Threshold Level - Minelab EQUINOX 600 Instruction Manual

Contents

Threshold Level

Threshold is the constant background sound that can be produced by the detector.
Threshold is a useful setting for distinguishing between desirable
and undesirable targets, as well as hearing faint gold nugget signal
responses.
The Threshold Level setting has a range from 0 to 25 with a default
setting of 0 (off ) for Park, Field, and Beach Modes, and a default setting
of 12 for Gold Mode*.
Threshold Level changes are semi-global; Park, Field, and
Beach Mode Search Profiles will be affected by changes to this
setting when in any of these modes.
Gold Mode* Threshold Level is controlled separately to the other modes.
Adjusting the Threshold Level
The Threshold Level Setting for all Detect Modes is adjusted in the
same way.
1. Use the Settings button to navigate to the Threshold Level
setting in the Settings Menu.
2. Press the Minus (–) or Plus (+) buttons to adjust the Threshold
Level. Adjustment takes effect immediately, so listen to the
audio to select your preferred level.
With the EQUINOX 800, the pitch of the Threshold tone can be
set higher or lower via the Threshold Pitch Advanced Setting
(page 45).
Gold Threshold
The Threshold for Gold Mode is a 'true' threshold tone that can be adjusted to improve the audibility of faint signals from small gold
nuggets. Unlike a 'reference' Threshold, 'true' Threshold allows gold nugget signals to be emphasised in typically mineralised 'noisy'
goldfield soils. Greater control of the target audio response may be achieved by adjusting the Threshold and Volume settings together.
Audio range that
you are able to hear
Threshold Level
Quiet signal
Too Low
now inaudible
If the Threshold Level is too low, the slight variation caused
by a small or deep target may not be sufficient to hear.
Adjusting the level to below an audible level will ensure
silent operation but could mask the audio response from
small or deep targets.
Audio range that
you are able to hear
Threshold Level
Just Right
Loud signal
Adjust the Threshold Level to a faint audible hum. This
will emphasise variations in signal response which may
indicate the presence of a target. If the soil conditions
change, the Threshold Level may need further adjustment.
Threshold Blanking
When a rejected target is
detected, the Threshold tone
'blanks' (becomes silent) to
indicate that a rejected target is
underneath the coil.
If the Threshold is set to 0, you
will not hear the blanking of
the rejected targets.
Park, Field, and Beach Threshold
Park, Field, and Beach Modes use a simplified type of threshold
tone, i.e. a 'reference' threshold. It is a continuous background
tone that will blank when a rejected target is detected. Without a
reference threshold, a rejected target detection would be silent,
and you would not be made aware of the target's existence.
For typical treasure detecting locations where there is often a large
amount of trash in the ground, constant audio blanking may be
disruptive.
Minelab recommends using a Threshold Level setting of 0 (off ) for
Park, Field and Beach applications, unless you want to hear audio
blanking.
Threshold Level
Audio range that
you are able to hear
Quiet Very loud
signal signal
Too High
If the Threshold Level is too high, faint targets will be harder
to hear above the Threshold hum.
Threshold Level | 44
Detection (Audio signal)
Threshold tone
Accepted
target
Blanking (No Sound)
Threshold tone
Rejected
target
Quiet signal Loud signal
masked just audible