Fisher F75 SPECIAL EDITION User Manual page 10

F75
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Comprehensive Operating Manual & Guide to Metal Detecting
Introduction to the Fisher F 75
HIGH PERFORMANCE The F75 is a multi-purpose high-performance computerized metal
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.
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.
USER COMFORT The F75 is among the lightest and best balanced of all high-performance
metal detectors, so you can hold and swing it almost effortlessly. The arm rest position is
adjustable to fit your arm. The grip is durable high-friction foam elastomer, comfortable in
any kind of weather. The controls are conveniently located and easy to learn how to use.
Locking collars on the tubes eliminate rattling.
EASY-TO-USE & INFORMATIVE INTERFACE
LCD display. The LCD display indicates the electrical signature (target I.D.) of the
detected metal object. The display provides continuous information on battery condition
and on ground mineralization, which affects detection depth. Help messages are
automatically displayed on the bottom of the display when necessary.
LOW OPERATING COST The F75 is powered by four AA alkaline batteries, which will
typically last for more than 40 hours of use before needing replacement.
DESIGNED BY MANY OF THE INDUSTRY'S MOST TALENTED ENGINEERS
The lead engineers on the F75 design team were John Gardiner and David Johnson.
David Johnson's previous Fisher design credits include the CZ-platform, the Gold Bug-
series, most of the 1200-series, Impulse Underwater Detector, CZ-20 Underwater
Detector, FX3 magnetometer, the Gemini 2-box locator, the XLT-16 Acoustical Leak
Detector, and the XLG-80 Ultrasonic Leak Detector. John and David were supported by
fellow electrical engineers Jorge Corral, and Mark Krieger. The mechanical design was a
collaboration among David Johnson, Brad Fulghum, John Griffin, and Tom Walsh.
MECHANICAL ENGINEERING
While the F75 is robustly engineered for outdoor use, it is not indestructible and it is not
waterproof.
RESET function
The F75's microprocessor saves all settings which you input, even after the power is
turned off.
If you wish to reset the settings to the factory preset, follow this process:
1. Turn detector off.
2. Press-and-hold the red MENU button and
push-forward-and-hold the TOGGLE SWITCH.
3. Turn the detector on, while you are still holding the controls.
4. Release the MENU button and TOGGLE SWITCH.
5. See the F symbol. When the F disappears, the detector is reset.
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The entire menu is always visible on the
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. Sometimes there is jewelry present. You will
usually search using discrimination to get rid of the iron and the
aluminum trash, even though this mode will cause you to miss some of
the jewelry.
Much coinshooting is done in lawn areas, where digging holes
would cause damage to the grass. We recommend use of an
accessory hand-held pinpointer in such cases. Recovering targets is
usually done by first accurately pinpointing the target, then carefully cutting
a slit in the turf with a knife, and tamping it firmly when you are finished. In
these situations, you cannot recover deep targets for fear of damaging the
turf, so you can cut down on nuisance signals by reducing the sensitivity.
When searching on private property, first get the permission of
the property owner. Most of the public places where one is
likely to do coinshooting are city, county, or school district
property. There is usually no ordinance prohibiting use of
a metal detector as long as you are not causing damage.
Sometimes such ordinances do exist. Administrators and
security personnel often have the legal authority to
prohibit any activity they do not like even if there is no
ordinance against it. If there is a metal detecting club in your
area, someone will usually know what areas can and cannot
be searched. If you are ever in doubt about hunting an
area, then ask before hunting.
Be prepared to always put your best foot forward
when using a metal detector in a public place. Pick
up any trash you recover; put it in a pouch or pocketed
apron. This way you can explain that you are performing
a public service by helping keep the place free of trash,
especially pieces of metal or glass that could endanger a child at
play. Be proficient at recovering targets without causing
damage to the lawn. Explain that whenever you find jewelry
which has personal identification marks, such as a class
ring, you make an attempt to determine the owner and to
return it. When someone who questions what you are
doing understands that you are causing no damage and are
actually performing a public service, you will usually be
welcome.
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