Fisher Labs CZ-21 QuickSilver Operating Manual page 32

FALSE SIGNALS
2. Deep Targets: Deep targets, just barely within
3. Electrical Interference: Constant chatter caused by
4. Highly Mineralized Soil: May cause a bell tone
5. Black Sand: Same as Highly Mineralized Soil
30
I.D. location, your target is probably a piece of iron.
Reducing your sensitivity level, taking shorter, slower
sweeps, or increasing the discrimination level may
reduce the number of false signals caused by trash.
the range of the CZ-21, may be misidentified. For
example, a deep coin may I.D. as iron, or a deep
piece of iron may I.D. as a coin. There's not much you
can do to avoid this other than to use your pinpoint
mode to ensure that you are exactly centered over
the target. Or you may reduce your sensitivity level
so you just ignore the very deepest targets.
radio/TV stations, power lines or nearby detectors
operating at one of the CZ-21 search frequencies.
The best solution is to move away from the source
of the interference. You may also try one of the
following:
a) switch to the Autotune mode.
b) reduce your sensitivity level.
c) slow down your sweep speed.
If the interference is only minimal and you wish to
continue searching anyway, test your CZ-21 over a
known target to make sure it's operating properly.
Inside some buildings, electrical interference may be
so bad that you'll have to go outside just to bench
test your CZ-21.
response or constant false signals. Check your
ground balance (See page 11). Try lowering the
sensitivity and/or increasing the discrimination level.
Search in the AUTOTUNE mode. Re-ground balance
using the "bobbing" method (See page 13). If all
else fails, raise the search coil just high enough for
the false signals to disappear and then sweep at
that constant height.
above.