User's Manual
16
Ground signals which are mainly derived from
magnetic iron oxides will be indicated with an in-
creasing audio response when lowering the search
coil to the ground although no metal is below the
search coil. This kind of ground indication can be
simply eliminated by simultaneously holding the
search coil at constant height over the ground and
pressing the
ZERO push button for a second. As
long as the coil is hold at the same height during
searching there will be no loss in sensitivity. When
expecting highly mineralized ground with false
indications in the DEL= DELAY modes however it is
always advisable to work with the built- in Ground
Balancing System (GBS) with the GROUND = GND
function turned on. Dierent GND functions can
be selected in order to cancel out signals from
magnetic soils or single stones with high iron oxide
contents. Even some iron objects can be discrimina-
ted/ eliminated by the way of the same functions.
The Sensitivity to ferrous metal objects is greatly
reduced in GND 1-5 modes.
For automatic ground balancing tuning purposes
please go on as follows: Hold the search coil hori-
zontally about 1 m to 2 m over the ground where
there is no metal. Press the
ZERO control for several
seconds and wait until the rst tuning process is
nished in the air. Lower the coil to the ground or
single magnetic stone and press the same
ZERO
control again for several seconds while keeping
the coil close to the ground. When pressing the
ZERO control the arrow on the display points up
and down in order to indicate the tuning process.
High and low beep sounds will also appear. Du-
ring that time no movements of the coil should be
done. Afterwards the detector is ready for use and
there should be no or only weak indications of the
ground when changing the distance between the
coil and the soil in GND 1-6. During operation it
might be necessary to retune the ground settings
from time to time.
8. AUTOMATIC GROUND BALANCING GND