Fisher Labs F75 Bedienungsanleitung

Metal Detector

Users Manual

The 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.

•Intuitive menu-driven user interface

•Large LCD screen

•Visual indicators of important values such as:

Target Identification

Target Confidence

Target Depth (both running-depth and pinpoint-depth)

Ground Mineralization

•Multiple Search Modes:

Discrimination

Static All-Metal

Motion All-Metal

•Trigger-actuated FASTGRAB™ground balancing with manual override

•Waterproof 11-inch open-frame BiAxial™ searchcoil

•Trigger-actuated target pinpointing with variable audio pitch

•Fully Adjustable Arm Rest

•Display backlight for night and low-light conditions

•Notch and discrimination controls

•Covers provided for both the control housing and battery box.

If you have any questions, or need assistance with your metal detector,

Call 1-915-225-0333, and ask for Fisher Hobby Technical Service

TABLE OF CONTENTS

Specifications………………………………………3

Quick-Start ……………………………………… 4

Mechanicals

Assembly Instructions ………………………….. 5

Mechanicals………………………………………6

Arm Rest adjustment …………………………… 6

Using Headphones (not included) ……………… 6

Introduction to the F75

General information ……..……………………… 7

Controls…………………..………………………8

Menu System..…………………………………... 9

Ground Balancing….………………………...10-12

Motion All Metal Mode …………………………13

Static All Metal Mode……………………………14

Discrimination Mode…………………………15-17

PinPoint Feature …………………………………19

LCD Visual Display…………………………20 –23

Numeric Target Identification ……………...20

Probable Target Identification……………... 20

Target Indicators ……………………………21

Depth Indicators……………………………..21

Confidence Indicator….……………………..21

Fe3O4Graph…………………………….........21

Battery Indicator …………………………….22

G.B………….………………………………..22

Settings………………………………….......22

Messages ……………………………….........22

Frequency Shifting ………………………………..23

Capabilities & Limitations…………………...24 -26

Tips & Techniques

Search Techniques

How to sweep the searchcoil ……………..27

Pinpointing targets ………………………. 27

Estimating target size and depth…………. 28

False signals and chatter….……………….29

Adjusting Sensitivity …………….……….31

Tips on ground balancing ……………...…32

Detecting Activities

Coinshooting…………………………….…33

Relic Hunting ….....................................33-34

Gold Prospecting…………………….…34-35

Cache Hunting……………………………..36

Shallow Water Hunting……………………36

Salt-Water Hunting ………………………..37

How metal detectors work……………………….37

Warranty …………………………….……………..38

SPECIFICATIONS

Mechanical: S-rod with electronics housing mounted on handgrip, 3-piece

breakdown, batteries under elbow, 2-way armrest adjustment —

forward/backward & around forearm.

Searchcoil: 11” (28 cm) open-frame elliptical double-D, waterproof.

Batteries:4 AA, alkaline (included).

Weight:3.5 pounds (1.6 kg) with alkaline batteries installed.

Static Balance: force in vertical plane normal to elbow 0.47 pounds (0.22

kg).Varies with adjustment and user’s stance and arm/hand

physiology.

Dynamic Balance: axial moment, 0.29 foot-pounds (0.39 newton-meters). Varies with

adjustment and user’s stance and arm/hand physiology.

Sweep Effort:lateral moment 5.2 foot-pounds (7.1 newton-meters).

Operating Principle:VLF induction balance

Operating Frequency:nominal 13 kHz, quartz crystal timing reference

Basic Sensitivity:6 x 109 root Hertz (detectivity)

Lag Coefficient: 78 milliseconds

Reactive Overload:approximately 10,000 micro-cgs units (volume susceptibility)

40,000 micro-cgs units with sensitivity < 30.

Resistive Overload: approximately 1,200 micro-cgs units (volume susceptibility)

4,800 micro-cgs units with sensitivity < 30.

Ground Balancing

Range:From ferrite to salt, inclusive

Discrimination

Ground Suppression:combination of second and third order methods

ID Ground

Suppression:third order

Battery Life:typically 30 hours with high quality alkalines, somewhat less with

rechargeables.

Operating

Temp Range:4 to +122 degrees F (-20 to +50 degrees C)

Operating

Humidity Range:0-90% non-condensing

QUICK START

Use your F75 right out of the box

1. Assemble the detector (see instructions beginning page 4).

2 Install four AA alkaline batteries. All positive (button-end) terminals point up.

Batteries are included with the detector.

3. Turn the knob, located under the armrest, fullyclockwise.

This turns the machine on and sets audio volume to maximum.

4. When first turned on, the F75 starts out in the Discrimination mode, with:

Sensitivity preset to 60

Discrimination Level preset to 10

Number of Tones preset to 3

Process# preset to dE

Sweep the searchcoil from side to side, parallel to the ground. Keep the searchcoil

moving over the ground. If you stop moving the searchcoil, the sound will also

stop. Probable target typewill be indicated at the top of the LCD screen.

5. If the searchcoil is not in motion and not close to metal, the detector should be

silent.

6. If you experience false signals from electrical interference, from the soil itself, or

from lots of trashmetal, press the MENU button.

Sensitivity will be highlighted.

Rotate the Settings knob to the left (counterclockwise),

Reduce the sensitivity setting until the false signals go away.

After 7seconds, the machine will exit the menu and return to

normal operation.

7. Toss a coin on the ground and sweep back and forth over it a few times to get a

feel for how the machine responds.

8. You are now ready to search.

9. Pull the trigger switch with your index finger to pinpoint the exact location 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 approximate target depth, in inches.

ASSEMBLY

1. Remove all components from box.

2. Attach searchcoil to lower rodby lining up the holes.

Notice that the lower rod is supplied with only one rubber washer.

It is designed to work with only one washer for maximum stability.

Push coil knobthrough hole and tighten knob gently.

You will tighten up the coil knob later.

3. Insert smallestrodinto S-rod(S-rod holdsdetector body).

Turn top locking collarcounter-clockwise to open up.

Push in pinon small rod.

Slide small rod into upper rod.

Click pin into hole and tighten locking collar firmly clockwise.

4. Push lower rodinto small rodas follows:

Turn locking collar counterclockwise to open up.

If plastic insert tab interferes, push it down, or turn tube upside down.

Push in pin to allow rod to slide in.

Slide lower rod in.

Click pin into any hole.

5. Remove velcro strip from lower rod.

6. Wrap cable around stem as follows:

Leave some slack in cable at base of lower rod.

Secure cable at base of rod with velcro strip.

Wrap cable loosely around entire stem up to bent part of upper rod.

You will re-wrap the cable later after sizing the rods to your height.

7. Push cable into connector on back of housing.

Do not twist the cable or plug.

Turn knurled cap nut only. Do not cross thread.

8. Tighten knurledcapnut by hand to secure cable connection to housing.

Do not twist the cable or plug.

9. Adjust to your height:

Hold detector, standing up, with your arm in the armrest.

Place searchcoil flat on the ground with back edge of coil 6” in front of your

toes.

Click pin on lower rod into nearest hole.

Firmly tighten bottom locking collarto secure lower stem.

10. Attach cable to top of rod with upperVelcro strip

11. Tightenup coil knob to keep searchcoil from flopping.

12. Insert batteries.

4 batteries are all installed the same way -- positive terminals pointed upward.

After establishing a comfortable length, firmly tighten the locking collars on the rods to

prevent the tubes from rattling. Rotate the collars a full 270° to engage and lock in place. If

you are unable to rotate a full 270°, use gloves for a better grip.

If the searchcoil appears crooked with respect to the pole, loosen both locking collars and

re-adjust. Hold each of the lower polesin the counterclockwise position as you tighten the

locking collars.

MECHANICALS

BATTERIES

The F75 required 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” batteries may not work, especially in cold weather.

Do not use these batteries.

Expect 30 hours of service in the field with one set of alkaline batteries.

Rechargeable batteries will usually deliver over 25 hours of service without recharging, but

when they start running low, they die suddenly with little warning.

Always install batteries which are of the same type and the same state of charge.

Otherwise battery life will be determined by the weakest battery, because the good batteries

cannot deliver their power with a dead battery blocking the current.

All 4 batteries are installed with the positive terminals facing upward.

The LCD screen shows battery condition on the right.

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. For a very secure fit, some users prefer to bend

the arm rest in tightly against the forearm such that you pry the sides loose each time you

place your arm into the arm rest.

Arm Rest Position on Pole : Remove the two bolts to position the arm rest farther forward or back,

to adapt to your arm’s length.

-- To reinsert the bolts, spin and twist them into place. Be careful not to damage

the power cable that runs through the aluminum tube.

-- Insert both bolts completely through both sides of the bracket

before attaching the nut to the opposite side.

-- After reinserting the bolts, tighten them very securely. You may need to use

gloves for a firm grip. As you swing the detector from side-to-side, you want the

bolts tight enough so that you do not feel anymovement between the pole and

arm rest mounting bracket.

If you notice unwanted movement while swinging detector, check the tightness

of the locking collars.The locking collars must be rotated a full 270° to reach the

locking position.

HEADPHONES (not included)

The F75 is equipped with a standard ¼-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 ¼” stereo jack should

work. Mono headphones will not work.

Using headphones improves battery life, and prevents the sounds from annoying bystanders. It also

allows you to hear subtle changes in the sound more clearly, particularly if searching in a noisy

location. For safety reasons, do not use headphones near traffic or where other dangers, like

rattlesnakes, are present.

Introduction to the Fisher F75

HIGH PERFORMANCE The F75 is a multi-purpose high-performance computerized

metal detector. It has the high sensitivity and ground balancing controlneeded 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 F75comes 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 foamelastomer,

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 The entire menu is always visible on

the 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 bottomof the display when necessary.

LOW OPERATING COST The F75 is powered by four AA alkaline batteries, which will

typically last for more than 30 hours of use before needing replacement.

lead engineerson the F75design 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. David was supported by fellow electrical engineers

Jorge Corral, Dimitar Gargov, 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 will save 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.

CONTROLS

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

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.

Witheach push of the button, the next menu selection will be highlighted.

The SETTINGS knob then allows you to change values for the highlighted

selection.

2. Recall the last setting which you adjusted.

After you have adjusted a setting, an indicator will remain highlighted next to this

menu selection. One push of the button will recall that selection and display the

stored value.

This recall function is useful for a value you want to adjust frequently, such as the

ground balance setting.In order to adjust a stored value with the SETTINGS

knob, you must first press the MENU buttonto reactive the user interface.

SETTINGS Knob (On the left of the front panel)

Rotate the SETTINGS knob to:

1. Change the setting (or value) of the highlighted menu selection you have chosen.

2. Select the operating MODE when the top line of the menu is highlighted.

When used to switch back and forth between the DISCRIMINATION mode and

ALL METAL modes, the detector changes modes as soon as the corresponding

selection is highlighted. The All Metal modesare used to detect all metal objects,

including small or deep objects. Use the Discrimination mode to ignore trash metal

such as nails, foil, or pull-tabs.

NOTE: When the menu selection highlight disappears, the SETTINGS knob is

deactivated. If settings values do not change when the SETTINGS knob is rotated, press

the MENU button to reactivate the user interface.

TRIGGER SWITCH (Under the displayin front of your hand)

While the trigger is pulledback, metal objects are temporarily detected without the need

for searchcoil motion. This aids in pinpointing the exact location of objects which were

found while searching in the Discrimination or All Metal modes.

When the trigger is pushedforward, 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 in the ground. After the detector measures

the soil in this manner, the detector thenuses this information to control operation in both

the All Metal and Discrimination search modes.

THE MENU SYSTEM

The entire menu is printed on the LCD display. The display highlights the mode and

settingswhich are in use.

There are three search modes, Static All Metals, Motion All Metals, and Discrimination.

To change between an All Metals modes and Discrimination mode, the top line of the

menu system must be highlighted. Press the MENU button until the top line of the menu is

highlighted. When either All Metal or Discriminationis highlighted, rotate the

SETTINGS knob to move between the two categories.

Each search mode has severaladjustable function settings:

ALL METAL: Threshold, Audio Pitch, Sensitivity, and Manual Ground Balance

DISCRIMINATION: Sensitivity, Discrimination Level, Notch, Number of Tones, and

Process Number.

To select a function, push the MENUbuttonand continuepushing in order to move to the

function you want. The word SETTING will pop up in the middle of the display,and the

present setting of that function will be displayed as a number.

To change asetting, rotate the knob.

To increase a value, rotate to the right (clockwise)

To decrease a value, rotate to the left (counterclockwise)

If you select a function and do not make a change to that function after 7seconds, the

detector will exit the menu system automatically, deactivate the SETTINGS knob, and

resume normal operation.

If you press the MENU button while the machine is in normal operation, the user interface

will return to the last menu feature setting.This feature allows you to have quick access to

a function that you want to adjust frequently.

GROUND BALANCING

What is Ground Balancing?

All soils contain minerals. Signals fromground 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.

Ground Balancing is the process by which the metal detector cancels the unwanted ground

signals while leaving signals from buried metal objects intact. This is accomplished by

establishing the detector’s internal Ground Balance setting; this setting is calibrated to the

soil and eliminates the signal produced by ground minerals.

Calibration to the actual soil conditionwill result in deeper target detection, quieter

operation, and more accurate target identification. This calibration, or Ground Balancing,

can be accomplished automatically withthe detector’s internal computer, by pushing the

Trigger Switch forward, or manually in the All Metal menu.

The ground balance setting carries through into all operating modes. In Discrimination

mode, the ground signal is generally inaudible unless the discrimination setting is 0.

AUTOMATIC GROUND BALANCING PROCEDURE (FASTGRABTM)

1. Find a spot of ground where there is no metal present.

2. Hold the detector with the searchcoil about one foot above the ground.

3. Push the TRIGGER SWITCH forward with your index finger.

4. Physically pump the searchcoil and detector up and down over the ground.

Lift it about 6 inches above the ground and lower it to within 1 inch of the

ground, about once or twice a second.

5. A 2-digit value will appear on the display. This is the Ground Balance setting.

If the detector’s internal computer is unable to ground balance, an error

message will appear:

• If the message OVERLOAD RAISE COIL –CAN’T GB appears, you

will also hear a siren sound.You are probably over metal.

• If the message CAN’T GB appears, you may not be pumping the coil, or

you may be over a small piece of metal.

Note: FASTGRAB will not automatically balance over highly conductive soils,

such as a wet salt water beach.

MANUAL GROUND BALANCING

In most situations, it is preferable to pushthe trigger switch to activate FASTGRAB

automatic ground balancing. Generally, it is best to first let the computer automatically

cancel interference from ground minerals. However, for gold prospecting, searching on a

wet saltwater beach, or searching in an area with so much metal trash that there is no clean

ground for the computer to sample, we recommended that you manually ground balance.

Manual ground balancing requires a bit of skill, acquired with some practice.

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 settingschange with each step; there are a total of 500 different settings.

Under some ground conditions you may be able to hear the individual steps in the setting.

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