Operating instructions
INSTRUCTIONS
VLF.TR
1200-8
INTRODUCTION
IMPORTANT
To
protect
your
investment complete
both
sections
of
the guarantee at the back
of
this
instruction
manual and return the reply-paid
portion
to
C-Scope.
This
is
particularly
important
in order
to
obtain
the free second year parts guarantee.
Please
retain the packing
box.
In
the
event
your
detector
should ever require service this package
will
be most suitable
for
postal
protection.
C-Scope detectors are recognised
as
the
finest metal detectors available.
They
are designed
with
lasting
quality
in
mind,
high
technology
input,
and above all, value. '
The
only
way
to
realise
this
value and
quality
is
to
carefully
study
and understand
this
instructi0'1
booklet.
You
will
then
be able
to
obtain
all
of
the
advantages designed
into.your
detector.
It
is also
strongly recommended
that
you
experiment
with
the
detector
operation indoors
in
air
with
test samples,
in order
to
learn
to
identify
and understand
the
detector's
capabilities and responses.
It
is
best
to
lay
the
detector
on
a table
with
the
head
off
the end and
pass
the test objects across
the
search head
to
best stimulate actual responses.
FEATURES
Before progressing
to
the
controls
and
the
operating procedure
it
is
important
to
understand the
principles
of
operation
of
the
1200-8.
The
1200-8
principle
features:-
Ground
Effect
Elimination
-
Ground
Exclusion.
Rejection
of
selected items -
Discrimination.
GROUND
EXCLUSION
What
is
Ground
Exclusion?
On some sites mineralisation caused
by
iron deposits
or
iron oxides
or
wet
salt sand makes
it
difficult
to
operate a
detector
successfully. The effects
of
these minerals
is
termed 'ground
effect'.
In practice
the signal
of
the
detector
alters
if
the
search head
is
not
kept
exactly
steady
during
sweeping and
the'
gap between
the
search head and ground varies
the
correct
tuning
level cannot be maintained and
therefore
depth
penetration
is
reduced.
If
the
tuning
level varies upwards,
as
on inland sites when
the
detector
head
is
inadvertently
raised,
the
signal may also be confused
with
a target signal.
The 1200-B
is
programmed
to
eliminate
ground
effect
i.e. ground exclude.
Inland Sites
The G-mode
is
the mode in
which
'ground exclusion'
is
achieved.
The
programmed level
of
grourjd
exclude
of
the 12oo-B
in
the G-mode
will
overcome most ground
effect,
even severe mineralisation
o"n
inland sites. When operated in
the
Meter Discriminate mode
the
12oo-B will. give ground exclusion
in
the audio channel and
discrimination
in
the
meter channel
both
at
the
same
time.
Beaches
On wet salt
sand
the
1200-8
will
eliminate ground
effect
b',' operating
in
the
D1
or
D2
mode, and
varying the discriminate level
to
suit.
DISCRIMINATION
What
is
Discrimination?
It
is
an
obvious advantage when metal detecting
to
get
different
signals
for
worthwhile
as
opposed
to
worthless objects
anc!
therefore
be able
to
discriminate
or
differentiate
between
them,
and
hopefullv
reject the signals given
by
worthless objects. The 1200-B gives this
information
in various ways. Basica:IY
a rejected
item
will
cause
the
signal
to
fall. The meter needle
will
drop
to
the
left,
and the
sound
level
will
die away. On
the
other
hand, a good target object
will
cause
the
signal
to
rise. The meter needle
will
move
from
the central
tuning
position
to
the
right,
and
the
sound level
will
increase in loudness.
When operated in
the
Meter Discriminate mode the 1200-B's
discrimination
is
restric.
.:d
to
the
meter
channel. A rejected
item
will
therefore cause
the
meter needle
to
drop
to
the
left.
The
audio
signal in
this mode
will
be
an
increase in sound loudness
for
all targets.
If
an
object
is
very close
to
the
search head.
conflicting
signals
will
occur. These signals are characterised
by
hard swings
of
the meter
from
left
to
right.
If
you
encounter such problems
you
should raise the
search head a
few
inches, retune and rescan.
You
should
now
receive a clear signal.
These anomaly signals are caused
by
the
object
overloading the signal.
Normally
iron
fragments
or
wire on
the
surface cause
this
phenomenon.
2