Fisher Research Labs F75 Comprehensive Operating Manual & Manual
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Fisher Research Labs F75 Comprehensive Operating Manual & Manual

Comprehensive operating manual & guide to medal detecting
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Metal Detector
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  • Page 1 Metal Detector & &...
  • Page 2 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

    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 (not included). Weight: 3.5 pounds (1.6 kg) with alkaline batteries installed.

  • 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 Comprehensive Operating Manual & Guide to Metal Detecting Assembly Battery Compartment Headphone Jack Is easy and requires no tools. Release Clip 1. Position detector upright. 2. Rotate the LOCKING COLLAR 2-way fully counterclockwise. adjustable armrest On/Off & 3. Insert your finger inside the tube Volume and make sure the INTERNAL Switch...

  • Page 7: Assembly Instructions

    Comprehensive Operating Manual & Guide to Metal Detecting Assembly (continued) 11. Connect Cable Plug to housing. Do not twist the Cable or Plug. Turn Locking Ring only. Use minimal finger pressure to start the threads. Do not cross-thread. When the Locking Ring is fully engaged over the threaded connector, give it a firm turn to make sure that it is very tight.

  • Page 8: Mechanicals

    Mechanicals BATTERIES (not included) 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: Using Headphones (Not Included)

    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; headphones with a mono plug will not work. This device is to be used with interconnecting cables/headphones shorter than three meters.

  • 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

    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

    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

    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

    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 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 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

    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

    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 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 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 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 23: Pinpoint Feature

    It is a probe-like device which is poked into the ground, making close up pinpointing a snap, reducing digging time, and minimizing the size of the holes you will dig. Fisher Research Labs offers the FPoint™ pinpointer, a robust and inexpensive device designed for this purpose.

  • Page 24: Lcd Visual Display

    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 25: Target Indicators

    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 26: Battery Indicator

    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 27: 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 28: 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 29 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 30 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 31: Search Techniques

    Pinpointing With the Trigger Switch When you turn the F75 on, the ground balance setting is preset to give a positive response on nearly all soils. This means that if you are pulling the pinpoint trigger, the audio tone will get louder as you lower the searchcoil to the ground.
  • Page 32 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 33: False Signals And Chatter

    If the interference is from a communications or broadcast transmitting antenna, reducing the sensitivity is usually your only recourse. The F75 allows you to shift operating frequencies to avoid electrical interference. See the Frequency Shifting section for information about this technique.

  • Page 34: 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 35: Tips On Ground Balancing

    So, you may do better if you reduce the Sensitivity setting. 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 36: Detecting Activities

    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 37: Relic Hunting

    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 38: 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 39 Comprehensive Operating Manual & Guide to Metal Detecting Detecting Activities (continued) Gold Prospecting (continued) Because most gold nuggets are tiny, and are usually found in soil which is high in iron oxide minerals, serious gold prospecting requires a detector with high sensitivity and true ground balanced motion all metal operation.

  • Page 40: Cache Hunting

    Shallow Water Hunting All Fisher Research Labs searchcoils are waterproof, allowing you to search in shallow water about two feet deep. If searching around water, be careful not to get the electronics housing wet.

  • Page 41: Salt-Water Hunting

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

  • Page 42: How Metal Detectors Work

    3 dB. Antennas not included in this list or having a gain greater than 3 dB are strictly prohibited for use with this device. The required antenna impedance is 53 ohms. 10COIL-F70, 11COIL-F75, 5COIL-F75, 6COIL-E The following statement is not relevant to metal detectors but is printed here to satisfy legal notification requirement: “To reduce potential radio interference to other users, the antenna type and its gain should be...

  • Page 43: Warranty

    Comprehensive Operating Manual & Guide to Metal Detecting 5-Year Limited Warranty The F75 metal detector is warranted against defects in materials and workmanship under normal use for five years from the date of purchase to the original owner. Damage due to neglect, accidental damage or misuse of this product is not covered under this warranty.

  • Page 44: Accessories

    ® 100% white cotton with Fisher Logo. Sizes – LG, XL & XXL Replacement/Accessory Search Coils 11” Biaxial Accessory Coil - 11COIL-F75 10” Concentric Standard Coil (replacement)– 10COIL-F70 6.5” Concentric Accessory Coil - 6COIL-E 5” Biaxial Accessory Coil - 5COIL-F75 Coil Covers Specially made to protect your coil from abrasion and damage.

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