11
14
OPERATION and CONTROLS
cont.
MENU SELECTIONS
1. SENSITIVITY
Use
and
to increase or decrease sensitivity while the SENSITIVITY
line is highlighted.
Maximum sensitivity setting is 99.
Minimum sensitivity setting is 05.
If the detector beeps erratically or beeps when there are no metal objects
being detected, reduce the sensitivity.
The searchcoil produces a magnetic field and then detects changes in that
magnetic field caused by the presence of metal objects. This magnetic field
that the detector creates is also susceptible to the electromagnetic energy
produced by other electronic devices. Power lines, microwave ovens, lighting
fixtures, TVs, computers, motors, etc…. all produce EMI which can interfere
with the detector and cause it to beep when no metal is present, and
sometimes to beep erratically.
Notice that the sensitivity settings behave differently above 90. From 05 to 90,
gain is changing. Above 90, the threshold level changes. Setting above 94 will
be noisy or sound erratic.
HOW DEEP WILL IT GO?
The Gamma 6000 Metal Detector will detect a coin-sized object, like a quarter,
to a distance of about 11” (28cm) from the searchcoil at maximum sensitivity.
Large metal objects can be detected to a depth of several feet. Detectability
is directly related to the size of the metal object -- the larger the object, the
deeper it can be detected.
Accuracy of target identification is also related to distance from the coil.
Beyond a distance of 8”, the accuracy of target identification begins to
diminish.
All modes share the same sensitivity setting. If sensitivity is adjusted in any
mode, the change is also effective for the other modes.
OPERATION and CONTROLS
cont.
MENU SELECTIONS
continued
4. # OF TONES
While the # OF TONES line is highlighted, use
and
to program the
number of different audio tones.
Different target categories are identified by different audio tones in order to give
you the fastest real-time reference while searching. Most experienced users
become familiar with the tones and search without always looking at the display.
Use this selection to program the number of audible tones the detector
will emit.
The default setting is 3 tones.
Depending on your number of tones selection, audio target categories are:.
# Tones Iron Foil
Nickel
PullTab SCAP
Zinc
Dime Qtr+
1 *VCO VCO
VCO
VCO
VCO
VCO
VCO VCO
2
Bass VCO
VCO
VCO
VCO
VCO
VCO VCO
3
Bass Low
Low
Low
Low
Low
High High
4
Bass Low
Medium Low
Low
Low
High High
*VCO (originally referred to as Voltage Control Oscillator)
Pitch increases with increasing signal strength. A given target will
induce a HIGH PITCH when close to the coil, but a LOWER PITCH
when farther away.
The audio volume always varies in proportion to signal strength. The
closer a target gets to the coil, the louder the volume.
5. VOLUME
While the VOLUME line is highlighted, use
and
to change the
speaker volume.
The default volume setting is 10. Maximum is 10.
Minimum is 0 (volume off). At levels 1, 2 and 3, high tones will be inaudible or
barely audible.
The speaker volume will diminish as battery voltage drops. For maximum
speaker volume, use 1 or 2 tones, as the low and bass tones generate the
loudest sounds.
Volume can be set while in either the DISCRIMINATION or ALL METALS
modes, but only one setting applies to both modes. Volume in the two modes
cannot be set independently.
