Operating instructions
the rYete, (and remain) the batteries
need
to
be
renewed.
(If
the
batteries give a
low
reading at the
beginning
of
an
outing,
it
may be
that
during searching,
after
some
use,
the batteries
will
fall
below
the
minimum
level
for
correct
operating.)
A penlight
battery
pack
with
6 HP7
each
with
a nominal voltage
of
1
Y:,v
make up
the
9
volt
pack.
The detector
will
continue
to
function
until
the voltage falls
below
6 volts.
At
this
point
it
will
still
function,
but
the sound
stability
will
deteriorate, and
the
signal over a target
will
latch on
full
reading.
A critical
time
is
when
the
battery
pack
is
about
to
fEll
below
6
volt.
After
use
the voltage
will
fall
below
the necessary level,
but
equally
after
rest the batteries
will
recuperate and gi\'e
sufficient
power
for
normal operation.
The
use
of
headphones
is
strongly recommended
not
only
for
better
performance,
but
because head-
phom
s
do
not
drain
the
batteries
as
quick
Iy
as
the
loudspeaker.
Rechargeable batteries represent a good alternative,
with
the
rising cost
of
standard batteries.
Unlike
standard batteries, rechargeable nicad cells maintain the
same
voltage
throughout
their
storage and
use.
As
they
become discharged
with
use
the
voltage
will
then
drop
completely,
unlike
the gradual decay
of
standard batteries. Whilst a standard
battery
will
last, say,
25
hours
of
use,
a rechargeable cycle
will
be 8 hours,
but
recharging
will
give up
to
500 x 8
hour
cycles
of
use.
If
you
detect
for
four
hour
sessions
the
batteries should
not
be charged after each session
of
use.
It
is
more
efficient
to
go
as
near
as
possible
to
the discharge
point
before recharging. A
full
14 hours should be allowed
for
recharging.
I.
J. &
K.
DETECTOR STEMS
These connect
by
inserting one
within
the other. A metal knurled
nut
containing a plastic olive effects
the tightening.
It
is
recommended
that
the
knurled
nut
is
placed over the
thinner
of
the
stems
of
any
two
being connected together
before
sliding this stem
into
the
thicker
one. The knurled
nut
can then
be offered
up
to
the
thread
on
the
thicker
stem and tightened. This procedure avoids
the
possibility
of
pushing the plastic olive
into
the stem.
If
you
tighten
the
knurled
nut
and the pipes are still
not
secure, the plastic
olive
has
become unseated
from
the
knurled
nut
as
described.
M.
SEARCH
HEAD
The concentric coi I arrangement
of
the search head is designed
to
transmit and receive a magnetic field
and detect the changes
that
occur when metal
is
present. Because the receive
coil
is
in the centre and
the
transmit
coil
around
the
perimeter, the hot-spot
or
pinpointing
area
is
in
the
exact centre
of
the
search head.
.\
C-Scope search heads are
fully
waterproof
and can tht3refore be immersed in
rivers,rockpools,
etc.
up
to
the lowest knurled nut.
After
use,
particularly
in
salt water,
it
is
advisable
to
wash
off
the search
head
and
lower
stem in fresh water.
It
must
be
remembered
that
the search head
is
very sensitive
to
temperature changes.
It
is
therefore
important
to
allow
the
detector
to
reach
the
temperature
of
the
surroundings in which
it
will
be used.
For
example,
if
you
take
the
detector
from
a
hot
car
on
a cold
day,
the
detector
will
drift
until
the head
has
absorbed the temperature chaAge.
OPERATING PROCEDURE
Setting
the
Tuning Level
of
the Detector
The fundamental
principle
of
detector
operation
is
that
the
detector
should
be
tuned
to
the
correct
level. This
is
the
level when the signals are balanced, and
is
indicated
by
the
detector
being
neither
silent
nor
sounding
off.
In
fact,
the correct
tuning
level is
the
threshold setting when
the
sound is
just beginning
to
break
through.
For
best results,
it
is
important
to
set
this
tuning
level accurately and
to
maintain
it
at
all
times
when
searching.
Follow
this
procedure:-
As a starting
point
1. Set
the
detector
to
Function
G
-1
Discriminate Level
o
Sensitivity
o
On/Off
Tune
o
2.
Switch
the
detector
ON.
3.
Hold
ADC
switch
to
the
left,
and at
the
same
time
rotate
the
TUNE
control
clockwise
until
the
sound
just
begins
to
break thrclugh, and
the
meter reads in the central
TUNE
position. Release the
ADC
switch.
The
detector
is
now
correctly
tuned.
The
ADC
switch
has
programmed
the
correct
tuning
level
into
the
detector's
memory,
and there
should
be no
further
requirements
to
operate
the
ON/OFF
TUNE
control.
If
the
tuning
level alters
simply
operate the
ADC
switch
to
recall
the
optimurr
tuning
level.
OPERATING
IN
THE
METER
DISCRIMINATE
MOI)E
Follow
Sections 1-3
"Setting
the
Tuning
Level
of
the
Detector".
To
operate in the reco;nmended
mode
METER
DISCRIMINATE:
4a. Hold
ADC
to
the
left
or
right and switch the
function
control
to
METER
DISC ON
position.
5a.
The Sensitivity
Control
can
be adjusted up
to
+5
as,in the
METER
DISCRIMiNATE
5