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Summary of Contents for Fisher Research Labs F75SE
- Page 1 SPECIAL EDITION Metal Detector User’s Manual Better performance in High-E.M.I. environments. Even better target separation!
- 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.
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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 (not 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. Turn the knob, located under the armrest, fully clockwise. This turns the machine on and sets audio volume to maximum. - Page 6 Comprehensive Operating Manual & Guide to Metal Detecting Forcing in MIDDLE STEM with CAM LOCK raised may form a burr on Caution: Assembly camlock. If this happens, remove burr with knife to allow insertion. Battery Compartment Is easy and requires no tools. Headphone Jack Release Clip Position S-Rod upright.
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Page 7: Assembly Instructions
Comprehensive Operating Manual & Guide to Metal Detecting Assembly (continued) Adjust the LOWER STEM to a length that lets you maintain a comfortable upright posture, with your arm relaxed at your side, and the SEARCHCOIL parallel to the ground in front of you. 10 Wind the CABLE securely around the STEMS. -
Page 8: Mechanicals
Comprehensive Operating Manual & Guide to Metal Detecting 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), lithium iron disulfide (Energizer L91) or Nickel metal hydride chemistries may also be used. Zinc-carbon and so-called “heavy duty”... -
Page 9: Using Headphones (Not Included)
Comprehensive Operating Manual & Guide to Metal Detecting Mechanicals (continued) The LCD screen shows battery condition on the right. ARMREST The armrest WIDTH and POSITION are both adjustable. Armrest Width: The sides of the armrest can be bent inward and outward. To best stabilize the detector to your arm and body movement, squeeze the sides Adjust the armrest in or out accordingly... -
Page 10: Introduction To The F75 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 detector. It has the high sensitivity and ground balancing control needed for professional HIGH PERFORMANCE 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 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. 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 Metal, Motion All Metal, and Discrimination. To change between an All Metal 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 All soils contain minerals. Signals from ground minerals are often tens or hundreds of times What is Ground Balancing? 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) The range of ground balance settings indicated on the display range from 0 to 99; however, each displayed number spans 5 detent steps on the settings knob. The actual internal ground balance settings change with each step;...
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Page 16: Dst Mode
Comprehensive Operating Manual & Guide to Metal Detecting Ground Balancing (continued) depending on which direction the adjustment is off. If the G.B. setting is too high a number, the response of minerals will be positive. This means POSITIVE RESPONSE that when the searchcoil is lowered to the ground in PinPoint, Stat, or Motion All Metal Mode, the sound will get louder as the searchcoil approaches 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. Here are some examples of NOTCH used in conjunction with DISC LEVEL If Discrimination Level is set at 60, and you set the top-of-foil (21-25) notch between 21 and 25, then: top-of-foil range (21-25) is NOTCHED-IN (i.e.
- 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 Comprehensive Operating Manual & Guide to Metal Detecting Discrimination Mode (continued) CL: CACHE LOCATING PROCESS This process is an enhanced sensitivity, slow-speed, version of the dE (default) process. Its primary use is in locating large deep objects while sweeping the searchcoil several inches above the surface of the ground;...
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Page 24: 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 a robust and inexpensive device designed for this purpose item# PIN POINTER. -
Page 25: 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 ID) of the metal object is displayed on the numeric display for 4 seconds, unless superceded by another detected object. -
Page 26: Depth 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 27: 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 28: 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 29: 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 30 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™...
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Page 31: 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 32: 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 33: Pinpointing Targets
Comprehensive Operating Manual & Guide to Metal Detecting Search Techniques (continued) The F75’s other processes have a reputation for lightning-fast response over targets, with the result that the duration of the sound over a good target can be very short, especially in a trashy area. -
Page 34: Estimating Target Size And Depth
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
Comprehensive Operating Manual & Guide to Metal Detecting Search Techniques (continued) Estimating Target-ID 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 36 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.
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Page 37: 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 38: 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 39: 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 40: 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 41: 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 42 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.
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Page 43: Cache Hunting
Mode, frequently pulling the trigger momentarily to maximize sensitivity. 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 44: Saltwater Hunting
Comprehensive Operating Manual & Guide to Metal Detecting Detecting Activities (continued) Shallow Water Hunting (continued) When searching on a beach, it is best to either search in Motion All Metal Mode, or to search with the discrimination level set just high enough to eliminate iron, because the value of beach finds is largely in the jewelry rather than in the coins. -
Page 45: 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 searchcoil (also called search head or loop) contains two electrical induction coils which are like antennas. One coil transmits a rapidly alternating magnetic field, illuminating the region surrounding the searchcoil. -
Page 46: Treasure Hunter's Code Of Ethics
Comprehensive Operating Manual & Guide to Metal Detecting Treasure Hunter’s Code of Ethics: • Always check Federal, State, County and local laws before searching • Respect private property and do not enter private property without the owner’s permission. • Take care to refill all holes and leave no damage. •... -
Page 47: Warranty
All rights reserved, including the right to reproduce this book, or parts thereof, in any form. Published by Fisher Research Labs, Inc. ® Fisher is a registered trademark of Fisher Research Labs, Inc. www.fisherlab.com 1465 Henry Brennan Dr., El Paso, TX 79936 • (915) 225-0333 MADE IN U.S.A. - Page 48 Comprehensive Operating Manual & Guide to Metal Detecting M75MBLK Rev. 4 101514...
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