24 Garrett Metal Detectors
AT Gold
™
25
• ALL METAL Mode Overview
Designed to detect all types of metal. All 12 discrimination
pixels are switched on and High-res Iron Discrimination
is disabled (--), indicating that no metal targets have been
eliminated.
The All Metal Mode is preferred for prospecting and deep
searches because it provides the greatest possible depth
and sensitivity. It also provides a continuous audio response
to allow the operator to hear the subtle detection signals
produced by faint targets.
While in All MeTAl Mode, the
AT Gold
will respond to
the entire range of conductive and magnetic properties
encountered, including ground responses. The user is
continuously hearing what the searchcoil is "seeing" in
the ground. Therefore, it is essential to be properly ground
balanced while operating in the All MeTAl Mode. Naturally
occurring minerals in the soil must be canceled out during the
ground balance procedure in order to detect only the signals
from metal objects in the ground.
The All MeTAl Mode provides complete target information,
including a Target ID pixel on the upper scale, Digital Target
ID, and depth reading. The
AT Gold
thus allows the operator
All MeTAl MODe
to remain in the All MeTAl Mode at all times, in contrast
to some detectors which require the operator to switch to a
Discrimination mode to obtain Target ID. Be aware that some
deeper targets (faint audible signals) may exceed the reach of
Target ID.
• Audio Characteristics of ALL METAL Mode
Because the All MeTAl Mode permits no discrimination,
the detector will give an audible signal to indicate every piece
of metal it scans over. Target responses will normally be heard
as a proportional Medium Tone. However, the
AT Gold
is a
unique All Metal detector in that its Iron Discrimination and
Iron Audio™ features can be used to hear if detected targets
are ferrous, as indicated by a low tone. Iron Discrimination
levels can only be adjusted in the All MeTAl Mode if the Iron
Audio feature is on and these changes will
not
be retained
when the detector is switched off.
(See Iron Audio section,
pages 30–33.)
Gold prospectors and many relic hunters rely primarily
on their ears to discern good target signals. These desired
signals are presented as clean, repeatable responses that
override the constant background hum.
