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threshold adjusting threshold
Threshold is the constant background sound
produced by the detector to help distinguish
between desirable and undesirable targets.
When a rejected target is detected, the
Threshold sound ‘blanks’ (becomes silent) to
indicate that a rejected target is underneath
the coil.
If the Threshold is set to 0, the Threshold
audio/sound is disabled and detector
will produce target signals sounds only.
If the Threshold is set to a negative value,
small target signals will not produce a
signal big enough to go above the Threshold
of audibility.
If the Threshold is set to a positive value, high
enough for you to hear the faint hum, the
detector will produce target signals and a
Threshold sound. It is recommended that you
set a Threshold that is still very low; a high
Threshold can mask small target signals.
Press Menu/Select
and choose
Threshold
.
Use the + and – buttons to select a
suitable Threshold level.
Press Pinpoint/Detect
to return
to detection.
The tone of the Threshold can be
adjusted in Prospecting Mode only
(Threshold Tone, p. 38).
The Threshold volume should be set to the
preferred level. It is important to note that
small surface objects, as well as large deep
objects, will produce very small changes in the
Threshold sound. It is therefore important to
set the Threshold control correctly to ensure
that these targets are heard. Try experimenting
with known targets to assist in setting this
control.
Inaudible
Target #1
Target #2
Audible Target Response
Threshold
=
Volume
= 30
Target #1
Target #2
Audible Target Response
Threshold
=
Volume
= 30
Target #1
Target #2
Audible Target Response
Threshold
=
Volume
= 30
When Threshold and Volume settings are used together, there is
greater control over target audio response.
‘Blanking’ (No Sound)
Threshold
Threshold
Normal Signal
Speaker/Headphone Threshold
The X-Terra 705 is able to save separate
settings for both the speaker Threshold and
headphones Threshold, switching from one to
the other automatically as the headphones are
connected (Accessories, p. 52).
When the headphones are unplugged, all
changes to the Threshold setting are applied
to the speaker Threshold. When the
headphones are plugged in, the headphones
icon will be displayed and all changes to
the Threshold setting are applied to the
headphones Threshold.
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