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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. What usually happens is that
the detector circuits will overload and identify a
target as “good” (silver, coins, etc.). Your CZ-20,
however, will alert you to the fact that the target
is big and shallow, and cannot be accurately
identified. (Big deep targets, however, will usually
be classified as a coin. Also be aware that coins
on the surface may set off the bell tone if you get
too close. And the smaller 5-inch coil is more likely
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