Recovery Tools; False Signals - Fisher M-Scope CZ-5 Quicksilver Operating Manual

RECOVERY TOOLS

FALSE SIGNALS

A "false signal" occurs when a target is incorrectly identified.
For example, a small broken-off piece of pull-tab may be
identified as a nickel. Or a small deep coin, especially in
mineralized soil, may read "IRON". The more sensitive the metal
detector, the harder it is not to have false signals. Your CZ-5 is an
extremely sensitive machine so you're bound to encounter them.
Here are some of the most frequent sources of false signals and
what to do about them:
1. A heavy duty, blunt screwdriver is commonly
used by expert Treasure Hunters and is the tool of
choice for cut lawns.
2. A sturdy hunting knife with a five inch blade will
do the job on most other soils. A high quality double
edge "survival" knife is an even better (and more
expensive) choice since it will be almost impossible
to bend or break.
CAUTION: Using a jack knife without a locking
blade is a good way to lose a finger!
3. A narrow garden trowel will work in loose or wet soil.
4. Several excellent digging tools are made just for
the Treasure Hunter and especially designed sand
scoops are available for beachcombing.
5. A thin, dull probe is the preferred tool for precise
target location.
1. TRASH: The most common source of false signals.
Large or irregular pieces of trash may give positive,
lock-on false signals. In this case you'll usually have
to dig the target but with experience you'll be able
to eliminate many of the large targets whose size
will be obvious when you go into the pinpoint
mode.
Another false signal response may be a "one-
way" or disappearing signal. You'll sweep over the
target and get a good signal but nothing on the
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