Table of Contents
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Table of Contents
Related Manuals for Fisher Research Labs F70
Summary of Contents for Fisher Research Labs F70
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Page 1: Metal Detector
Metal Detector Users Manual Also available with 11”DD coil (Item# F70-11DD) - Page 2 • Notch and discrimination controls • Two retrievable user-programmed memory settings If you have any questions, or need assistance with your metal detector, Call 915-225-0333 or 1-800-685-505, and ask for Fisher Hobby Technical Service. Copyright Fisher Research Labs, Inc., 2011...
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Page 3: Table Of Contents
Using Headphones (not included) ........8 Introduction to the F70 General Information . -
Page 4: Specifications
& OPERATING MANUAL GUIDE TO METAL DETECTING Specifications Mechanical: 3-piece breakdown aluminum pole system, batteries under elbow, Armrest adjustment - forward/backward. Search coil: 9 3/4” open-frame waterproof concentric elliptical search coil. Batteries: 4 AA, alkaline (not included). Weight: 2 pounds 15 ounces (1.3kg), with alkaline batteries installed. Operating Principle: VLF induction balance Operating Frequency:... -
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 F70 starts out in the Discrimination mode, with presets at: Discrimination Level = 15 (iron eliminated) in both program-1 and -2. -
Page 6: Assembly Instructions
& OPERATING MANUAL GUIDE TO METAL DETECTING Assembly Adjusting the Armrest The armrest may be moved forward or backward by removing the single screw and nut, and then repositioning the 2-piece armrest. Users with shorter arms may find the armrest more comfortable in the forward position. - Page 7 Assembly (continued) Assembly is easy and requires no tools. Position detector upright. Rotate the LOCKING COLLAR fully in a counter clockwise direction. Insert your finger inside the tube and make sure the INTERNAL CAM LOCK is flush with the inside of the tube. Insert the MIDDLE STEM into the S- ROD.
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Page 8: Mechanicals
The locking collars must be rotated a full 270° to reach the locking position. HEADPHONES (not included) The F70 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 1/4” stereo plug should work;... -
Page 9: Introduction To The F70
F75, F4, and F2. Assisting John Gardiner were John Griffin, Dave Johnson, Mark Krieger, and Gerhard Staiger. MECHANICAL ENGINEERING While the F70 is robustly engineered for outdoor use, it is not indestructible and it is not waterproof. RESET function The F70’s microprocessor will save all settings which you input, even after the power is... -
Page 10: Controls
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 The F70 has six controls on the front panel. Frequency Shift... -
Page 11: Controls
Controls (continued) MENU button Push the MENU button to: Step through the menu selections on the display. With each push of the button, the next menu selection will be highlighted. The - or + buttons then allows you to change values for the highlighted selection. -
Page 12: Menu System
& OPERATING MANUAL GUIDE TO METAL DETECTING The Menu System The entire menu is printed on the LCD display. There are two search modes, Discrimination and Autotune. To select the Autotune mode: 1. Press MENU until the DISC LEVEL line of the menu system is highlighted. -
Page 13: Ground Balancing
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. Dissolved mineral salts, found in some soils, are electrically conductive, causing another type of interfering signal. - Page 14 & OPERATING MANUAL GUIDE TO METAL DETECTING Ground Balancing (continued) The range of ground balance settings indicated on the display range from 0 to 99. DIRT The DIRT bar graph on the LCD display indicates the amount of magnetic mineralization. The search coil must be in motion to measure mineralization.
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Page 15: Ground Balancing
Ground Balancing (continued) When ground balancing, try to “feel out” a spot on the ground to make sure there is no metal present. In order to avoid locking onto metal, the detector will not balance in DISCRIMINATION mode where the GROUND PHASE is less than 40. -
Page 16: Autotune Mode
& OPERATING MANUAL GUIDE TO METAL DETECTING Autotune Mode The Autotune 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 search coil must be in motion for objects to be detected. -
Page 17: Discrimination Mode
Discrimination Mode The Discrimination Mode is used to eliminate trash metal objects from detection, e.g. nails, aluminum foil, or pull-tabs. The search coil must be in motion for metal objects to be detected. In comparison to the Autotune mode, discrimination incurs some loss of sensitivity to small or deep objects. DISCRIMINATION LEVEL This is adjustable from 0 to 65, and controls the range of objects to be eliminated from detection (discriminated out or rejected). - Page 18 & OPERATING MANUAL GUIDE TO METAL DETECTING Discrimination Mode (continued) NUMBER OF TONES (# OF TONES) This menu selection allows you to select the number of audio tones emitted by the detector. Different search conditions, search objectives, or personal preference will determine how many tones you want to hear.
- Page 19 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. Inclusion or exclusion of target ranges is indicated with a crossed icon. To demonstrate how to set a notch, follow this instruction at first use.
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Page 20: 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 21: Lcd Visual Display
LCD Visual Display In normal operation, when the search coil 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. On a given buried object, the number will bounce around if the signal is weak or if the amount of ground mineralization is high. - Page 22 & 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 23 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 left-most segment will start flashing. Replace the batteries when the indicator flashes.
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Page 24: Frequency Shifting
If you suspect electrical interference, you may change the F70’s operating frequency. This is a trial and error method to try to find a frequency different from the suspected source. -
Page 25: Capabilities & Limitations
Capabilities and Limitations DEPTH The F70 can detect U.S. coins to a depth of up to 13-14 inches (35cm) 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 26: Capabilities & Limitations
SWEEP SPEED The F70 is noted for its quick response. It permits the user to sweep the search coil quickly in order to cover more ground with very little risk of losing targets. In general, if you are searching an area where the desirable targets are more than 8 to 10 inches deep, a faster sweep speed will detect to a greater depth and yield more accurate target IDs. -
Page 27: Search Techniques
PINPOINTING When you turn the F70 on, the ground balance setting is preset to give a positive response on nearly all soils. This means that if you holding the PINPOINT button, the audio tone will get louder as you lower the search coil to the ground. -
Page 28: Estimating Target Size, Depth, & Shape
& OPERATING MANUAL GUIDE TO METAL DETECTING Search Techniques (continued) ESTIMATING TARGET SIZE, DEPTH, AND SHAPE When Pinpoint is activated, 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. Flattened aluminum cans are usually identified as zinc, pennies or as dimes. -
Page 29: False Signals & Chatter
ID, the target is most likely iron even though the majority of the ID numbers will be greater than 12. The F70 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 F70’s enhanced see-through ability –... - Page 30 & 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 31: 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 F70 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 32: Tips On Ground Balancing
Search Techniques (continued) TIPS ON GROUND BALANCING When the F70 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 33: Detecting Activities
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. Sometimes there is jewelry present. -
Page 34: Relic Hunting
The ground balancing and DIRT bar graph features of the F70 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 35: Gold Prospecting
Detecting Activities (continued) Gold Prospecting In the United States, gold is found in many places in the western states, Alaska, and in a few localities in the Appalachians. The old saying "Gold is where you find it", means that to find gold, you should look in areas where the yellow metal is known to be present. -
Page 36: Cache Hunting
& OPERATING MANUAL GUIDE TO METAL DETECTING Detecting Activities (continued) Gold Prospecting (continued) Gold prospectors are mostly a friendly bunch, and willing to spend some time showing a beginner how to increase his odds of finding the yellow stuff. Many will invite you to search on their claims (if they have any) once they get to know you. -
Page 37: Shallow Water Hunting
Salt Water Hunting Salt water is highly conductive, and produces a strong signal which is like that of metal. The F70 is not specifically designed for top 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 38: How Metal Detectors Work
• Act as an ambassador for the hobby, use thoughtfulness, consideration and courtesy at all times. • Never destroy historical or archaeological treasures. • All treasure hunters may be judged by the example you set; always conduct yourself with courtesy and consideration of others Copyright Fisher Research Labs, Inc., 2011... -
Page 39: 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. -
Page 40: Accessories
Rugged double stitched construction. Includes handy exterior pocket for extra batteries or small accessories. 103693000C Fisher Stereo Headphones Use with Fisher metal detectors. Lightweight and adjustable with true stereo sound, adjustable volume, 1/8 jack with 1/4 adaptor, 4’ cable. 9720950000 Fisher Pin Pointer Pinpoints the exact location of buried metal objects.