Threshold Adjustment; Search Modes Overview - Garrett AT Gold Owner's Manual

THreSHOlD ADJuSTMeNT

Threshold is the constant background "hum" that is added
to the target response. Press a Threshold button once to display
the current setting. Press the (+) or (–) Threshold buttons again
to select from 33 levels, ranging from -9 up to +23.
Positive Threshold values add an audible background hum
to the target response (i.e. positive audio bias), while negative
values subtract audio from the target response (i.e. negative
audio bias). A Threshold of zero adds no audio bias.
Select a Threshold setting based on personal preference.
However, to maximize the ability to hear faint signals, it is
recommended to operate with a faint, yet barely audible
threshold (i.e. faint positive audio bias). The louder the
surrounding environment, the higher you may need to set
the Threshold. Conversely, there may be times you wish to
operate with a negative or silent threshold, for example, in
order to reduce detector chatter, etc.
Headphones are also highly recommended to maximize the
ability to hear faint signals, particularly in noisy environments.
22 Garrett Metal Detectors
THRESHOLD
Setting
(only displays
when
THRESHOLD
buttons are pressed)
THRESHOLD
Adjust
Pushbuttons

SeArCH MODeS OVerVIeW

The AT Gold includes three detection modes: a true All
Metal Mode and two Discrimination Modes.
Press the Mode button to scroll through the three modes:
All MeTAl, DISC 1 and DISC 2.
In general, the All Metal Mode is preferred for prospecting
because it provides the greatest detection depth and
sensitivity. The All Metal Mode also offers a continuous audio
response to allow the operator to hear the subtle detection
signals produced by faint targets. The All Metal Mode contains
no discrimination, thus all types of metal will be detected.
In either of the two Discrimination Modes, the AT Gold
provides more Tone ID information in addition to the ability
to discriminate unwanted trash targets (e.g. nails, foil, pull
tabs). The two Discrimination Modes, by their nature, are less
sensitive to small and deep targets than the All Metal Mode.
The All Metal Mode is ideal to use for maximum detection
depth in areas that are not overly trashy or where there is
no desire to eliminate any type of metal. The Discrimination
Modes are usually desired in trashy areas for the elimination
of some trash targets. The Discrimination Modes will provide
quieter, more stable operation, but will not detect as deeply
as the All Metal Mode.
In either of the three modes, the AT Gold's searchcoil
must be in motion to detect targets. Truly static detection is
possible while using the detector's Pinpoint pushbutton.
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AT Gold ™