Ground Balance; Automatic Ground Balance - Garrett AT Gold Owner's Manual

GrOuND BAlANCe

THRESHOLD
GND BAL
Pushbutton
Pushbutton
(use with GND BAL)
GND BAL Pushbutton—Hold for Automatic Ground Balance
or use in conjunction with the THreSHOlD pushbuttons for
Manual Ground Balance. The Ground Balance setting will be
retained when the detector is switched OFF.
As ground mineralization begins to increase, it has a
negative affect on detector performance. The greater the
amount of mineralization, the greater the loss of detection
depth and Target ID accuracy becomes. It is imperative to
ground balance the detector to maintain optimal performance.
The AT Gold can be ground balanced either automatically
or manually to cancel unwanted ground signals and obtain
maximum stability and target detection. By calibrating the AT
Gold's ground balance to the phase (measurement) of the
16 Garrett Metal Detectors
GND BAL
Indicator
(only displays
while in Ground
Balance mode)
GND BAL Setting
(only displays
while in Ground
Balance mode)
ground's signal, the result is deeper target detection, more
accurate Target ID, and more stable operation.
Note: Always locate an area of soil free of metal before
attempting to ground balance the detector.
Automatic Ground Balance—Press and hold the GND BAl
pushbutton while continually "bouncing" or "pumping" the
searchcoil from 1 to 8 inches (2 to 20 cm) above the ground.
When there is a minimal audio response from the ground,
release the pushbutton and begin hunting. The ground
balance value will have been indicated in the center of the
lCD. low ground balance values indicate conductive soil; high
ground balance values indicate ferrous soil.
Note: If the AT Gold's Ground Balance setting does not
change during the auto ground balancing process, the
detector is either sufficiently ground balanced already or the
current ground exhibits such neutral mineralization that the
settings will not change.
Manual Ground Balance—Press and release the GND BAl
pushbutton and continually bounce (pump) the searchcoil
from 1 to 8 inches (2 to 20 cm) above the ground. If low tones
are produced, increase the Ground Balance setting using
the (+) THreSHOlD pushbutton. If high tones are produced,
decrease the setting using the (-) THreSHOlD pushbutton.
Press and release the (+) or (-) THreSHOlD pushbuttons to
make single-step adjustments, or press and hold to make
large adjustments.
Continue bouncing the coil and making adjustments until a
minimum audio response is obtained, indicating the detector
is ground balanced. The Ground Balance setting will be
indicated on the lCD.
17
AT Gold ™