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Garrett AT Pro INTERNATIONAL, Owner'S Manual

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16 Garrett Metal Detectors

AT Pro International™  17

Adjacent targets

Adjacent Targets Comparison: Standard vs Pro Mode

These two adjacent coins would produce one strong signal while in STD Mode. 

In PRO Mode, the proportional audio provides two peaks of audio response to 

allow the user to identify multiple targets.

Shallow coin

Audio Target Response Comparison: Standard vs Pro Mode

Notice the differences in Standard binary audio versus PRO audio in the two 

target scenarios above. The binary audio gives a solid, consistent beep for 

both the shallow and the deep coin. In contrast, PRO Mode's proportional 

audio provides a stronger signal for the shallow coin and a softer signal for 

the deeper coin. The actual profile, or signature, of the target’s response is 

heard, thereby providing more information.

Deep coin

Summary of Contents for AT Pro INTERNATIONAL

Page 1: ...2 1881 W State Street Garland Texas 75042 Tel 1 972 494 6151 Email sales garrett com Fax 1 972 494 1881 AT PRO INTERNATIONAL Owner s Manual Owner s Manual TM The powerful all terrain solution for locating deeply buried European coins and artefacts ...

Page 2: ... in cluttered areas several advanced audio features and a standard 28x22cm elliptical Double D searchcoil engineered for optimum performance in Europe s more challenging mineralised soils In addition the AT Pro can be operated in a very user friendly Standard STD Mode or in a more advanced PRO Mode for experienced hunters Backed by more than 45 years of extensive research and development your Garr...

Page 3: ...N 19 DIGITAL TARGET ID 20 TONE ID 21 DISCRIMINATION 22 Notch Discrimination 22 Iron Discrimination 24 IRON AUDIO 27 SENSITIVITY 30 GROUND BALANCE 31 Automatic Ground Balance 31 Manual Ground Balance 32 FREQUENCY ADJUSTMENT 33 PINPOINTING 34 Narrowing the Detection Area 36 Coin Depth Indicator 36 Alternative Pinpointing Methods 37 HUNTING TIPS 39 BENCH TESTS 44 UNDERWATER OPERATION 47 CARE AND MAIN...

Page 4: ...crimination on or off SENSITIVITY Pushbutton increases or decreases sensitivity ON OFF Power hold 1 second to turn power on off MODE push quickly to toggle between detection modes RESET hold 5 seconds to restore factory settings Coin Depth Indicator indicates depth of coin sized target Mode Indicator Target ID Legend indicates metal types Lower Scale indicates notch discrimination pattern Target I...

Page 5: ... 6 Garrett Metal Detectors AT Pro International 7 AT Pro 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 LIST OF PARTS No tools are required to assemble the AT Pro Four 4 AA batteries are included with the detector The box for your detector contains the following parts If any part is miss...

Page 6: ...ress the spring clip in the S stem containing control housing and insert S stem through the upper camlock collar into the upper stem 8 The spring clip must be engaged in the FIRST stem opening in order to maintain battery compartment access Hand tighten the camlock collar Do not overtighten 9 Depress the spring clip in the lower stem and adjust to the most comfortable operating length Hand tighten...

Page 7: ...t the arm cuff by removing the screw on the bottom Move the two piece cuff to the other hole reinsert the screw through the headphone cable clip and tighten 12 13 If desired attach headphones to the 2 pin connector of the Control Housing After lining up the connector pins press the connector in firmly yet carefully until the O ring is felt to be fully inserted 14 Secure the headphone cable under t...

Page 8: ... size and depth via the Proportional Audio and conductivity changes via Tone Roll Audio Pro Mode also offers faster recovery speed for separating adjacent targets The advanced audio features of Pro Mode are intended for more skilled users who wish to hear the true signature of targets versus the simpler target response provided in STD Mode ZERO Mode Designed to detect every type of metal use ZERO ...

Page 9: ...C and NOTCH DISC see pages 22 26 PRO DETECTION MODES Zero Coins or Custom have the same discrimination patterns as in STD Mode In PRO Mode however the AT Pro utilizes its Pro Audio functions including Proportional Audio and Tone Roll Audio to offer more target information The Pro Mode audio provides more target information and faster recovery speed for separating adjacent targets This is especiall...

Page 10: ...e targets Shallow coin Audio Target Response Comparison Standard vs Pro Mode Notice the differences in Standard binary audio versus PRO audio in the two target scenarios above The binary audio gives a solid consistent beep for both the shallow and the deep coin In contrast PRO Mode s proportional audio provides a stronger signal for the shallow coin and a softer signal for the deeper coin The actu...

Page 11: ...ill produce a distinctive response of Low High Low as compared to the coin s response of only High tone Tone ID Comparison Standard vs Pro Mode TARGET ID INFORMATION Target ID Cursor Upper Scale Target ID Legend Discrimination Pattern Lower Scale 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 h...

Page 12: ... page provides Digital Target ID ranges of some commonly found items It is important to note that while operating in the PRO Mode the Pro Audio depth can exceed Target ID depth i e faint targets at depth can be heard without providing any Target ID Note Target values can vary based on the orientation of the target in the ground amount of ground mineralization etc It is important to practice in the...

Page 13: ...CH DISC Pushbutton Use the NOTCH DISC buttons to position the Target ID Cursor above the pixel you wish to eliminate see above illustration Use the ELIM pushbutton to delete this pixel from the Lower Scale see below This item is now rejected Example Manual Modification of Notch Discrimination Pattern The second method of modifying the Notch Discrimination pattern involves the use of only the ELIM ...

Page 14: ... Setting IRON DISC Pushbutton Use the or IRON DISC pushbuttons to adjust the Iron Discrimination up or down The small two digit number above the words IRON DISC on the LCD indicates the iron discrimination setting Iron targets such as the nail shown in Illustration 1 can sometimes mask a good target s signal If too much iron discrimination is applied the good target seen in Illustration 2 can be m...

Page 15: ...ple Detecting Targets in Trash with High Res Iron Discrimination IRON AUDIO IRON AUDIO Pushbutton Iron Audio ON Press and release the IRON AUDIO pushbutton to switch the Iron Audio feature ON OFF When this feature is on the words IRON AUDIO appear on the LCD as shown in the illustration above The Iron Audio feature can be used in any of the AT Pro s six modes Scattered iron objects in the ground c...

Page 16: ...igh concentrations of iron it is recommended to switch off Iron Audio Otherwise it may produce far too many signals Then if a target is detected that has a questionable or inconsistent response switch on Iron Audio to check if it is iron To fully appreciate the additional information offered by the Iron Audio feature conduct the following experiment Start with the AT Pro in Standard STD Zero Mode ...

Page 17: ...ncing or pumping the searchcoil from 2 to 20 centimeters above the ground When there is a minimal audio response from the ground release the pushbutton and begin hunting The ground balance value will have been indicated in the center of the LCD Low ground GND BAL Indicator only displays on LCD when in use GND BAL Setting only displays while in Ground Balance mode The AT Pro has eight 8 settings fo...

Page 18: ...CD Press and release the GND BAL pushbutton again to exit Manual Ground Balance mode The Ground Balance setting will be retained when the detector is switched OFF Typical Ground Balance Ranges 80 99 Highly ferrous magnetite ferrous oxide minerals black sands hot rocks terra cotta 60 80 Moderately mineralized soils red clay brown clay iron bearing clay minerals etc 20 60 Likely an iron object 0 20 ...

Page 19: ...ng the 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 are shown the center of the searchcoil is directly over the target with the depth of a coin sized target shown on the depth scale The symbol PP for pinpoint is displayed on the LCD while pinpointing It is recommended to practice pinpointi...

Page 20: ...s Note targets larger than a coin may display shallower than actual depth while targets smaller than a coin may display deeper than actual depth Alternative pinpointing technique DD tip or tail In the standard pinpointing method described on pages 34 the target is pinpointed beneath the center of the searchcoil Some detectorists using DD coils prefer to pinpoint off the tip or tail of the searchco...

Page 21: ... left to right position of the target Then locate the target s front to back position by rotating around 90 and repeating the same process Tip Practice any or all of these various pinpointing options in your test plot Choose the technique that works best for you As you improve your pinpointing accuracy you will dig smaller holes and increase your productive hunting time Begin hunting in STD Mode t...

Page 22: ...archcoil at the end of each sweep Tips for saltwater use Hunting in a saltwater environment is challenging for any Continous Wave VLF metal detector Saltwater is conductive and produces signals similar to foil Although the AT Pro is not specifically designed for saltwater use it can be used in this environment Proper ground balance is the most important step for stable saltwater operation To achie...

Page 23: ...use the NOTCH DISC pushbutton to manually reduce the ground balance setting For example if the Ground Balance number was 11 reduce the Ground Balance number to 7 or 8 Introduce only enough negative bias to achieve sufficiently stable operation Reduce the detector s Sensitivity as needed Note While some background chatter may remain the more definitive response of a target can be recognized If nece...

Page 24: ...15 cm In STD Modes the test targets will produce a consistent full strength tone regardless of their distance from the coil Discrimination bench test A similar test procedure can be used to better understand how to set discrimination levels and the AT Pro s advanced audio characteristics Begin by testing the iron nail in the STD and PRO Modes with the ZERO discrimination pattern Listen to the Low ...

Page 25: ... signature to that of a bottle cap in this PRO Mode Iron Audio setting The bottle cap makes a response that is unmistakably iron Final tip Record the results of your bench tests and refer to them when hunting in the field Knowledge of the PRO Mode and the Iron Audio feature can reduce the amount of trash targets that are dug UNDERWATER OPERATION The AT Pro can be immersed in water to a 3 meter dep...

Page 26: ...s by rotating the battery cover housing one quarter turn counterclockwise Pull and remove the cap to slide battery holder out Remove batteries when the AT Pro will be stored for longer than 30 days The AT Pro is a rugged machine designed for outdoor use in all environments However as with all electronic equipment there are some simple ways to care for the detector to maintain its high performance ...

Page 27: ...hat excessive amounts of electrical interference exists plus excessive amounts of metal can be found in floors and walls 3 Determine if you are close to other metal detectors or other metal structures such as electrical power lines wire fences benches etc 4 Adjust frequency 5 Reduce your sensitivity setting Intermittent Signals Intermittent signals typically mean you ve found a deeply buried targe...

Page 28: ...ts and labor but does not cover damage caused by alteration modification neglect accident or misuse Use of the AT Pro at submerged depths exceeding 3 meters will void this warranty In the event you encounter problems with your AT Pro detector please read through this Owner s Manual carefully to ensure the detector is not inoperable due to misadjustments Press and hold the power pushbutton for 5 se...

Page 29: ...ett PRO POINTER Pinpointing Detector Part No 1166000 The PRO POINTER combines performance with sleek design to assist in pinpointing hard to find targets Includes proportional audio vibration pulse rate target indicators and 360 side scan detection area Water resistant with LED light for low light uses Includes woven belt holster and 9 volt battery ToseeGarrett scompletecollectionofmetaldetectorac...

Page 30: ...ses Author master treasure hunter European Metal Detecting Guide Highlights include Hundreds of full color photographs 5 5 x 8 5 size 324 pages soft cover Part No 1562100 Field tips from dozens of European metal detectorists Explanation of detector and searchcoil technology Illustrations of proper detector techniques European treasure laws information Ideal reading for new detectorists RAM BOOKS T...

Page 31: ...lly experience Proper basic search techniques with illustrations TO VIEW OTHER RAM BOOKS Go to www garrett com and visit the Hobby Division An order form is available on our site which can be printed and mailed with your requested titles and payment 1881 W State Street Garland Texas 75042 Toll Free 800 527 4011 Tel 972 494 6151 Fax 972 494 1881 Email sales garrett com 2012 Garrett Electronics Inc ...

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