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TURN
the detector
on.
TUNE
for
Threshold
by
holding
in
on
the Push-Button while turning the Tuner Control
until
an
audible
tone is barely
heard.
t-
ween-O-E9.
Release
the Push-Button.
The
detector
is
now
"Tuned".
This Threshold
'
adjustment
is very
important because it sets the detector for its maximum sensitivi-
ty.
T
A
-
.«
SET
the Discriminate Control to\the "ground reject"
area,
which allows all metals to
be
detected.
Push and Release
the push-button to retune.
'
MOVE
a
coin back and forth
in
front of
the loop,
(do
not get closer than
one
inch
to
the loop). Notice how the tone changes to indicate the presence of
a
"target".
THE TONE
will always
Increase when
a
target is detected with the Discrimination
Control
in
the Ground Reject
area.
NEXT, MOVE
a
nail
in
front of the
loop and notice the increase
in
tone.
CONTINUE
this
process, using
a
variety of both valuable
and
junk items, to
familiarize yourself with the somewhat different tone changes for
each item.
With
practice, you will
be
able to
distinguish
between
targets according to their particular
tone sounds.
NOTICE
also the distance away from the loop at which the objects
can
still
be
detected.
Using
the test set-up
just outlined,
it is
now a
good idea to
familiarize yourself with
Discrimination capabilities of
both the
1/DB0!-rd-BIDS-SERIES
2
metal detectors. The
Discriminator either accepts
or
rejects certain metal objects depending
on
the
amount of discrimination
used. IMPORTANT: Some
depth loss will result
at very
high
discrimination settings.
However,
variable discrimination controls allow
precise
level
settings
and
thus
have
an
advantage
over
factory
preset levels. You
should, therefore, make careful notes
as
to where various items
are
rejected
on
your
detector's Discrimination setting.
Refer back to
Illustration
K
and the
introduction
on Pg. 12.
TURN
your detector
on.
Tumor TUNE it
for threshold.
'Mac.
SET
the Discrimination Control to the minimum
level in
the
discrimination
(Approx-
imately
4) area.
Push and release
the button to retune.
PASS
each of your
test items
in
front of the
loop, do not
come
closer than
one
inch
to
the loop.
NOTICE
the detector's response to
each item.
335%
INCREASE
the
discriminate
level
slightly,
(push and release
button to
retune) and
repeat the test of each item, noting the difference
In
tone changes.
A NEGATIVE
response will
occur
as
the Discriminator rejects the
Item.
A
negative
response
means
the tone
goes quiet
as
the object
nears
the loop.
'
CONTINUE
this
process, noting at which
level
of discrimination
each item is
re-
jected. Also,
make
speclal note of which
"good"
Items
are
rejected along with
"junk"
items at the increased settings.
NOTICE
that
when the level is high enough to reject pull tabs, then nickels,
some
gold rings,
and
some
small gold items
will also
be
rejected. But the detector will
still
respond
"good"
to copper and silver.
REMEMBER,
the tone will increase
in
response to good targets and will go quiet
in
response to junk.
I3
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