Threshold; Adjusting Threshold - Minelab X-Terra 70 Quick Start & Reference Manual

THRESHOLD

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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.
Normal Signal
Threshold
'Blanking' (No Sound)
Threshold
Speaker/Headphone Threshold
The X-Terra 70 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, pg. 50).
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.
The tone of the Threshold can be
adjusted in Prospecting Mode only
(Threshold Tone, pg. 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.
Press and choose
MENU SELECT
Threshold.
+ –
Use the and buttons to select a
suitable Threshold level.
Press , to return to
PINPOINT DETECT
detection.
Audible Target Response
Volume
= 30
Target #2
Inaudible
Target #1
Threshold
=
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.
Audible Target Response
Volume
= 30
Target #2
Target #1
Threshold
=
If the Threshold is set to 0, the Threshold
audio/sound is disabled and detector will
produce target signals sounds only.
When Threshold and Volume settings are used together,
there is greater control over target audio response.

ADJUSTING THRESHOLD

Audible Target Response
Volume
= 30
Target #2
Target #1
Threshold
=
If the Threshold is set to a positive value,
the detector will produce target signals
and a Threshold sound.
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