Fisher Research Labs F75 Special Edition User Manual Download Page 1

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Comprehensive Operating Manual & Guide to Metal Detecting

M75MBLK

Rev. 4

100714

Better performance in High-E.M.I. environments.

Even better target separation!

F75ltdBLK-MANUAL.qx6_M75MBLK-Manual 10/7/14 4:28 PM Page 1

F75

SPECIAL EDITION

Metal Detector

User’s Manual

Summary of Contents for F75 Special Edition

Page 1: ...0714 Better performance in High E M I environments Even better target separation SPECIAL EDITION Metal Detector User s Manual...

Page 2: ...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 A...

Page 3: ...able Target Identification 25 Depth Indicators 26 Confidence Indicator 26 Fe3O4 Graph 26 Battery Indicator 27 G B 27 Setting 27 Messages 27 Frequency Shifting 28 Capabilities Limitations 29 31 Tips Te...

Page 4: ...nal 13 kHz quartz crystal timing reference 13158Hz 13100Hz 13043Hz 12987Hz 12931Hz 12876Hz 12821Hz Basic Sensitivity 6 x 10 9 root Hertz detectivity Lag Coefficient 78 milliseconds Reactive Overload a...

Page 5: ...ground If you stop moving the searchcoil the sound will also stop Probable target type will be indicated at the top of the LCD screen 6 If the searchcoil is not in motion and not close to metal the d...

Page 6: ...e the MIDDLE STEM until the SILVER BUTTON locates in the hole 6 Twist the LOCKING COLLAR fully in the clockwise direction until it locks 7 Repeat this process on the LOWER STEM 8 Using the BOLT and KN...

Page 7: ...the Cable or Plug Turn Locking Ring only Use minimal finger pressure to start the threads Do not cross thread When the Locking Ring is fully engaged over the threaded connector give it a firm turn to...

Page 8: ...le 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 t...

Page 9: ...As you swing the detector from side to side you want the bolts tight enough so that you do not feel any movement between the pole and armrest mounting bracket If you notice unwanted movement while sw...

Page 10: ...etal 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 d...

Page 11: ...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 On Off Volume Switch Menu Access...

Page 12: ...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 high...

Page 13: ...DISCRIMINATION Sensitivity Discrimination Level Notch Number of Tones and Process Number To select a function push the MENU button and continue pushing in order to move to the function you want The wo...

Page 14: ...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...

Page 15: ...an 40 manual ground balancing is required To perform the Manual Ground Balancing operation do the following 1 Select the MANUAL G B function The legend G B SETTING appears The present ground balance s...

Page 16: ...a metal object Ground Balancing continued Se The resu tras find tras lead slow The the drift ordi if yo dete In a pred aga the prod usin Mos sele also Wh proc fam con mar the und Pin Wh nea loud just...

Page 17: ...ries over to Static Mode and Discrimination Mode SENSITIVITY This controls the signal gain and is adjustable from 1 to 99 In the presence of electrical interference high ground mineralization or varia...

Page 18: ...om background noise and or a slight amount of ground response If you do not hear these noises you will sacrifice detection depth If the background chatter is too annoying or the ground noise is so hig...

Page 19: ...d to adjust to a setting of 29 or less to silence electrical interference or to prevent overload on highly mineralized ground or in saltwater You may also notice a shift in the ground balance setting...

Page 20: ...nge TAB range is from 36 to 55 will be eliminated from detection 6 A half slash will be permanently displayed across the top left of the word TAB NOTCH allows you to select target ranges equal to 1 2...

Page 21: ...e 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 o...

Page 22: ...sponds with a faster shorter audio duration This improves target separation dE DEFAULT PROCESS This is the best process to use for most conditions and is thus the default JE JEWELRY PROCESS Detector w...

Page 23: ...ache Locating process in the Discrimination Mode Audio Pitch To change Audio Pitch choose this selection under the All Metal Menu see pg 17 instructions WHAT YOU SEE VS WHAT YOU HEAR The visual Target...

Page 24: ...target How to Pinpoint 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 soun...

Page 25: ...U S 1 Eagle OBJECT TARGET ID Most iron objects 4 12 foil from gum wrapper 16 25 U S nickel 5 coin typically 30 aluminum pull tab 33 55 aluminum screwcap 60 70 zinc penny dated after 1982 typically 60...

Page 26: ...igit target identification it has assigned If all 6 segments are displayed you can be confident that the Target ID is accurate If 3 or fewer segments are displayed the confidence is very low Junk targ...

Page 27: ...ISE 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...

Page 28: ...riencing electrical interference If you suspect electrical interference you may change the F75 s operating frequency This is a trial and error method to try to find a frequency different from the susp...

Page 29: ...ty alloys such as iron bronze brass lead pewter and zinc will read lower on the effective conductivity scale Larger objects and objects made from higher conductivity alloys such as silver copper and a...

Page 30: ...etector without sweeping it over the ground for instance if not fully assembled or if you are indoors To air test place the searchcoil in a spot where the detector is stable and more than two feet awa...

Page 31: ...lds of the Double D construction can produce anomalous responses If the object feels shallow strong signal narrow response or multiple responses in a single sweep and is giving consistent high reading...

Page 32: ...oil until the overload warning disappears and sweep at this increased height Large Targets If an overload warning is not confined to a small spot you are probably overloading on a large object for exa...

Page 33: ...nes or by lengthening the duration of good sounds that were too hard to hear amid trash sounds old sites are again productive If a site has been especially productive in the past you may want to revis...

Page 34: ...coil higher and higher If the response diminishes quickly and never gets very broad the target is probably a coin If the response diminishes slowly as you lift the searchcoil and you get a broad respo...

Page 35: ...ferrous targets in the proximity of iron indicating ID numbers higher than would be obtained in an air test This tendency is connected with the F75 s enhanced see through ability that is the ability t...

Page 36: ...ther digging them since nonrepeating signals are almost always trash GROUND MINERALS Conductive mineral salts usually produce broad signals which will not be mistaken for a metallic object Common caus...

Page 37: ...gold nugget and are common in many gold prospecting areas They are usually but not always drawn to a magnet They are most often reddish in color but are often black brown or yellow On relic hunting s...

Page 38: ...he machine without ground balancing In most areas once you have ground balanced the ground balance setting will remain satisfactory for a long time However if the soil has been disturbed by digging or...

Page 39: ...mission 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 dete...

Page 40: ...egal Certain kinds of sites on both public and private land are protected by law from relic hunting If there is a metal detecting club in your area some of the members will probably know what the laws...

Page 41: ...es 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 Hillsides...

Page 42: ...te black sand If you know this to be the case in the area you re working you can maximize your gold recovery by concentrating your effort on areas where the bar graph indicates higher amounts of iron...

Page 43: ...and sometimes it belongs to the person who finds it or some combination of the above If the contents of the cache were stolen this fact can also complicate the question of ownership Find out what law...

Page 44: ...lenges You may get false signals when going into and coming out of the water making it necessary to pay careful attention to keep the coil either in or out of the water but not to touch the surface Th...

Page 45: ...these tasks in software running on an internal microcomputer The iron minerals which are present in most soils also distort the magnetic field obscuring the weak signals of small or deep objects This...

Page 46: ...care to refill all holes and leave no damage Remove and dispose of any and all trash and litter found Appreciate and protect our inheritance of natural resources wildlife and private property Act as a...

Page 47: ...bs 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 1465 Henry Brennan Dr El Paso TX 79936 Pho...

Page 48: ...Comprehensive Operating Manual Guide to Metal Detecting F75 SE B M75MBLK Rev 4 101514...

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