Fisher CZ-20 Quicksilver Operating Manual page 33

OPERATING TIPS
3. Recheck your ground balance occasionally.
4. 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.
5. 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
much you might find in an area that would
otherwise be unsearchable at high sensitivity levels.
6. Set your discrimination at an appropriate level.
If there's very little trash in the area, set it low, say
at iron discrimination, and dig every good signal. If
there is a lot of trash present and you're mainly
interested in coins, set the discrimination level high
you may even want to sacrifice nickels and zinc
pennies in extremely trashy areas. If you're looking
for gold rings, relics, artifacts, or small ancient coins,
you'll have to set your discrimination level low. The
best way to find out how low is to bury some sample
targets or just dig everything for awhile until you
get a feel for which target classifications will be
the most productive.
7. Look for repeatable signals and don't waste time
on disappearing or one-way signals. If you hear a
good beep but can't repeat it when you go back
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