Basic Operation; Sensitivity Adjustment - Bounty Hunter Challenger Owner's Manual

OPERATION
The Challenger is a MOTION metal detector; the search coil must be in
motion over the targeted object in order for the machine to detect the object
and emit a tone. Motion is required in order for the detector to
automatically GROUND BALANCE. All soil and sand is different, containing
varying amounts of naturally occurring minerals. As you sweep the search
coil over the ground, your metal detector is constantly READING and
AVERAGING the ground's mineralization, in order to differentiate between
the naturally occurring ground minerals and a metal target.
Household appliances, lighting fixtures, outdoor power lines (overhead
and buried) all emit electromagnetic fields. Electromagnetic energy also
occurs naturally in the environment. Your metal detector creates its own
magnetic field; so you need to adjust your SENSITIVITY to
compensate for any interference.
The sensitivity control is also useful in discerning
objects at different depths. Multiple tone
response over one targeted area
could indicate multiple objects.
Reducing sensitivity allows
you to target only the
shallower object.
8
Adjust the SENSITIVITY
After powering the unit on, turn the left
knob, SENSITIVITY, 90% clockwise. If
the detector chatters or emits erratic
sounds, reduce the sensitivity by turning
the knob to the left. The detector will
work well at the 2:00 or 3:00 position.
This adjustment is necessary due to
possible electromagnetic interference.
Detection field
only covers
shallow objects