8
THE BASICS OF METAL DETECTING
This metal detector is intended for locating buried metal objects. When
searching for metals, underground or on the surface, you have the following
challenges and objectives:
1. Ignoring signals caused by ground minerals.
2. Ignoring signals caused by metal objects that you do not want to find, like
nails.
3. Identifying a buried metal object before you dig it up.
4. Estimating the size and depth of objects, to facilitate digging them up.
5. Eliminating the effects of electromagnetic interference from other
electronic devices.
Your metal detector is designed with these things in mind.
1. Ground Minerals
All soils contain minerals. Signals from ground minerals can interfere with
the signals from metal objects you want to find. All soils differ, and can differ
greatly, in the type and amount of ground minerals present. The Eurotek
®
has a preset ground elimination setting. No user adjustments are required.
2. Trash
If searching for coins, you want to ignore items like aluminum foil and nails.
You can see the Target-ID value of the buried objects, listen to the sounds,
and then decide what you want to dig up. Or you can eliminate unwanted
metals from detection by using the DISCRIMINATION feature.
3. Identifying Buried Objects
Metal objects are identified by a 2-digit number on the display screen. This scale
has 99 points of resolution, and is an indicator of the relative electrical
conductivity of different objects. Higher numbers indicate more conductive
targets. Iron objects, which are usually of lesser value, display lower numbers.
Silver coins, for instance, usually display the highest numbers.
4. Size and Depth of Buried Objects
The 3-digit bar graph indicates the relative depth of a buried metal object. This
bar graph can indicate the relative size of different objects or their distance
from the searchcoil. For a given object, the more distance between it and the
searchcoil, the more bars illuminated.
13
Target Detection
Sweep the detector back-and-forth over the
ground.
Keep the searchcoil parallel to the ground as
you sweep; do not lift the searchcoil at the
ends of your sweeps.
Searchcoil motion is required for target
detection.
Target-ID
When objects are detected, the detector will emit a sound and a 2-digit Target-
ID will appear on the screen. Possible Target-IDs range from 1 to 99. This
number represents the electrical conductivity of the target detected; higher
numbers indicate more highly conductive targets.
The 2-digit number indicates the Target-ID of the last object detected. The
Eurotek
®
has a very fast target response and is able to detect different objects
in very close proximity. Therefore, the Target-ID displayed may change rapidly
as you sweep the searchcoil.
Three seconds after the last Target-ID is displayed, the Target-ID will time-out
and the number will disappear.
CORRECT
WRONG
DISCRIMINATION SYSTEM
As a general reference, targets fall into the following ranges:
1 - 39 : iron
42 - 48 : foil and small gold nuggets
54 - 57 : gold nuggets, gold rings or targets containing mostly gold
87 - 89 : clad coins or coins of recent vintage
82 - 83 : copper coins
93 - 99 : larger silver coins
Note: There are a wide variety of metals and no target can be identified
for certain until unearthed. This table is for general reference only.
See the table on P. 15 for a more complete listing of Target-ID values for
common metal items.
The Target-ID system and the Audio-ID systems on the Eurotek operate
independently. Therefore, there may be times when the tones and IDs seem
inconsistent. For example, a very deeply buried target may induce a low tone,
but the signal may be too weak for the visual ID system to determine, with
confidence, a reliable Target-ID number. In this case, the detector may not
register a visual Target-ID, even after the detector has emitted a tone.
2-Tone System
Depending on the type of metal detected, and the DISC setting of the detector,
a buried metal object will induce one of the following audio responses:
No sound: metals eliminated from detection (or discriminated-out), with
the DISC function.
V.C.O. (variable pitch and volume): targets with an ID less than 80.
High Tone: all targets with an ID of 80 or greater.
