Fisher F75 SPECIAL EDITION User Manual Download Page 22

Comprehensive Operating Manual & Guide to Metal Detecting

Comprehensive Operating Manual & Guide to Metal Detecting

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F75

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F75

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Discrimination Mode (continued)

4:

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.

dP: DELTA PITCH  This setting produces a tone whose pitch varies in relation to the visual ID

number -- the higher the ID, the higher the pitch. Good for relic hunting. This setting is
also useful in areas with a high concentration of steel bottle caps. Coins will produce a
fairly constant pitch as you sweep back and forth.  Bottle caps produce inconsistent
tones, often with a squawk at the beginning of the sound.

Process Number (Process #)
This menu selection offers the user a choice among several different methods of audio
discrimination to accommodate a variety of search conditions and personal preferences.
These methods differ in the way the signals are processed for analysis.

The Process Number selections are:

dE: DEFAULT PROCESS 

This is the best process to use for most conditions, and is thus the default.

JE: JEWELRY PROCESS

Detector will be more sensitive to small and low-conductivity metals like jewelry, but will
run noisier in trashy areas.

bc: BOTTLE CAP MODE 

Response is modified so that steel bottle caps will usually produce inconsistent, or non-
repeatable, tones and broken sounds. There may be a slight reduction in the ability to
separate adjacent targets.  Use this process in areas with a high concentration of steel
bottle caps. Also refer to the Capabilities & Limitations section for sweep techniques to
aid in the identification of steel bottle caps

PF: for use in plowed fields.

Some users may prefer this process for hunting in irregular ground, especially plowed
fields.

bP: BOOST PROCESS

This process is an enhanced sensitivity version of the dE (default) process. It is
particularly useful when searching for deep targets in a non-trashy area, or on a site
where vegetation makes it necessary to raise the searchcoil several inches above the
surface of the ground.  It will also produce excellent results on trashy sites provided that
you slow down your sweep speed; sweep the coil slower than you would when using the
Default process. When the Boost process is selected, the response characteristics of
the Motion All Metal Mode are also modified; these characteristics include less noise and
a slower response speed. 

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. If using NiMH
rechargeable batteries, the display will remain stuck on the second or third bar for most of the
battery life; when it drops to the first bar, the batteries will go dead within several minutes.

G.B.
This is the ground balance setting, 0-99.  It is displayed when in the Manual G.B. menu
setting, or when the trigger is pushed for FASTGRAB computer-assisted ground balancing.

SETTING 
This is illuminated when you are in the menu.  When the word “SETTING” is indicated, the
number being displayed is a setting, and not, for instance, a Target ID indication.

MESSAGES 
The small rectangular box at the bottom-center of the LCD displays advisory messages.

If a metal object or highly magnetic soil is so close to the searchcoil that the signal is
overloading the circuit, the message OVERLOAD - RAISE COIL will appear.
Such overloads will not harm the detector, but the detector will not detect metals properly
under these conditions. Raise the coil until the message disappears; the siren sound will also
stop. Resume normal detection.

The message RAISE COIL only appears when using the bc process, accessed through the
PROCESS # menu selection. This message indicates the presence of a target which may be
too close to the searchcoil to be accurately identified. For better target identification, sweep
the searchcoil farther away from the surface of the ground.

The message PUMP COIL TO GB will appear when you push the trigger forward to ground
balance.  See the Ground Balance section of this manual for instructions. 

The message CAN’T GB can only appear when the trigger is pushed forward, invoking
FASTGRAB automatic ground balancing.  This message appears when the detector is unable
to measure the soil in a manner suitable for ground balancing. This message is usually the
result of the presence of metal. Try another spot to find an area free of metal.

BACK LIGHT
The LCD is back-lighted for use in low light and dark conditions.
The backlight is always illuminated, but the illumination is usually not evident in daylight.
You cannot turn the backlight off. The single high-efficiency light emitting diode providing the
illumination is a low current device, and has a negligible impact on battery life. 

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Summary of Contents for F75 SPECIAL EDITION

Page 1: ...al Sand Scoop Large galvanized metal scoop with filtering holes Strong Rubberized grip SAND SCOOP Lesche Knife Made from high quality heat treated tempered steel The ultimate digging tool Comes with a...

Page 2: ...neglect accidental damage or misuse of this product is not covered under this warranty Decisions regarding abuse or misuse of the detector are made solely at the discretion of the manufacturer Proof o...

Page 3: ...ng targets 33 34 Estimating target size and depth 34 35 False signals and chatter 35 Adjusting Sensitivity 37 Tips on ground balancing 38 Detecting Activities Coinshooting 39 Relic Hunting 40 41 Gold...

Page 4: ...oop contains two electrical induction coils which are like antennas One coil transmits a rapidly alternating magnetic field illuminating the region surrounding the searchcoil If metal is present its e...

Page 5: ...cation of targets making them easier to unearth When the trigger is pulled PinPoint is engaged The searchcoil need not be in motion to detect an object The 2 digit numeric display indicates approximat...

Page 6: ...the circumstances surrounding the hiding of the cache you may find discrepancies which help you to judge the reliability of the information available Often the best information on an old cache is to...

Page 7: ...the searchcoil slowly and deliberately carefully controlling its height above the ground to minimize noise from iron minerals in the soil If you hear ground noise your Ground Setting could be a bit o...

Page 8: ...is a historical society and museum of local history Most museums are grateful for anything they can put on display and when you dig something you cannot identify the curator can often identify it for...

Page 9: ...nued 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 house...

Page 10: ...ings 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 t...

Page 11: ...ed to ground balance so find another promising spot and try again If you cannot find a spot to successfully ground balance it is time to give up Reset the ground setting to 90 and then use the machine...

Page 12: ...is pushed forward FASTGRAB automatic ground balancing is activated The internal computer measures the magnetic properties of the soil in order to cancel interference from naturally occurring minerals...

Page 13: ...ll sometimes not be completely eliminated even when the discrimination setting should have eliminated the target Metal detectors are designed to see one metal object at a time Where there are two iron...

Page 14: ...fficulty properly identifying steel bottle caps and the F75 is no exception Steel bottle caps will often read in the coin range at the high end of the scale The ID number you receive from a buried coi...

Page 15: ...rget and the sound will indicate the target s location As you sweep from side to side and hear no sound at the ends of the sweep the target is located in the middle of that zone where the sound is lou...

Page 16: ...get can be very short especially in a trashy area The Boost process lengthens the duration of the target s sound Many users will find this audio feedback less fatiguing the Boost process makes it easi...

Page 17: ...CE Manual Ground Balance can only be performed while in an All Metal mode but the resultant setting will carry over if you change into Discrimination mode See the previous section on Ground Balancing...

Page 18: ...EEL 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 a...

Page 19: ...n any range the slash will appear even though all values within that range might not be eliminated from detection To recall the discrimination setting press the MENU button until you enter the DISC LE...

Page 20: ...s 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...

Page 21: ...refer this selection 3H same as 3 except that nickels produce a high tone 3 THREE DIFFERENT AUDIO TONES Iron produces a low pitch tone Aluminum trash zinc pennies and nickels produce a medium tone Hig...

Page 22: ...ll Metal Mode are also modified these characteristics include less noise and a slower response speed LCD Visual Display continued BATTERY CONDITION INDICATOR Fresh alkaline batteries will illuminate a...

Page 23: ...tate pinpointing an object the 2 digit numerical display indicates the approximate depth of the object in inches based on the assumption that the object is a typical U S coin Small objects will read d...

Page 24: ...ried 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 mini...

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