Garrett ACE 350 User manual

© 2014 Garrett Electronics, Inc. PN 1533000.D.1214
1881 W. State Street
Garland, Texas 75042
Tel: [phone]
Email: [email protected]
Fax: [phone]
ACE 350 Owner’s Manual
Owner’s Manual
Ideally suited for locating
deeply buried relics, jewelry
and coins!

ACE 350™ 1
THANK YOU FOR CHOOSING
GARRETT METAL DETECTORS!
Congratulations on the purchase of your new Garrett
ACE 350™metal detector. This enhanced metal detector
has been specifically designed for use in more challenging
environments such as mineralized grounds and iron-cluttered
relic and coin hunting areas.
The ACE 350 includes Garrett's exclusive Target ID
technology and patented discrimination features. This
technology features two indicator scales that allow you to see
the detector’s discrimination setting (Lower Scale) as well as
the analysis of each detected target (Upper Scale). The ACE
350 also features Enhanced Iron Resolution™(additional
resolution for separating desirable targets from iron junk in
cluttered areas) and a standard 8.5" x 11" elliptical Double-D
searchcoil engineered for optimum performance in more
challenging mineralized soils.
Backed by more than 45 years of extensive research
and development, your Garrett ACE 350 metal detector is
the most advanced of its kind in the industry. Whether you
are experienced or a beginner, this machine is well suited
for a wide variety of your detecting environments. With One-
Touch™operation, the ACE 350 powers on with the touch
of a single button, adjusts easily for ground minerals and is
immediately ready to begin searching.
In order to take full advantage of the special features and
functions of the ACE 350, you are urged to carefully read this
instruction manual in its entirety.

2Garrett Metal Detectors

ACE 350™ 3
TABLE OF CONTENTS
ACE 350 Control Panel ........................................................... 4
Quick Start Guide.................................................................... 5
ACE 350 Components ............................................................ 6
List of Parts ............................................................................. 7
Detector Assembly .................................................................. 8
ACE 350 Display Elements...................................................10
Audio Features ......................................................................13
Pushbutton Controls .............................................................14
Setting Custom Modes (Discrim. Patterns) ............................19
Enhanced Iron Resolution ....................................................22
Bench Tests ...........................................................................24
Hunting Tips With Your ACE 350 Detector...........................27
Target Pinpointing Methods..................................................31
Troubleshooting Guide..........................................................35
Metal Detecting Code of Ethics............................................36
Cautions.................................................................................37
Caring For Your ACE 350 Detector.......................................38
ACE 350 Warranty / Service ................................................39
ACE 350 Accessories............................................................ 41
Suggested Reading...............................................................43

4Garrett Metal Detectors
ACE 350 CONTROL PANEL
Battery Level
Indicator
DISCRIM and Accept/
Reject Pushbuttons
Use DISCRIM (+) or (-) to select a
cursor. Then use (/X) button to set
its discrimination on or off.
SENSITIVITY
Pushbutton
increases or
decreases
sensitivity.
MODE
Pushbutton
selects detection
mode (i.e.
discrimination
pattern).
ON / OFF
Power
Coin Depth
Indicator
indicates depth of
coin-sized target.
Mode
Indicator
Target ID Legend
indicates metal types.
Lower Scale
indicates notch
discrimination pattern.
Target ID Cursor
indicates probable
target identity.
Sensitivity
Setting
PINPOINT
Pushbutton
allows static detection
to precisely locate the
object.

ACE 350™ 5
QUICK START GUIDE
1. Install batteries.
The ACE 350 operates with four (4) AA batteries which are
already installed by Garrett.
2. Power ON.
Press and release the ON / OFF Power button. The ACE 350
powers on in the last mode used, automatically adjusts for
ground minerals and is ready to search. (Factory default
mode is Coins.)
3. Select Mode.
Use the Mode Pushbutton to select a different detection
mode, when desired.
4. Adjust settings.
Adjust Sensitivity or Discrimination settings, if desired.
5. Begin scanning.
Lower the searchcoil to 1 to 2 inches above the ground and
scan the coil left and right at approximately 3 ft/second.

6Garrett Metal Detectors
ACE 350 COMPONENTS
Control
Housing
S-shaped
Stem
Upper
Stem
Lower
Stem
Search
coil
Handle
Grip
Padded
Arm Cuff
LCD
Screen
Detector
Stand
Pushbutton
Controls
Arm
strap
Spring
Clip

One (1) control housing with
S-shaped stem
One (1) upper stem and one
(1) lower stem connected
One (1) wing nut, two (2)
mounting washers and
one (1) threaded bolt
One (1) 8.5″x11″DD
searchcoil
Owner's manual
Warranty Card
ACE 350™ 7






LIST OF PARTS
No tools are required to assemble the ACE 350. Four (4) AA
batteries are included with the detector. The box for your
detector contains the following parts:
If any part is missing, please contact your local dealer.

DETECTOR ASSEMBLY
8Garrett Metal Detectors
1. Align the holes in the mounting washers with the
small posts on the lower stem and press firmly into
place.
2. Slide the searchcoil onto the stem.
3. Insert the threaded bolt through the holes of the
lower stem and searchcoil. Hand-tighten the
searchcoil assembly with the wing nut.
4. Depress the spring clip in the S-stem and insert the
control housing into the upper stem.
1. 2.
3. 4.

ACE 350™ 9
5. Depress the spring clip in the lower stem and adjust to
the most comfortable operating length.
6. Wrap the cable snugly about the stem with the
first turn of the cable over the stem.
7. Insert the cable connector into the connector of the
control housing and hand-tighten.
5. 6.
7. 8.
8. Adjust the arm cuff by removing the screw on the
bottom and moving it to the other hole.

10 Garrett Metal Detectors
ACE 350 DISPLAY ELEMENTS
The ACE 350 is designed with Garrett’s exclusive Graphic
Target ID technology, which indicates the probable
identification of a target along a horizontal scale that reads
from ferrous metals (e.g. iron) on the left to low conductivity
metals in the middle to high conductive metals (e.g. pure
silver) on the right.

Mode
Indicator

Target
ID Cursor
(Upper Scale)

Target ID
Legend

Discrimination
Pattern (Lower
Scale)

Battery
Level
Indicator

Coin Depth
Indicator

Sensitivity
Indicator

ACE 350™ 11
Mode—Indicates which of the five detection modes (Zero,
Jewelry, Custom, Relics or Coins) has been selected by
highlighting the corresponding word on the LCD screen.
Target ID Legend—Works in conjunction with the Target ID
Cursor to indicate a target's probable identity. Ferrous (iron)
targets will indicate on the left half, non-ferrous targets that
are thin or have low conductivity will indicate in the middle,
and thick or high conductivity targets will indicate at the right.
Target ID Cursor (Upper Scale)—The Target ID cursor, in
conjunction with the Target ID Legend, indicates the probable
identity of a detected target. The upper scale consists of
twelve (12) graphic segments for Target ID.
Lower Scale—The lower scale, or Notch Discrimination
Scale, indicates the discrimination pattern. The ACE 350 will
produce an audible target response for the pixels that are
switched on, and no audible response for those that have
been switched off. The Target ID Cursor will always indicate
all targets.
The discrimination pattern can be adjusted by changing
modes and/or using the DISCRIM and Accept/Reject (/X)
pushbuttons (see page 16).
Coin Depth Indicator—The depth of a coin, or similar sized
target, is indicated in 2-inch increments. Sweep over the
target with the searchcoil 1 inch from the soil to get the most
accurate reading. Note: targets larger than a coin may display
shallower than actual depth while targets smaller than a coin
may display deeper than actual depth.

12 Garrett Metal Detectors
Battery Level Indicator—Indicates the current battery
condition. The detector will maintain full performance until
the batteries need to be replaced. Replace batteries when
there is only 1 segment remaining. NiMH rechargeable
batteries may be used, but may have a shorter life per charge.
You can expect 20 to 40 hours of operation depending on
battery type and quality.
Access and replace the batteries by sliding the cover off
the control housing. Remove batteries when the ACE 350 will
be stored for longer than 30 days.
Note: 1.5v/cell Lithium batteries can also be used, but the
use of 3.7v/cell Lithium batteries will damage the detector.
 Sensitivity Indicator—The ACE 350 has eight (8) settings
for sensitivity. (See page 18 for information on when to adjust
your sensitivity settings.)

ACE 350™ 13
Headphone Jack—Any headphones with a 1/4” plug can be
inserted into the jack at the rear of the Control Housing.
AUDIO FEATURES
Tone ID—The Tone ID feature produces three distinct audible
tones based on a target’s metal type and conductivity:
• High conductivity targets (such as silver) produce a
unique belltone signal.
• Medium to low conductivity targets (such as jewelry or
small gold), produce a medium-pitched audio signal.
• Ferrous targets (such as iron and nails) produce
a low-pitch audio signal.

14 Garrett Metal Detectors
ON/OFF Power Pushbutton
Press and release to switch the unit ON and resume hunting
with the same settings used prior to turning the unit OFF. To
restore the factory settings, press and hold the power button
for 5 to 10 seconds (until the detector produces a fast double
beep).
MODE Pushbutton
Push the MODE button to select
one of five discrimination modes (Zero, Jewely, Custom,
Relics or Coins). See the next section ("Selecting Modes") for
details on each ACE 350 Mode.
PUSHBUTTON CONTROLS

ON/OFF
Power

MODE
Pushbutton

PINPOINT
Pushbutton

ACCEPT/
REJECT
Pushbutton

SENSITIVITY
Pushbutton

DISCRIM
Pushbutton

ACE 350™ 15
PINPOINT Pushbutton
Press and hold the Pinpoint
pushbutton to determine the exact location of a target.
To use the pinpoint function, position the searchcoil to the
side of the target's suspected location at a fixed height above
the ground (e.g. 1"). Press and hold the Pinpoint button and
sweep the searchcoil over the target area while maintaining
the same fixed height above the ground (e.g. 1"). Sweep
the searchcoil side-to-side and front-to-back in a crosshair
pattern to locate the peak signal. Note: it is important to
maintain a constant height during the entire Pinpointing
process to prevent ground mineralization from producing
false signals or masking the target's signal.
The bar graph on the LCD can also aid in locating a peak
signal. When pinpointing, the Upper Scale on the LCD Screen
indicates signal strength. When the greatest number of LCD
segments (increasing left to right on the scale) is shown, the
center of the searchcoil is directly over the target with the
depth of a coin-sized target shown on the depth scale.
With practice, you will be able to pinpoint objects quickly
and accurately.
DISCRIM Pushbutton
(Use in conjunction with the Accept/Reject pushbutton to
modify the discrimination pattern.)
Use the (+) or (-) DISCRIM pushbuttons to move the Target
ID cursor to the left or right. Next, use the Accept/Reject
pushbutton to modify the Lower Scale discrimination pattern.

16 Garrett Metal Detectors
Accept/Reject Pushbutton
(Use in conjunction with the DISCRIM
pushbuttons to modify the discrimination pattern.)
Press the Accept/Reject pushbutton to eliminate or activate
pixels located on the Lower Scale, directly below the Target
ID cursor.
As seen in the illustration below, the ACE 350 has 12 pixels
or "notches" of discrimination. Any combination of these
pixels can be switched on or off based upon your preference.
There are two primary methods for modifying the Notch
Discrmination Pattern to reject a specific type of trash or
unwanted item while detecting all other metal.
The example below illustrates how to manually use both
the DISCRIM and Accept/Reject pushbuttons to modify the
Notch Discrimination pattern.
Use the DISCRIM buttons to position the Target ID Cursor above the pixel you
wish to eliminate (see above illustration). Use the Accept/Reject pushbutton
(/X) to delete this pixel from the Lower Scale (see below). This item is now
rejected.

ACE 350™ 17
The second method of modifying the Notch Discrimination
pattern involves the use of only the Accept/Reject
pushbuttons. When an unwanted metal target is audibly
detected while hunting, simply push the Accept/Reject button
to create a notch where the Target ID Cursor has signaled the
presence of the trash. The next time the ACE 350 encounters
the same trash item, it will not produce an audible signal.
The ACE 350's Accept/Reject pushbutton (/X) can also
be used to find specific metal items. For example, if an
earring has been lost, scan the matching earring with the ACE
350 while in the ZERO mode. Note where the Target ID cursor
appears when the earring is scanned. Next, use the DISCRIM
and Accept/Reject pushbuttons to switch off all the pixels
except the one for the earring.
Note: Depending upon how the lost earring is laying in the
ground, its Target ID may shift a little; therefore, your ability
to find it will be enhanced by turning on an additional pixel
on either side. The ACE 350 is now programmed to find only
the missing earring based on the conductivity of its matching
pair.
Note: The accept/reject function can be used to modify
each Mode’s discrimination pattern. Notch Discrimination
modifications made while in CUSTOM mode will be retained
when the detector is turned OFF. However, all changes made
to the Notch Discrimination pattern while in ZERO, JEWELRY,
RELICS or COINS modes will return to the factory settings
when the detector is turned OFF and back ON again.

18 Garrett Metal Detectors
SENSITIVITY Pushbutton
Use the (+) or (-) SENSITIVITY buttons to step through the
eight (8) sensitivity levels, which are continuously shown on
the LCD screen.
Use higher sensitivity levels when searching for very
small or very deep targets. Use lower sensitivity levels in
locations where the detector is behaving erratically due to
excessive metallic trash, highly mineralized soils, saltwater
beaches, electrical interference or the presence of other
metal detectors.

ACE 350™ 19
SELECTING MODES (Discrimination Patterns)
The ACE 350 includes five Modes. Select the mode that
best suits the targets you hope to find or use the CUSTOM
Mode to create your own personal settings. In each mode,
minor changes in the preset discrimination patterns have
been programmed to optimize hunting for such typical
target(s).
This does not mean that the detector will search only for
jewelry while in JEWELRY Mode. It simply indicates that the
discrimination pattern is optimized for locating most jewelry
items. The JEWELRY Mode will still locate coins, relics and
other non-jewelry items.
• JEWELRY Mode
The discrimination pattern for this mode is designed
to find jewelry such as rings, bracelets, watches and
necklaces. Three pixels of ferrous targets have been
excluded to ignore most nails and small iron pieces.
Some iron pixels remain in order to minimize target
masking effects (see page 23 for more on target
masking).
The LCD screen in JEWELRY Mode will appear as:
In JEWELRY Mode, the lower 3 pixels are notched out.