The
Discovery 3300
is a professional metal
detector. While the most
difficult aspects of metal detecting
have been automated, it is a
sophisticated electronic device which
requires an understanding of some basic
features and metal detecting concepts.
If you do not have prior experience with a
metal detector, we strongly recommend that you:
1) Adjust the Sensitivity to a low setting in the
event of false signals. Always begin use at a
reduced sensitivity level; use at full sensitivity
after you have become familiar with the detector.
2) Do not use indoors. This detector is for outdoor use only. Many
household appliances emit electromagnetic energy, which can
interfere with the detector. If conducting an indoor demonstration,
turn the sensitivity down and keep the searchcoil away from
appliances such as computers, televisions and microwave ovens.
If your detector beeps erratically, turn off appliances and lights,
especially those with dimmer switches.
MDISC33Rev.2020211
Also keep the searchcoil away from objects containing metal, such
as floors and walls.
3) Read this manual. Most importantly, review the Quick-Start Demo
(p.7-8) and Basic Operation (p. 9-12).
Use 9-volt ALKALINE batteries only. Do not use Heavy Duty Batteries.
The Discovery 3300 metal detector is warranted against defects in materials and
workmanship under normal use for five years from the date of purchase to the original owner.
Damage due to neglect, accidental damage, or misuse of this product is not covered under this warranty. Decisions regarding abuse or misuse of the detector
are made solely at the discretion of the manufacturer.
Proof of Purchase is required to make a claim under this warranty.
Liability under this Warranty is limited to replacing or repairing, at our option, the
metal detector returned, shipping cost prepaid to First Texas Products. Shipping
cost to First Texas Products is the responsibility of the consumer.
To return your detector for service, please first contact First Texas for a Return
Authorization (RA) Number. Reference the RAnumber on your package and
return the detector within 15 days of calling to:
First Texas Products L.L.C.
1465-H Henry Brennan Dr.
El Paso, TX 79936
Phone: 915-633-8354
NOTE TO CUSTOMERS OUTSIDE THE U.S.A.
This warranty may vary in other countries, check with your distributor for details.
According to FCC part 15.21 Changes or Modifications made to this device not expressly approved by
the party responsible for compliance could void the users authority to operate this equipment.
All rights reserved, including the right to reproduce this book, or parts thereof, in any form,
on to one target IDpresentat different angles
or detector emits• Highly oxidized
multiple tonestarget
• Sensitivity set • Reduce sensitivity
too high
No power, no• Dead batteries• Replace batteries
sounds
• Cord not connected •
Check connections
securely
Detector sounds • Ground Balance• Move Ground
continuous tone inover-adjustedBalance knob
Pinpoint Mode whencounter-clockwise
coil is lifted away
from ground.
Detector sounds con- • Detector needs to be • Press Pinpoint
tinuous tone with retuned• Re-ground balance
coil over ground
22
ELIMINATION
detector will not emit a tone, nor light up an indicator, when a
specified object passes through the coil’s detection field.
-
Reference to a metal being "eliminated" means that the
DISCRIMINATION - When the detector emits different tones for different
types of metals, and when the detector "eliminates" certain metals,
we refer to this as the detector "discriminating" among different
types of metals.
Discrimination is an important feature of professional metal
detectors. Discrimination allows the user to ignore trash and
otherwise undesirable objects.
NOTCH - Notching is the elimination of an item, or range of items, within
the metallic spectrum. We “notch-out” an object, or objects,
selectively. Objects to the left and right on the metallic spectrum
can be retained using the notch technique.
RELIC - A relic is an object of interest by reason of its age or its association
with the past. Many relics are made of iron, but can also be made
of bronze or precious metals.
IRON - Iron is a common, low-grade metal that is an undesirable target
in certain metal detecting applications. Examples of undesirable
iron objects are old cans, pipes, bolts, and nails.
Sometimes, the desired target is made of iron. Property markers,
for instance, contain iron. Valuable relics can also be composed of
iron; cannon balls, old armaments, and parts of old structures and
vehicles can also be composed of iron.
FERROUS - Metals which are made of, or contain, iron.
PINPOINTING - Pinpointing is the process of finding the exact location of a
buried object. Long-buried metals can appear exactly like the
surrounding soil, and can therefore be very hard to isolate from
the soil.
PULL-TABS -
bothersome trash items for treasure hunters. They come in many
different shapes and sizes. Pull-tabs can be eliminated from
detection, but some other valuable objects can have a magnetic
signature similar to pull-tabs, and will also be eliminated when
discriminating out pull-tabs.
Discarded pull-tabs from beverage containers are the most
GROUND BALANCE - Ground Balancing is the ability of the detector to
ignore, or "see through," the earth’s naturally occurring minerals,
and only sound a tone when a metal object is detected. The
Discovery 3300 incorporates proprietary Super-Scan™ circuitry to
eliminate false signals from severe ground conditions
3
ASSEMBLY
Lockin
g
Collar
S-Rod
Silver
Button
Searchcoil
Cable
IN THE FIELD TECHNIQUES
- Pinpoint Mode
Adjusting the Arm Rest
Most people will find the standard position
of the arm rest very comfortable. Very large
forearms and short forearms (particularly
children’s arms), can be accommodated
by moving the arm rest forward.
The arm rest is adjustable to three positions.
To adjust, remove the screw from the
underside, then press the silver button
and move the arm rest to one of the
alternate positions. If you cannot fully
depress the button with your finger, use
a narrow object, such as the blunt end
of a ballpoint pen. The arm rest must be
twisted with moderate force to move it
to an alternate position; this adjustment
is usually made infrequently.
If desired for added stability, re-install
the screw. The screw is not re-installed
in the furthest forward position.
If the button becomes disengaged inside
of the tube, remove the plastic cap at the
end of the tube to access the clip inside.
With a pair of needle-nose pliers,
reengage the button. Then replace the
plastic cap.
4
As your search takes you to different areas, verify the ground balance setting periodically using the above procedure. Within a geographical area, ground conditions can change. Varying elevation, proximity to water, and concentration of
rock, sand or clay can all affect ground condition and sometimes require recalibrating with the ground balance knob.
• If the detector remains silent with the searchcoil 1/2 inch over the ground, no
further adjustment is necessary; the detector is
In the Pinpoint Mode, coil sweep technique is not important. Rather, user
retuning is critical.
The detector does not automatically adjust to changing ground and environmental
conditions; the operator is required to make the adjustment. If the detector
sounds a constant tone over all areas of the ground, retune the detector by
pressing the PINPOINT button.
“GROUND BALANCED”
RETUNING
Keep the coil still, just above the ground surface, and press the PINPOINT button.
Make sure that the spot on the ground you chose for tuning did not contain
metal; pass over the area with the coil again to insure that the detector does
not emit a tone.
TEMPERATURE CHANGE
If the detector moves from one temperature environment to another, or if the
temperature changes, you must retune the detector until the temperature
stabilizes. If you move from a cooler to a warmer environment, the detector may
emit a constant tone; if so, retune. If you move from a warmer to cooler
environment, the detector may lose sensitivity; if so, retune.
PINPOINTING
Detection Field
The No-Motion’s detection field depends on the size of the target.
Large Objects
After detecting a target, lift the coil off the ground to a
distance where you hear the faintest tone. Move the
coil over the ground at this height. If the tone does not
fade, you have detected a large or irregularly shaped
object. Outline the object with slow coil movements.
If you can outline an area larger than the size of the inside coil,
you then have a large target, or several targets.
Large object can be detected when they enter the range of the outside coil.
Small Objects
After detecting a target, hold the searchcoil above the
ground, at a distance where you hear the faintest tone.
While maintaining the coil at this height above the
ground, move the coil from side-to-side. Note the spot
where the tone is loudest. Then move the coil toward
the ground to zero-in on the target’s location.
A coin-size object will be detected when the object enters the range of the inner coil.
21
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