Fisher Labs F 75 User Manual
  1. Manuals
  2. Brands
  3. Fisher Labs Manuals
  4. Metal Detector
  5. F 75
  6. User manual

Fisher Labs F 75 User Manual

Multipurpose metal detector
Hide thumbs
Table of Contents

Advertisement

Quick Links

Users Manual
Metal Detector

Advertisement

Table of Contents
loading

Related Manuals for Fisher Labs F 75

Summary of Contents for Fisher Labs F 75

  • Page 1 Users Manual 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

    Comprehensive Operating Manual & Guide to Metal Detecting Table Of Contents Specifications ..........4 Quick-Start .

  • Page 4: Specifications

    Comprehensive Operating Manual & Guide to Metal Detecting Specifications S-rod with electronics housing mounted on handgrip, 3-piece Mechanical: breakdown, batteries under elbow, 2-way armrest adjustment — forward/backward & around forearm. 11” (28 cm) open-frame elliptical double-D, waterproof. Searchcoil: 4 AA, alkaline (included). Batteries: 3.5 pounds (1.6 kg) with alkaline batteries installed.

  • Page 5: Quick-Start

    Comprehensive Operating Manual & Guide to Metal Detecting Quick Start Use your F75 right out of the box Assemble the detector (see instructions beginning page 4). Install four AA alkaline batteries. All positive (button-end) terminals point up. Batteries are included with the detector. Turn the knob, located under the armrest, fully clockwise.
  • Page 6 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

    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. Do not force threads. Nut may not completely cover all threads when fully engaged.

  • 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. Zinc-carbon and so-called “heavy duty”...

  • Page 9: Arm Rest Adjustment

    Comprehensive Operating Manual & Guide to Metal Detecting Mechanicals (continued) ARM REST The arm rest WIDTH and POSITION are both adjustable. Arm Rest Width: The sides of the arm rest can be bent inward and outward. To best stabilize the detector to your arm and body movement, squeeze the sides of the arm rest around your forearm.

  • Page 10: General Information

    Comprehensive Operating Manual & Guide to Metal Detecting Introduction to the Fisher F 75 The F75 is a multi-purpose high-performance computerized metal HIGH PERFORMANCE detector. It has the high sensitivity and ground balancing control needed for professional gold prospecting, the discrimination responsiveness needed for serious relic hunting under difficult conditions, and visual target ID considered essential in searching for coins.

  • Page 11: Controls

    Comprehensive Operating Manual & Guide to Metal Detecting Controls Menu Button 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. With each push of the button, the next menu selection will be highlighted.

  • 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

    Comprehensive Operating Manual & Guide to Metal Detecting Discrimination Mode The Discrimination Mode is used to eliminate trash metal objects from detection, e.g. nails, aluminum foil, or pull-tabs. The searchcoil must be in motion for metal objects to be detected. Discrimination incurs some loss of sensitivity to small or deep objects.
  • 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 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: Pinpoint Feature

    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 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

    Comprehensive Operating Manual & Guide to Metal Detecting Frequency Shifting One disadvantage of a highly sensitive metal detector is its susceptibility to electrical interference from other electronic devices. If the detector chatters while the searchcoil is not in motion, the cause is either electrical interference or internal circuit noise due to a high sensitivity setting.

  • Page 28: Capabilities & Limitations

    Comprehensive Operating Manual & Guide to Metal Detecting 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 Comprehensive Operating Manual & Guide to Metal Detecting Capabilities And Limitations (continued) GROUND BALANCING To achieve maximum depth in any detection mode, as well as when using the PinPoint feature, the F75 offers the ability to cancel out ground minerals either by manual adjustment, or automatically using the FASTGRAB feature.

  • Page 30: Capabilities & Limitations

    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

    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 32: Estimating Target Size And Depth

    Comprehensive Operating Manual & Guide to Metal Detecting Search Techniques (continued) Estimating Target SIZE, DEPTH, and SHAPE When the trigger is pulled to activate Pinpoint, the LCD displays estimated depth. The estimate is based on the presumption that it is a coin-sized target. But what if it is not a coin-sized target? The most common example is that of an aluminum can.

  • Page 33: False Signals And Chatter

    Comprehensive Operating Manual & Guide to Metal Detecting Search Techniques (continued) Estimating Target I.D. With a single sweep over a target, you will usually see a 2-digit target ID displayed on the LCD. Repeated sweeps back and forth over the target may cause the 2-digit target ID values to change with each sweep of the coil;...
  • Page 34 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 35: Adjusting Sensitivity

    Comprehensive Operating Manual & Guide to Metal Detecting Search Techniques (continued) HOT ROCKS A hot rock is a rock which causes the metal detector to sound off because the rock contains iron minerals. They come in two basic types. Negative hot rocks (also called cold rocks) are usually magnetite or contain magnetite, and give a negative response because their ground balance value is a higher number than the soil they are found in.

  • Page 36: Tips On Ground Balancing

    Comprehensive Operating Manual & Guide to Metal Detecting 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 37: 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 38: 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 39: Gold Prospecting

    Comprehensive Operating Manual & Guide to Metal Detecting Detecting Activities (continued) Relic Hunting (continued) or documentation, their context will be lost. 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 40: Gold Prospecting

    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 41: Cache Hunting

    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 42: Shallow Water Hunting

    Comprehensive Operating Manual & Guide to Metal Detecting Detecting Activities (continued) Shallow Water Hunting (continued) Both fresh and salt water beaches are popular places for metal detecting. Vacationers lose money and jewelry playing in the sand and in the water. It is usually easy to dig in a beach environment, and metal detecting is permitted on most beaches.

  • Page 43: How Metal Detectors Work

    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 44: 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.

This manual is also suitable for:

F75

Table of Contents