through the earphone.
To use the earphone, set the HOUND 3’s Sensitivity Control
to minimum, plug the earphone into jack, and press the
Power button. Adjust the Control for a comfortable sound
level in the earphone.
Helpful Hint
Setting the Sensitivity Control to minimum prior to using
the earphone, as previously described, can often save the
user from a jarring experience. Sounds that are not very
loud in the Speaker, can be very loud in the earphone. While
the HOUND 3 does provide some compensation for this, the
earphone loudness can varying greatly depending on the
earphones actually used.
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 provide by the LEDs.