TM AT PRO Owner’s Manual The powerful, all-terrain solution for locating deeply buried relics, coins and jewelry! 1881 W. State Street Garland, Texas 75042 Tel: 1.972.494.6151 Email: sales@garrett.com Fax: 1.972.494.1881 © 2012 Garrett Electronics, Inc. PN 1533200.C.
THANK YOU FOR CHOOSING GARRETT METAL DETECTORS! Congratulations on the purchase of your new Garrett AT Pro™ 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 AT Pro includes Garrett's exclusive Target ID technology and patented discrimination features.
TABLE OF CONTENTS AT Pro Control Panel.................................................................... 4 Quick Start Guide............................................................................ 5 AT Pro Components........................................................................ 6 List of Parts..................................................................................... 7 Assembly........................................................................................... 8 POWERING ON.
AT Pro CONTROL PANEL Target ID Legend indicates metal types. Digital Target ID Target ID Cursor (also shows indicates ground balance probable settings while in target identity. GND-BAL mode.) High Resolution Iron Discrimination indicates level of iron discrimination selected. QUICK START GUIDE Lower Scale indicates notch discrimination pattern. Coin Depth Indicator indicates depth of coin-sized target. Mode Indicator 1. Install batteries.
AT Pro COMPONENTS LIST OF PARTS No tools are required to assemble the AT Pro. Four (4) AA batteries are included with the detector.
ASSEMBLY 1. Holding the upper and lower stem assembly in front of you (as shown below), twist camlock to the right (clockwise) to loosen. 2. Slide lower stem out to engage spring clips in upper stem holes. 3. Align the holes in the mounting washers with the small posts on the lower stem and press firmly into place. 1. 2. 7. Depress the spring clip in the S-stem (containing control housing) and insert S-stem through the upper camlock collar into the upper stem. 8.
12. If needed, adjust 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. POWERING ON 13. 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.
SEARCH MODES The AT Pro includes six detection modes: three Standard (STD) Modes and three Professional (PRO) Modes. It is recommended to begin searching with one of the Standard Modes to become familiar with the AT Pro before switching to the more advanced audio features provided by the Pro Modes. Tap the Mode button to scroll through the six modes: the modes are Custom, Coins or Zero in the STD Mode and Custom, Coins or Zero in the PRO Mode.
• Coins Mode Designed to find most types of coins, jewelry, etc., while eliminating trash items such as iron and foil. High-Res Iron Discrimination level has been preset to 35 to exclude most iron targets. In addition, one pixel of foil and two pixels in the pulltab range have been excluded. Be aware that most pulltabs and pieces of tabs have not been eliminated from detection as these trash items have conductivities similar to small coins and jewelry.
Audio Target Response Comparison: Standard vs Pro Mode Adjacent Targets Comparison: Standard vs Pro Mode Shallow coin Deep coin 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.
Tone Roll Audio (Pro Mode) This feature of Pro Mode provides the user with more audible target information to help identify targets, particularly flat iron objects, such as bottle caps and washers. Standard Mode audio produces a single tone based upon the target’s strongest signal. For flat iron objects, this single tone is often the same as a good target. Tone Roll Audio, however, provides a variance of target tones as the searchcoil approaches and passes over the target.
DIGITAL TARGET ID Digital Target ID Target ID Cursor The AT Pro’s Digital Target ID system provides a specific target value to help identify targets more precisely. Targets are identified on the LCD by number, with items near 1 being the most ferrous. The most conductive targets (such as thick silver) register closer to to 99. The Digital Target ID is a more precise version of the Target ID Cursor shown in the Upper Scale. Each Target ID Cursor has a width of 5 digital points.
Example: Manual Modification of Notch Discrimination Pattern DISCRIMINATION Notch Discrimination—The AT Pro's NOTCH DISC pushbuttons are used in conjunction with the ELIM pushbutton to eliminate trash objects from detection such as foil or pulltabs. 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.
on either side. The AT Pro is now programmed to find the missing earring based on the conductivity of its matching pair. Note: The notch discrimination function can be used to modify each Mode’s discrimination pattern. Notch Discrimination modifications made while in CUSTOM (either in Standard or Pro mode) will be retained when the detector is switched OFF.
Example: Detecting Targets in Trash with High-Res Iron Discrimination In the illustration above, the AT Pro is operating with an IRON DISC setting of 20. The nail seen in Illustration 1 (on page 25) registers from 10 to 25 on the Digital Target ID scale. To eliminate the nail from detection, increase the iron discrimination level to 25 using the IRON DISC (+) pushbutton. IRON AUDIO Iron Audio ON IRON AUDIO Pushbutton In Illustration 2, the same iron nail is laying above a good coin target.
Refer to the illustrations below regarding the use of the Iron Audio feature: IRON AUDIO OFF: Normal division of low, mid and high tones. IRON AUDIO OFF: With the Iron Discrimination set to 20, all targets below 20 are silent. iron object like a bottle cap or steel washer will produce a very distinctive Low-High-Low response. Tip for using Iron Audio: In areas with high concentrations of iron, it is recommended to switch off Iron Audio. Otherwise, it may produce far too many signals.
SENSITIVITY GROUND BALANCE GND BAL Indicator (only displays on LCD when in use) GND BAL Setting (only displays while in Ground Balance mode) SENSITIVITY Pushbutton Sensitivity Indicator The AT Pro has eight (8) settings for sensitivity. Use the (+) or (-) SENSITIVITY buttons to step through the eight levels, which are continuously shown on the LCD. Use higher sensitivity levels when searching for very small or very deep targets.
balance values indicate conductive soil; high ground balance values indicate ferrous soil. Manual Ground Balance: You may want to use the Manual Ground Balance function to ground balance slightly positive to enhance detection of small targets or balance slightly negative to reduce detection of "hot rocks," terra cotta and saltwater. Press and release the GND BAL pushbutton and continually bounce (pump) the searchcoil from 1 to 8 inches above the ground.
Upper Scale indicates signal strength PINPOINTING 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 inch). 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 inch).
Coin Depth Indicator—The depth of a coin, or similar sized target, is indicated in 2-inch increments. 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 searchcoil.
You can reverse this pinpointing technique to pinpoint off the DD coil's tail; in this case, push the coil away from you. The audio and LCD meter will place the target just off the searchcoil's tail. • Alternative pinpointing technique: DD-wiggle. Quickly locate targets without using the Pinpoint button as follows. Continuously swing the searchcoil side-to-side using fast, narrow swings of 2 to 4 inches (i.e. wiggle).
• Walk slowly as you scan your searchcoil in a straight line from side to side at a speed of about 2 to 5 feet per second. Advance the searchcoil about half the length of the searchcoil at the end of each sweep. Overlap Swing by 14 cm 1m/sec 1m/sec Overlap Swing by 14 cm 1m/sec Walk slowly to allow overlapping of the searchcoil Scan side to side approx. 3 ft per second.
• The detector will be less stable in shallow, breaking surf where the searchcoil is in and out of the saltwater. In this area the detector is encountering a constantly changing environment produced by the surf, making it difficult for the detector to stabilize. To improve stability, negatively bias the ground balance by several points. To do so, simply press and release the Ground Balance button and use the (-) NOTCH DISC pushbutton to manually reduce the ground balance setting.
BENCH TESTS You should conduct bench tests to become more familiar with the AT Pro’s operation in both Standard and PRO modes. In addition, the use of the Iron Audio feature should be tested in both Standard and PRO modes. Suggested test items should include: • Coins • Iron nail • Bottle cap or steel washer To conduct a bench test, place the searchcoil on a flat, non-metallic surface that is several feet from other metallic objects. Begin by testing in the STD Mode with the ZERO discrimination pattern.
at a distance of 3 to 4 inches. Note that the bottle cap's flat surface gives a Digital Target ID reading in the 75–85 range and produces the high tone of a "good" target. Next, switch to PRO Mode and pass the bottle cap across the coil again and notice the different audio. The clean sound heard in STD has been replaced with a mixed, chirping tone that has subtle low tones at the beginning and end, indicating a possible junk target.
CARE AND MAINTENANCE Battery Level Indicator Battery Replacement—The AT Pro is operating with fresh or fully charged batteries when 4 illuminated bars on the Battery Level Indicator (see above) are displayed. The detector will maintain full performance until the batteries need to be replaced. Replace batteries when there is only one segment remaining. NiMH rechargeable batteries may be used. Expect 20 to 40 hours of operation depending on battery type and quality.
TROUBLESHOOTING GUIDE SYMPTOM SOLUTION No power 1. Ensure batteries are installed in the correct position. 2. Replace all old batteries with all new batteries. Erratic sounds or target ID cursor movement 1. Ensure your searchcoil is securely connected with the O-ring properly sealed and that the coil cable is snugly wound around the stem. 2. If using the detector indoors, be aware that excessive amounts of electrical interference exists, plus excessive amounts of metal can be found in floors and walls.
CAUTIONS When searching for treasure with your Garrett detector, observe these precautions: • Never trespass or hunt on private property without permission. • Avoid areas where pipelines or electric lines may be buried. • National and state parks / monuments, etc are absolutely off-limits. • Deepseeking detectors can detect concealed pipes, wiring and other potentially dangerous material. When those are located, the proper authorities should be notified.
AT Pro ACCESSORIES 4.5" Super Sniper™ Searchcoil— Part No. 2222500 Use when searching for small, shallow targets or in trashy or tight places. 6.5" x 9" PROformance Concentric Searchcoil— Part No. 2222600 Smaller and lighter than the AT Pro's standard DD coil, this waterproof searchcoil offers excellent depth in less mineralized soils. 9" x 12" PROformance Concentric Searchcoil— Part No. 2222700 This larger size concentric searchcoil is waterproof and offers excellent depth in less mineralized soils.
SUGGESTED READING Keep the facts handy: pocket size treasure-hunting field guides written by Charles Garrett. Collect them all! This edition includes the author's personal experiences of hunting in Europe, plus tips and techniques. 76 pages. PN 1546200 RAM BOOKS TITLES Please note that RAM Books, the publishing division of Garrett Metal Detectors, continues to release new titles each year related to treasure hunting, gold prospecting, coin hunting and relic recovery.
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. PN 1533200.C.
