Metal Detector
(630-3013)                 Operation                  Faxback Doc. # 63884

A Quick Look at Your Metal Detector's operating controls.

              MODE - lets you select from OFF, VLF, TR1, TR2.  (See 
                     "Turning On the Detector" below.

            GROUND - Compensates for false signals from mineralized soil.  
                     (See "Adjusting Ground" below.)

            VOLUME - lets you adjust the volume of alert tones.

    DISCRIMINATION - lets you adjust the metal detector's ability to 
                     distinguish between different types of metal.  (See 
                     "Adjusting Discrimination" below.)

      Analog Meter - Shows strength of signals being received by the metal

LOW BATT indicator - lights when the battery is getting low and needs

       Sensitivity - lets you adjust the detection depth.  (See "Adjusting 
                     Sensitivity" below).

            TUNING - Adjusts the balance between the receiver and 
                     transmitter.  (See "Tuning the Detector" below.)


Your RadioShack Metal Detector distinguishes between ferrous and non 
ferrous metals.  Ferrous metals contain iron, while non-ferrous metals 
such as gold, silver, copper, platinum, aluminum, lead, and zinc do not.

When the detector senses a metallic object, the meter reading changes and 
the detector sounds one of three tones.  The tone depends on what metal is 
detected.  The higher the tone's pitch, the stronger the detection.

Preparing The Detector

Turning On the Detector

Hold the detector in a comfortable position, then rotate MODE to the 
desired position.

VLF (Very Low Frequency) - to adjust TUNE and GROUND.  (See "Adjusting 
                           Ground" and "Tuning the Detector" below.)

        TR1 (Transmit 1) - to detect extreme differences in metals, such 
                           as iron and gold.  The difference between iron
                           and gold shows on the meter (iron in the 
                           ferrous section, gold in the non-ferrous 

        TR2 (Transmit 2) - to detect finer distinctions between metals, 
                           such as aluminum and gold (see "Adjusting 
                           Discrimination" below).

Tuning the Detector

Tune fine-tunes the balance between the detector's receiver and 
transmitter circuitry to provide consistent pointer and tone indications. 
Follow these steps to set TUNE. 

1.  Rotate VOLUME to the 10 o'clock position.

2.  Set MODE to VLF.


4.  Hold the search coil at least 1 foot away from the ground and any
    metal object, hold down the red button on the handle and slowly rotate
    TUNE until the analog meter pointer resets at or near 0.

As you search, you can fine-tune the detector using the other controls 
(see "Fine-Tuning the Detector" below).

Note: Press the red button on the handle at any time during operation to
      automatically return the pointer to the center of the analog meter. 

Testing And Using The Detector 

To learn how the detector reacts to different metals, you should test it 
before you use it the first time.  You can test the detector indoors or 

Indoor Testing 

1.  Remove any watches, rings, or other  metal jewelry you are wearing,
    then place the detector on a wooden or plastic table.

2.  Adjust the search coil's angle so the flat part faces the ceiling.

    Note: Never test the detector on a floor inside a building.  Most 
          buildings have metal of some kind in the floor, which might 
          interfere with the objects you are testing or mask the signal

3.  Set MODE to TR1.

4.  Move a sample of the material you want the detector to find (such as a
    gold ring or a coin) about 2 inches above the search coil.

Notes: The search coil will not detect without motion.  You must move the
       object since you are not sweeping with the detector at this time.

       If you are using a coin, the detector detects it more easily if you
       hold it so a flat side (not the edge) is parallel with the flat
       side of the search coil.

If the detector detects the material, the pointer moves to FERROUS or NON
FERROUS while the detector determines the type of metal it is detecting.  
If it detects non-ferrous metal, it also sounds a tone.

If the detector does not detect the material, check the LOW BATT indicator 
and verify that the search coil is properly connected. Also you might need 
to fine-tune the detector. See "Fine-Tuning the Detector" below.

Outdoor Testing and Use

1.  Find an area on the ground outside where there is no metal.

2.  Place a sample of material you want the detector to find (such as a
    gold ring or a coin) on the ground.  (If you are using valuable metal
    such as gold to test the detector, mark the area where you place the
    item, to help you find it later.  Do not place it in tall grass or 

3.  Set MODE to TR1.

4.  While holding the search coil level about 1-2 inches above the ground,
    slowly move the search coil over the area where you placed the sample,
    sweeping the search coil in a side-to side motion.

Search Coil Sweeping Hints:

  Never sweep the search coil as if it were a pendulum. Raising the search
  coil while sweeping or at the end of a sweep causes false readings.

  Sweep slowly; hurrying makes you miss targets.

If the detector detects the item, it sounds a tone and the pointer moves 
to the type of metal it found.  When you detect metal, switch MODE TR1 to 
TR2 to determine the quality of the metal.

If the detector does not detect the material, make sure you are moving the 
search coil correctly.

Notes: The detector responds with a strong signal when it detects most 
       valuable metal objects.  If a signal does not repeat after you 
       sweep the search coil over the target a few times, the target is 
       probably junk metal.

       False signals can be caused by areas containing large amounts of 
       trash, electrical interference, or large irregular pieces of junk 
       metal.  False signals are usually broken or non-repeatable.

5.  Try finding other metal in the area.  When you find a metal item, wait
    a few seconds after the tone stops before continuing to allow the
    detector time to reset (or, press the red button on the handle to
    return the pointer to the center of the analog meter).

Fine-Tuning The Detector

After you become familiar with how your detector works, you can fine-tune 
it to make it less sensitive to interference and more selective in what it 

Adjusting Sensitivity

To adjust the search coil's ability to detect objects at different depths 
in the soil, rotate Sensitivity between MIN and MAX. For maximum detection 
depth, leave SENSITIVITY set as high as possible. If the detector makes a 
"chattering" noise, decrease SENSITIVITY until the chatter stops.

Adjusting Ground 

Setting GROUND takes a little time but is critical for accurate operation.  
GROUND tunes out false signals from mineralized soil.  Follow these steps 
to set GROUND.

1.  Set MODE to VLF and lower the search coil to 1/2 to 2 inches above the

2.  If the pointer swings to the right (Non-ferrous), turn GROUND to
    NORMAL.  If the pointer swings to left (Ferrous), turn GROUND to

3.  Raise the search coil about 1 foot from the ground and press the red
    button on the handle.  The pointer returns to the center.

4.  Repeat Steps 1-3 until the pointer stays close to the center each time
    you lower the search coil to the ground.

After you set GROUND, the detector is set for the soil type at that 
particular site. Do not reset it until you use the detector at a different 

Adjusting Discrimination

Discrimination is the detector's ability to differentiate between types of 
metal.  The detector's DISCRIMINATION setting determines whether the 
detector will distinguish between different types of ferrous and non 
ferrous metals.

If MODE is set to TR2, start with DISCRIMINATION set to mid-range.  While 
you use the detector, adjust DISCRIMINATION to the best position.  As you 
set DISCRIMINATION higher, the detector becomes more sensitive to the 
differences between large aluminum and gold pieces, for example, but some 
small valuable pieces such as coins and small rings, might be overlooked.

As you set DISCRIMINATION to higher levels, the detector first does not 
detect small places of silver paper, then thick foil, and finally metal 
objects like pull tabs from aluminum cans.

Note: Each time you use the detector in a different area you must readjust
      DISCRIMINATION.  Each search location presents new challenges.

False Signals

Because your detector is extremely sensitive, trash-induced signals and 
other sources of interference might cause signals that seem confusing.
The key to handling these types of signals is to dig for only those 
targets that emit a strong, repeatable signal.  As you sweep the search 
coil back and forth over the ground, learn to recognize the difference
between signals that occur at random and signals that are stable and 

To reduce false signals when searching areas containing large amounts of 
trash, scan only a small area at a time using slow, short overlapping 

Detection Hints

No detector is 100 percent accurate.  Various conditions influence metal 
detection.  The detector's reaction depends on a number of factors:

  The angle at which the object rests in the ground.

  The depth of the object.

  The amount of iron in the object.

  The size of the object.

Pinpointing A Target

Accurately pinpointing a target makes digging it up easier.  This takes 
practice, and we suggest you practice finding and digging up small metal 
objects on your own property before you search other locations.

Sometimes, targets are difficult to accurately locate due to the sweep 
direction.  Try changing your sweep direction to pinpoint a target.

1.  When the detector locates a buried target, continue sweeping the
    search coil over the target, in a narrowing side-to-side motion.

2.  Make a visual note of the exact spot on the ground where the detector

3.  Stop the search coil directly over this spot on the ground.  Then move
    the search coil straight away from you and straight back toward you a
    couple of times.

4.  Make a visual note of the exact spot on the ground where the detector

5.  Repeat Steps 1-3 at a right angle to the original search line, making
    an "X" pattern. The target will be directly below the "X" at the point
    of the loudest response.

Notes: If trash in an area is so heavy and you get false signals, slow
       your sweep speed and use shorter sweeps.

       Recently buried coins might not respond the same as coins buried
       for a long period of time because of oxidation.

       Some nails, nuts, bolts, and other iron objects (such as old bottle
       caps) oxidize and create a "halo" effect.  A halo effect is caused
       by a mixture of natural elements in the ground and the oxidation
       created by different metals.  Because of the metal mixtures, target
       signals might not be in a "fixed" position. This effect makes these
       objects very hard to detect accurately. (See "Fine-Tuning the
       Detector" above.)

(BR EB 1/22/1)

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