Fisher Research Labs F4 Operating Manual
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Fisher Research Labs F4 Operating Manual

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OPERATING
MANUAL

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  • Page 1 OPERATING MANUAL...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Terminology ........3 Assembly .

  • Page 3: Terminology

    TERMINOLOGY The following terms are used throughout the manual, and are standard terminology among treasure hunters. ELIMINATION Reference to a metal being "eliminated" means that the detector will not emit a tone, nor light up an indicator, when a specified object passes through the searchcoil’s detection field.

  • Page 4: Assembly

    Caution: Forcing in MIDDLE STEM with CAM LOCK raised may form a burr on camlock. If this happens, remove burr with knife to allow insertion. ASSEMBLY Position detector upright. Rotate the LOCKING COLLAR fully in the counterclockwise direction. Insert your finger inside the tube and make sure the INTERNAL CAM LOCK is flush with the inside of the tube.

  • Page 5: Batteries

    BATTERIES Two 9-Volt batteries are supplied with the F2. The batteries have been inserted backwards in the compartment for storage during transportation. Please remove batteries, turn them around, and install correctly. Use ALKALINE batteries only. DO NOT MI X OLD AND NEW BATTERIES.

  • Page 6: Quick-Start Demo

    QUICK-START DEMONSTRATION I. Supplies Needed • A Nail • A Quarter • A Pull-Tab from a beverage can • A Zinc Penny (dated after 1982) • A Nickel II. Position the Detector a. Place the detector on a table, with the searchcoil hanging over the edge.
  • Page 7 QUICK-START DEMONSTRATION (continued) VI. Wave the Nail over the Searchcoil a. The Nail will not be detected. b. The Nail has been "Discriminated Out." VII. Press the “DISCRIMINATION +” touch pad 3 times. Five “R”s are now displayed. VIII. Wave all objects over the Searchcoil The Nail and Pull-Tab will not be detected.

  • Page 8: Control Panel

    CONTROL PANEL The operating controls are as follows: SENSITIVITY + ND – These controls change the detector’s sensitivity; higher settings enable detection of deeper targets. At power- up, the detector is pre-set to 75% of maximum sensitivity. At minimum, the sensitivity is 35% of maximum.

  • Page 9: Discrimination Control

    CONTROL PANEL (continued) – DISCRIMIN TION (THRESHOLD) + ND The function of this control depends upon the operating mode you are in before you press these touch pads. AUTO TUNE + and – will change the threshold sensitivity of This Threshold the detector in this mode.

  • Page 10: Pinpoint

    CONTROL PANEL (continued) PINPOINT This is a static search and static pinpointing mode; no coil motion over the target is required to detect metal. This mode is most effective in pinpointing the exact location of small buried objects. The detection sensitivity of this mode is controlled by the SENSITIVITY + or –...

  • Page 11: Notch

    CONTROL PANEL (continued) As you sweep the searchcoil over a metal object, a numeric target identification will appear in the center of the display. At the same time, the bar graph on the left of the display will indicate the target depth, in inches. See the scale printed on label to left of the bar graph.

  • Page 12: Ground Balancing

    GROUND BALANCING What is Ground Balancing? Why do I need to Ground Balance? 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.

  • Page 13: Quick Ground Balancing

    GROUND BALANCING (continued) 7. Notice that the position of the KNOB affects the sound relative to the coil’s direction: a. If you hear a louder sound as the searchcoil is lowered toward the ground, we call this positive response. b. If you hear a louder sound as the searchcoil is lifted away from the ground, we call this negative response.

  • Page 14: 4-Tone Audio System

    4-TONE AUDIO SYSTEM While the LCD (Liquid Crystal Display) is very accurate in identifying buried objects, the user in the field does not always maintain the display screen in his field of vision. Therefore, we have incorporated an audio feedback mechanism to alert the user to the nature of buried objects.

  • Page 15: Depth And Target Display

    DEPTH AND TARGET DISPLAY RE DING THE DISPL Y Medium-sized gold items will register The Liquid Crystal Display (LCD) shows the under PT or S-cap. PROBABLE identification of the targeted Large gold items will register under S- metal, as well as the PROBABLE depth of the cap or Zinc.

  • Page 16: Target Readout Table

    Caution: The target indications are below. visual references. Many other types of metal can fall under any one of these categories. While the F4 will eliminate or indicate the presence of most common trash items, it is impossible to accurately classify ALL buried objects.

  • Page 17: Dd Coil Characteristics

    DD COIL CHARACTERISTICS A DD coil is superior to a concentric coil, but sometimes requires a different sweep technique. Advantages are Better target separation Superior performance in highly mineralized ground Broader Sweep- cover more ground with each sweep If you experience multiple responses on a shallow target, you can raise the coil, or narrow the sweep over known targets to only intersect the center section of the coil.

  • Page 18: Sensitivity Adjustment

    1. REDUCE the SENSITIVITY until the chatter stops. 2. Try sweeping it over the ground. If the F4 chatters while held still, or held up in the air, it may be much quieter when sweeping over the ground. 3. Operate in AUTOTUNE Mode Interference is much more tolerable in this mode, even at high sensitivity.

  • Page 19: Search Techniques

    SEARCH TECHNIQUES (in DISC Mode) Target Verification After detecting a target, do the WRONG following: 1. Walk around the target in a circle. 2. While circling the target, continue sweeping the searchcoil across the target. 3. Sweep once every 30° or 40° of CORRECT the circle.

  • Page 20: Target Pinpointing (No Motion)

    TARGET PINPOINTING (no-motion PINPOINT Mode) After you have identified a target using a motion mode of detection, press the PINPOINT pad to identify the target’s exact location. This technique can yield more information about the target’s shape and size and also find its exact location to facilitate excavation.

  • Page 21: Treasure Hunter's Code Of Ethics

    For details, visit www.fisherlab.com FREE DETECTOR. The F4 metal detector is warranted against defects in materials and workmanship under normal use for five years from the date of purchase to the original owner. Damage due to neglect, accidental damage or misuse of this product is not covered under this warranty.
  • Page 22 NOTES...
  • Page 23 NOTES...
  • Page 24 MF4B Rev.5 040215...

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