Impulse Pulse Induction Metal Detector Operating Manual FISHER RESEARCH LABORATORY
CONTENTS About Your Impulse ................................................................ pg. 1 Condensed Operating Instructions ...................................... pg. 3 Assembly ................................................................................. pg. 4 Setting Up................................................................................. pg. 6 For Land or Shallow Water ................................................. pg. 6 For Diving ...............................................
ABOUT YOUR DETECTOR Fisher Research Laboratory has been producing rugged, high quality, high performance metal detectors since 1931, longer than any other company in the world. Your IMPULSE is a product of that proud heritage. Designed for deep-sea treasure hunting, the IMPULSE will also do the job in surf, on the beach, in fresh water or on land. Pulse induction (PI) metal detectors have been around for years.
ABOUT YOUR DETECTOR Here are some important features built into your IMPULSE: 1. LCD: A liquid crystal display gives a visual indication of signal strength; with a bar graph that climbs as the signal strength increases. The LCD also constantly monitors battery strength. 2. LED: A light emitting diode flashes when a target is located. 3. VCO Pinpointing: An audio signal tone increases in pitch and volume as the center of the search coil passes over the target. 4.
ABOUT YOUR DETECTOR 13. All Metals: The IMPULSE detects all metals. It has no “discrimination” circuitry, which drastically reduces the ability of a pulse induction metal detector to detect gold and silver. 14. Easy to Use: Just pick it up, turn it on and adjust the TUNER control to the threshold level. You’re ready to hunt.
CONDENSED OPERATING INSTRUCTIONS 9. Retune your IMPULSE before resuming your search. 10. Good Hunting! ASSEMBLY Light emitting diode (LED) Battery access panel (not shown) Liquid crystal Display 8-inch Spider coil Nylon wing nut Control panel Fiberglass reinforced lower stem Foam hand grip Adjustable arm rest Coiled cable Headphone plug Submersible headphones Arm rest screws Fiberglass upper stem Fisher M-Scope IMPULSE pulse induction metal detector.
ASSEMBLY stem, push in the spring lock, pull out the lower stem and let the spring lock snap into another hole. 3. If you will be using the IMPULSE on the handle and not body mounted, wind the search coil cable around the handle assembly as shown in the diagram on page 4. Secure the cable with the two Velcro straps included with your IMPULSE. Make sure there is some slack at the control-housing end and enough at the other end to attach the search coil. 4.
SETTING UP FOR LAND OR SHALLOW WATER Put the headphones around your neck to keep them out of the way while making the following adjustments: 1. Adjust the stem length and coil angle so the search coil rests flat on the ground about 6 inches in front and slightly to the right of your right foot (to the left of your left foot if you’re left handed). Your arm should be straight and relaxed with the handle grip held firmly but comfortably.
SETTING UP FOR DIVING Unlike induction-balance metal detectors, the IMPULSE ignores the disruptive influences of salt water and black sand. This capability, along with its deep-seeking sensitivity to iron, makes it ideal for underwater treasure hunting and wreck diving. The IMPULSE is also waterproof to a depth of 250 feet. Remember, always practice safe diving methods. Caution: Hipmounting the IMPULSE control housing is not recommended for underwater use.
SETTING UP FOR HIPMOUNTING For almost effortless treasure hunting, the control housing is easily removed from the handle and attached to a belt clip. “Hipmounting” the IMPULSE in this manner takes half the weight off the handle and allows the land or shallow-water Treasure Hunter to search much longer without arm fatigue. 1. Grasp the handle grip firmly with one hand and the control housing with the other. 2. Slide the control housing off the mounting bracket by pulling it toward you. 3.
CONTROL PANEL 1. TUNER/BATT TEST CONTROL: Tunes the detector to its maximum sensitivity by adjusting the “threshold level” to a faint tone. Also, when turned to BATT TEST position, signals condition of batteries with audio tone and LCD bar graph. 2. Liquid Crystal Display: LCD gives a continuous, visual check of battery condition and provides a visual display of signal strength. A bar graph rises with an increase in signal strength and falls with a decrease in signal strength.
TUNING Tuning your IMPULSE is a simple but necessary step before beginning your search. If you’re hunting underwater, the following steps should be performed underwater. 1. Hold the coil up and away from any metal. 2. Set the tuner full counter clockwise, just before it clicks into the “BATT TEST” position. 3. Set the VOLUME control knob to “10.” 4.
SEARCHING When the stem length is properly adjusted the IMPULSE is balanced for sweeping in a tight semicircle. Wide to the right for right handers. Wide to the left for left handers. Be sure to overlap your sweeps. 3. Walk slowly and sweep the search coil in a tight semicircle, keeping the coil parallel and as close to the ground as practical. 4. The IMPULSE has three signals that alert you to a target: 1) an audible tone, 2) a meter that measures signal strength and 3) a flashing red light.
SEARCHING 7. Take your time. If you walk too fast you can’t overlap your sweeps, and you’ll miss a lot of ground. The LCD indicates signal strength and continuously monitors battery conditions. NOTE: Your threshold tone will probably go up and down as you search. This is a perfectly normal response since the distance between your coil and the ground varies as you sweep the coil back and forth. You may want to readjust your threshold level slightly to maintain a comfortable “average” threshold volume.
SEARCHING NOTE: Your threshold tone will probably go up and down as you search. This is a perfectly normal response since the distance between your coil and the bottom varies as you sweep the coil back and forth. You may want to readjust your threshold level slightly to maintain a comfortable “average “ threshold volume. You will also have to readjust it if the ground mineralization changes sufficiently.
PINPOINTING front to back, to find the spot where the bar graph peaks and the signal tone is loudest and highest. Because the scan area of pulse-induction metal detectors is fairly wide, further pinpointing may be required, especially on large or very shallow targets. 4. Readjust the TUNING control slightly counterclockwise, throwing the instrument slightly out of tune below the audio threshold point. When the IMPULSE is detuned, the sensitivity of the coil is decreased. 5.
TARGET RECOVERY Once you’ve identified and pinpointed a target, your objective is to recover it quickly and neatly, leaving virtually no trace of your excavation. There are almost as many ways to do this as there are treasure hunters. Whatever works for you is good enough as long as you don’t break any laws, damage vegetation or leave uncovered holes. Generally speaking, beachcombers do little if any damage to the environment while recovering targets.
OPERATING TIPS 1. Keep the search coil cable wound snugly around the stem when diving around coral or jagged rocks to keep it from snagging. 2. Divers should make sure the drain holes in the headset are unobstructed. Better yet, wait until you’re on the bottom before putting your headset on, and take it off before surfacing. 3. Divers should also keep the search coil at least 2 feet away from their bodies. Metal gear (weights, gauges, tanks, etc.) will be detected by the IMPULSE if held too close. 4.
OPERATING TIPS tuning. Practice pinpointing. Reread the appropriate part of this manual if you’re having problems. BATTERIES Eight AA batteries located in the rear section of the control housing power the IMPULSE. The batteries are sealed off from the electronics so that accidental water leakage into the battery compartment will not damage the circuitry. To replace the batteries, remove the battery access panel: 1.
BATTERIES 4. Reconnect the battery lead. 5. Insert the battery pack into the Control Housing with the lead connector on top. Fold the leads across the top of the pack. 6. Make sure the O-Ring and both sealing surfaces are clear before reinstalling the battery cover. THIS IS EXTREMELY IMPORTANT! 7. Finger tighten the thumb screws, and then carefully tighten again 1/4 turn with a coin or screwdriver. HOME RECHARGER Recharging Nicad batteries with the optional 110-volt recharger is a simple procedure: 1.
BATTERIES 2. Connect the cigarette lighter recharger battery lead to the battery pack. 3. Plug the recharger into the cigarette lighter socket, and the batteries will immediately begin recharging. 4. The small, green light may glow briefly if the batteries are completely dead and the engine is running. Normally, it will not glow at all. 5. An overnight charge with the engine off may give only 6 to 8 hours of battery life. A full charge may take as long as 48 hours (less with the engine running).
MAINTENANCE Your IMPULSE doesn’t require a lot of care. It’s built with high quality materials, and it’s waterproof to a depth of 250 feet. But there are a few things you should do to keep it in peak operating condition. STORAGE 1. If you’re not going to be using it for a while, take the batteries out. Acid damage caused by leaking batteries can be severe. 2. Avoid extreme temperatures. Don’t leave it inside a closed car sitting in the sun or even worse, in the trunk of a car. CLEANING 1.
TREASURE HUNTER’S CODE OF ETHICS LETS PRESERVE OUR TREASURED SPORT! Laws governing the use of metal detectors are becoming more and more common. In many countries, the use of metal detectors is illegal or severely restricted. Don’t let this happen in your area. ALWAYS get permission to hunt on private property. ALWAYS leave a site cleaner than you found it. Take at least some trash with you or, if you can, take it all. ALWAYS fill in your holes neatly whether you’re in a city park or remote wildernessness.
Where To Use Your Metal Detector In The U.S. National Forest and Federal Lands—Metal detecting is allowed only by special permit acquired from the federal government. Each area has a district office. Corps of Engineers, Lakes, Shorelines and Lands—Permission has been granted only on predisturbed sites, such as beaches and attached swimming areas. New Corps lakes and lands must be okayed by the main office of the Army Corps of Engineers. Each area has a district office.
SPECIFICATIONS 1 Length 2 ......... Extended ...................................................................... 50" Collapsed ...................................................................... 31" 8" Coil Weight ........ Complete (with Headset) .................. 5.2 lbs. Handle and Search Coil ...................... 2.3 lbs. Control Housing ..................................... 2.4 lbs. 2 10 1/2" Coil 5.5 lbs. 2.6 lbs. 2.4 lbs. Transmit Frequency ........................................
SPECIFICATIONS NOTES 1. Subject to modification without notice. 2. Approximate. 3. VCO: Voltage Controlled Oscillator. Volume and frequency increase as target is approached. 4. LED: Light Emitting Diode. Bright red light. 5. LCD: Liquid Crystal Display. Bar graph displays signal strength and battery condition. 6. ESI: Electro-Static Insulated to reduce certain types of false signals. 7. The length and terms of the warranty will vary outside the U.S. Check with your distributor for details.
25
QUALITY Fisher detectors are renowned for their quality. Each detector is hand crafted in the USA with pride PERFORMANCE Treasure Hunters worldwide rely on Fisher. Our detectors are durable, dependable, and search deeper.. REPUTATION Fisher produced the first patented metal detector in 1931. For over 70 years, the Fisher logo has been a mark of excellence.
