9
Chapter 3 DFX
™
Quick Start
Search Fundamentals
The loop/search coil must be in motion (sweep-
ing from side-to-side) for this instrument to
respond to metal.
Practice a smooth sweep of
the loop from side-to-side keeping the loop close
to the ground throughout the swing.
Each pass of
the loop should take approximately two seconds
from right to left, two seconds to return from left
to right.
Walk forward slowly. Take small steps no greater
than half normal strides. Make sure each pass of
the loop overlaps the last by at least half the length
of the loop. Do not lift the loop at the end of each
swing. Keep it close to the ground at all times.
To become comfortable with sweeping the loop
takes some practice. Try to loosen up and fi nd a
comfortable grip on the handle. Premature fatigue
may result from gripping the handle too tightly, im-
properly adjusted rod or elbow support, and limited
body movement. Hold the handle loosely. Adjust
the rod and elbow support for comfort and keep the
elbow strap loose. Use your arm, shoulder and even
your back a little to allow a smooth even sweep of
the loop.
Now that you're sweeping the loop smoothly over
the ground, you will notice that the detector starts
making sounds
(beeps)
.
Not all sounds are good
targets; some trash targets also make the detec-
tor
beep.
As the loop is swept over the ground, ignore the
display and concentrate on the sounds the detector
makes.
As the loop is passed over metal that is likely trash,
the sound will be inconsistent. Trash targets typi-
cally produce a shorter, sputter-type sound, that
is often broken or double in nature. Place a steel-
pop bottlecap on the ground. Pass the loop over it
several times to become familiar with this sound at
different loop sweep speeds. Note that an aluminum
twist-off bottlecap
cannot
be used as it is a different
type of target. Also note that very old rusty bottle
caps may start reading as quarters due to the elimi-
nation of the iron alloy through deterioration. Once
familiar with the sound typical bottle caps produce,
an operator may pass over such targets and continue
searching without consulting the display informa-
tion, saving more time for evaluating possible good
targets.
As the loop passes over metal that is likely a good
target, a more consistent and smooth sound will be
heard. A good target typically produces a longer,
more solid sound. Place a quarter on the ground
and sweep the loop over it several times to become
familiar with the sound of a good target.
Why Air/Ground Balance?
When the display prompts you to AIR BALANCE
by holding the loop at waist level and press EN-
TER. The DFX
™
's circuits are being prepared for
ground balancing by measuring temperature and
other variables that affect electronic circuits. The
DFX
™
"beeps" and you lower the search coil to the
distance above the ground that you will be search-
ing. Press ENTER to have the DFX
™
"cancel/track
out" or GROUND BALANCE the ground miner-
alization. The DFX
™
then automatically "tracks
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