Fisher Labs F75 LIMITED User Manual
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Fisher Labs F75 LIMITED User Manual

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Metal Detector

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  • Page 1 LIMITED Users Manual Metal Detector...
  • Page 2 LIMITED Comprehensive Operating Manual & Guide to Metal Detecting he F75 is a multipurpose metal detector. Its most popular uses are coinshooting and relic hunting, and it is also well-suited to gold prospecting. PRODUCT FEATURES • Light weight and well-balanced: best ergonomically engineered detector in the industry.

  • Page 3: Table Of Contents

    Using Headphones (not included) ......9 Introduction to the F75 General information ........10 Controls .

  • Page 4: Specifications

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Specifications Mechanical: S-rod with electronics housing mounted on handgrip, 3-piece breakdown, batteries under elbow, 2-way armrest adjustment — forward/backward & around forearm. Searchcoil: 11” (28 cm) open-frame elliptical double-D, waterproof. Batteries: 4 AA, alkaline (included).

  • Page 5: Quick-Start

    Turn the knob, located under the armrest, fully clockwise. This turns the machine on and sets audio volume to maximum. When first turned on, the F75 starts out in the Discrimination mode, with: Sensitivity preset to 60 Discrimination Level preset to 10...
  • Page 6 LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Assembly Battery Compartment Headphone Jack 1. Remove all components from box. Release Clip 2. Attach searchcoil to lower rod by lining up the holes. Push coil knob through hole and tighten knob gently. 2-way You will tighten up the coil knob later.

  • Page 7: Assembly Instructions

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Assembly (continued) 7. Push cable into connector on back of housing. Do not twist the cable or plug. 8. Tighten knurled cap nut by hand to secure cable connection to housing. Use minimal finger pressure to start thread.

  • Page 8: Mechanicals

    Comprehensive Operating Manual & Guide to Metal Detecting Mechanicals BATTERIES The F75 requires four AA batteries. These non-rechargeable chemistries may be used: Alkaline, Nickel Oxy-Hydroxide (Panasonic Oxyride or Duracel PowerPix), and lithium iron disulfide (Energizer L91). Nickel metal hydride and nickel-cadmium rechargeable chemistries may also be used.

  • Page 9: Arm Rest Adjustment

    The locking collars must be rotated a full 270° to reach the locking position. HEADPHONES (not included) The F75 is equipped with a standard 1/4-inch stereo headphone jack at the rear of the unit, located under the elbow as you hold the detector for use. Any headphone with a stereo plug should work;...

  • Page 10: General Information

    ID considered essential in searching for coins. The F75 operates at 13 kHz for good sensitivity to gold nuggets and jewelry as well as to coins. The F75 comes with an 11-inch elliptical Bi-Axial searchcoil for maximum detection depth in mineralized soils.

  • Page 11: Controls

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Controls DUAL FUNCTION MENU BUTTON Menu Toggle From Access bP or CL Process Settings Knob Dual-function Trigger switch On/Off & Volume Switch ON-OFF & VOLUME Knob (Under the elbow) This knob turns the machine on or off, and controls speaker volume and headphone volume. Knob position has no effect on detector’s sensitivity or susceptibility to noise from electrical interference...

  • Page 12: Controls

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Controls (continued) The F75 has two controls on the front panel, MENU and SETTINGS. MENU Pushbutton (Red button on right of the front panel) Push the MENU button to: 1. Step through the menu selections on the display.

  • Page 13: Menu System

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting The Menu System The entire menu is printed on the LCD display. The display highlights the mode and settings which are in use. There are three search modes: Static All Metals, Motion All Metals, and Discrimination. To change between an All Metals mode and Discrimination mode, the top line of the menu system must be highlighted.

  • Page 14: Ground Balancing

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Ground Balancing What is Ground Balancing? All soils contain minerals. Signals from ground minerals are often tens or hundreds of times as strong as the signal from a buried metal object. The magnetism of iron minerals, found in nearly all soils, causes one type of interfering signal.
  • Page 15 LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Ground Balancing (continued) MANUAL GROUND BALANCING In most situations, it is preferable to push the trigger switch to activate FASTGRAB automatic ground balancing. Generally, it is best to first let the computer automatically cancel interference from ground minerals.
  • Page 16 LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Ground Balancing (continued) 3. Turn the SETTINGS KNOB to adjust the setting. The goal is to eliminate the sound as the coil is being pumped over the ground. In some soils, the sound is not completely eliminated. If the ground balance adjustment is incorrect, there will be a difference in the sound as the searchcoil is either moving toward or away from the ground.

  • Page 17: Motion All Metal Mode

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Motion All Metal Mode The Motion All Metal mode is more sensitive and offers better feel than the Discrimination mode, and is used to find all metal objects present in the ground. The searchcoil must be in motion for objects to be detected.

  • Page 18: Static All Metal Mode

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Static All Metal Mode This mode is useful for finding large, deep objects, i.e. larger than a coin and deeper than 12 inches (30cm). STATIC functions similar to PinPoint but occupies a different position on the user interface.

  • Page 19: Discrimination Mode

    The F75 discrimination system is much improved over conventional discrimination systems, and may function quite differently than other discriminators you may be accustomed to. In older systems, the apparent sensitivity decreases as discrimination level increases. The F75’s sensitivity may increase as discrimination increases, depending on the process number and notches being used.
  • Page 20 LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Discrimination Mode (continued) NOTCH Unlike Discrimination Level, which eliminates all targets from the left of the scale to the right, NOTCH can eliminate and re-include targets within the scale displayed at the top of the display.
  • Page 21 LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Discrimination Mode (continued) Using DISC LEVEL in conjunction with NOTCH gives you a great deal of flexibility in deciding which values to include or exclude from detection. Beware that this combination can be confusing.
  • Page 22 LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Discrimination Mode (continued) FOUR DIFFERENT AUDIO TONES This selection is similar to 3, but with a fourth medium- high tone for targets in the numeric range of 53 to 65. This four-tone system is useful for searching in areas where there may be very old coins which register in this range.

  • Page 23: Discrimination Mode

    ID and audible response. By making the audio and visual systems independent, the F75 allows each system to do what it does best. The audio is optimized for quick response and target feel, whereas the visual system provides the best...

  • Page 24: Pinpoint Feature

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting PinPoint Feature After a buried target has been located using the All Metal or Discrimination modes, you want to pinpoint the exact location of the target in order to facilitate its recovery. Accurate target pinpointing will minimize digging.

  • Page 25: Lcd Visual Display

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting LCD Visual Display In normal operation, when the searchcoil passes over a metal object, the electrical signature (2-digit I.D.) of the metal object is displayed on the numeric display for 4 seconds, unless superceded by another detected object.

  • Page 26: Depth Indicators

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting LCD Visual Display (continued) Since different metal objects can produce similar signals, and since minerals in the soil can distort the signals, the probable target ID's are just that -- probable. There is no way of knowing for sure what's buried other than to dig it up.

  • Page 27: Battery Indicator

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting LCD Visual Display (continued) BATTERY CONDITION INDICATOR Fresh alkaline batteries will illuminate all three bars. When no bars are displayed and the batteries are about to go dead, the BATT legend will start flashing. The detector should operate for an additional 30 minutes from the time the BATT legend starts flashing.

  • Page 28: Frequency Shifting

    If the detector chatters or emits intermittent false signals in the field, you are also probably experiencing electrical interference. If you suspect electrical interference, you may change the F75’s operating frequency. This is a trial and error method to try to find a frequency different from the suspected source.

  • Page 29: Capabilities & Limitations

    Capabilities And Limitations DEPTH The F75 can detect U.S. coins to a depth of up to 15-16 inches (37-40cm) under good conditions. Large objects (55 gallon drums, manhole covers, etc.) can be detected to a depth of up to several feet (1-2 meters).
  • Page 30 In order to most accurately verify a detected target with most other metal detectors, users will narrow their sweep and loiter over the top of the target. The F75 is different. The F75's quick response and advanced signal sampling system produces the most accurate target IDs with deliberate (shoulder width) sweeps all the way across the target, even if there are other targets nearby.

  • Page 31: Capabilities & Limitations

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Capabilities And Limitations (continued) STEEL BOTTLE CAPS & FLAT IRON TRASH Modern motion-type target ID metal detectors usually have difficulty consistently identifying steel bottle caps and other flat iron trash objects. Double-D searchcoils also have a reputation for having difficulty distinguishing steel bottle caps from coins, and for being unable to eliminate steel bottle caps from detection.

  • Page 32: Search Techniques

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Search Techniques Sweeping Searchcoil (this does not apply to Pinpointing with the trigger switch) Keep the searchcoil in motion to RIGHT detect targets. Sweep the searchcoil parallel to the ground; do not lift the searchcoil at the end of the sweep.

  • Page 33: Pinpointing Targets

    If you are new to the F75, toggling back to default process from bP or CL can serve as a learning tool to understand the different response characteristics of the different processes.

  • Page 34: Estimating Target Size And Depth

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Search Techniques (continued) Position the searchcoil an inch or two (2.5-5cm) above the ground, and to the side of the target. Then pull the trigger. Now move the searchcoil slowly across the target, and the sound will indicate the target’s location.

  • Page 35: False Signals And Chatter

    ID numbers will be greater than 12. The F75 has a tendency to up-average nonferrous targets in the proximity of iron, indicating ID numbers higher than would be obtained in an air test. This tendency is connected with the F75’s enhanced see-through ability –...
  • Page 36 LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Search Techniques (continued) NUISANCE BURIED OBJECTS In some areas there is a lot of metallic trash which produces weak signals. These could include deeply buried objects, little bits and pieces of rusty iron and corroded foil. These items can be detected, but are difficult to pinpoint due to their depth and small size.

  • Page 37: Adjusting Sensitivity

    In that case, you can revert to the rule of thumb -- “don’t dig non- repeatable signals”. Using the sensitivity control When the F75 is first turned on, the Sensitivity is at a medium setting appropriate for most coinshooting. For relic hunting or gold prospecting, higher Sensitivity settings are usually preferred.

  • Page 38: Tips On Ground Balancing

    Search Techniques (continued) Tips on ground balancing When the F75 first turns on, the ground balance setting is preset to 90. This will give a positive response on nearly all soils. If you search in the Discrimination mode, you will probably not have to balance to the ground.

  • Page 39: Detecting Activities

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Detecting Activities Coinshooting Coinshooting is searching for coins, usually in places like parks, schoolyards, church lawns, and people's yards. In most places where coins are likely to be found, there is also a lot of aluminum trash like pull-tabs and bottle caps, as well as steel bottle caps and often nails.

  • Page 40: Relic Hunting

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Detecting Activities (continued) Relic Hunting Relic hunting is searching for historical artifacts. The most common desired objects are battlefield debris, coins, jewelry, harness hardware, metal buttons, trade tokens, metal toys, household items, and tools used by workmen and trades people.

  • Page 41: Gold Prospecting

    The ground balancing and Fe bar graph features of the F75 can be used to map the soils of a site. In this way you might determine which areas have been dug, backfilled, or subjected to fire.

  • Page 42: Gold Prospecting

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Detecting Activities (continued) Gold Prospecting (continued) minerals, serious gold prospecting requires a detector with high sensitivity and true ground balanced motion all metal operation. Run the machine with the sensitivity high enough to hear some noise from ground minerals, and learn the language of the sounds you hear.

  • Page 43: Cache Hunting

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting Detecting Activities (continued) Cache Hunting A cache (pronounced "cash") is an accumulation of money, jewelry, gold, or other valuables, which someone has hidden. When people bury a cache, they usually put it in a strongbox or in a jar. To search for a cache, you first need a reason to believe the cache may exist.

  • Page 44: Shallow Water Hunting

    Saltwater Hunting Saltwater is highly conductive, and produces a strong signal which is like that of metal. The F75 is not specifically designed for high performance in saltwater, but can be used in this environment. If you desire to search in or over saltwater, the following measures will usually be sufficient to silence the saltwater response while retaining acceptable sensitivity: 1.

  • Page 45: How Metal Detectors Work

    LIMITED Comprehensive Operating Manual & Guide to Metal Detecting How Metal Detectors Work Most hobby metal detectors use VLF Induction Balance technology. Here's how they work. The search coil (also called search head or loop) contains two electrical induction coils which are like antennas.
  • Page 46 LIMITED Comprehensive Operating Manual & Guide to Metal Detecting...
  • Page 47 LIMITED Comprehensive Operating Manual & Guide to Metal Detecting...

  • Page 48: Warranty

    Fisher Labs. Shipping cost to Fisher Labs is the responsibility of the consumer. To return your detector for service, please first contact Fisher Labs for a Return Authorization (RA) Number. Reference the RA number on your package and return the detector within 15 days of calling to: Fisher Research Labs, Inc.

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