16
TARGET I.D.
When the DISC control is set in the 0-6 positions, the CZ-20 has
the ability to identify many types of small targets and, depending
on the discrimination level, reject or ignore most of them. To better
understand just how your CZ-20 responds to different targets, try
the following:
1. Scatter some sample targets such as coins, rings, pull
tabs, nails and foil on the ground at least 18 inches
apart. Include some large targets as well: jar lids,
soda cans, etc.
2. Set the DISC control at “0,” SENS at “5.” Adjust the
VOLUME control for a comfortable level when you
are over a large target.
3. Ground balance the CZ-20 as in the “Ground
Balance” procedure.
4. Hold the search coil about 2 inches above and
parallel to the ground and move it slowly back and
forth across each sample. Remember, the coil must
be in motion to get a response. Keep in mind that
for accurate target I.D., the coil center must pass
directly over the target.
5. Note the different audio responses over the various
targets. Your CZ-20 will respond with a low tone over
most iron or steel targets. Pull tabs and foil will give
a medium-tone response and U.S. coins will give a
high-tone response.
6. Note that an elongated ferrous object such as a
nail will give you a double “beep” as you cross it
from end to end or a single “beep,” if you cross its
center.
7. When you go over a large, shallow target the CZ-
20 will respond with a distinctive bell tone. This is
due to the fact that metal detectors can only
identify small targets. Indicating that the detector
circuits are overloaded and possibly a target is
“good” (silver, coins, etc.), but cannot be
accurately identified. Big deep targets, are also
classified as a coin. Be aware that coins on the
surface may set off the bell tone if you get too close.
SEARCH MODES
25
fooled. Large targets, uneven ground
mineralization, good targets lying next to bad
targets, deep targets, all of these and more are
sources of error. Remember, the CZ-20 is designed
to I.D. small, coin-sized targets only, and even some
of these may be deep enough, bent, damaged,
or corroded enough to give a false signal.
9. You should also realize that there are many good
targets which are not classified by the CZ-20, as
mentioned earlier. Gold rings, for example, may fall
into any category except iron. Many foreign coins,
especially the new ones, may I.D. as foil or pull tab.
Gold nuggets, depending on their size and shape,
may fall into just about any category, the smaller
nuggets falling on the lower half of the scale. So if
you’re not just looking for U.S. coins, you should test
some sample targets to determine what level of
discrimination you want to work at and what targets
you want to dig.
10. Here’s a quick and easy way to tell the difference
between a small, shallow piece of foil and a gold
ring (or other possibly good target) without digging:
If you get a good solid “FOIL” I.D., set the search
coil down close to the target and then whip it
rapidly across the target just once with what can
best be described as a flick of the wrist. lf the target
disappears, it’s probably a small, shallow piece of
foil. If not dig it up it could be that gold ring you’re
looking for. Practice this over some foil until you
get the hang of it.
11. Don’t be afraid to turn your sensitivity down. True,
the higher the sensitivity, the deeper your CZ-20 will
go, and the more you’ll find. But that’s only under
optimum conditions. If you’re getting a lot of false
signals caused by electrical interference, ground
mineralization or dense trash, lower your sensitivity.
If you have to back it down to “4,” “3” or even “2”
to eliminate the falsing, do it. That’s what your
SENSITIVITY control is for. You’ll be surprised at how
TARGET IDENTIFICATION
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