MD 5008 User manual

MAIN TECH PARAMETER CARE AND MAINTENANCE
MAIN TECH PARAMETER
zEmitting Frequency
6.99KHz
zSignal Frequency
437KHz
zWeight
2.875KG
zPower Supply
8pcs1.5VBatteries
Attach external
battery box and bag.
zMax Detection
Small coil: 1.5meters
Big coil: 3.0-3.5meters
This conclusioin is elicited by
testing an aluminum sheet
(60cm*60cm*1cm) buried in
dry soil
zSensitivity
Small coil: 25-30cm (test 25 US
cent)
Big coil: 35-40cm (test 25 US
cent)
zIf the detector doesn’t work
properly, it is possible that the
batteries haven’t enough power,
replace batteries to try ;
zPlace batteries matching the
polarity symbols (+ and －) If
you won’t use it for a long time,
take out the batteries to avoid
putridness;
zThe search coil’s plug should be
not affected with damp, or the
detector will loss detection
ability; the plug can be used
only after drying in such
condition;
zThe detector is prohibited to
work in rainy day and in
burning sun;
zThe search coil should be far
away from furnace and other
high temperature circumstance;
zEach detector is attached a
piece of guarantee and it is free
to be repaired during the length
of warrantee unless he circuit is
changed by user himself.
OWENER’S MANUAL MD-5008
Please read before using this equipment
Metal Detector
5008
15

FEATURES
With your MD-5008 Metal
Detector, you can hunt for coins,
relics, jewelry, gold, and silver, etc,
just about anywhere. The metal
detector is versatile and easy to use.
The detector’s features include:
Headphone Jack – lets you
connect headphone (not supplied)
to the detector.
Viewmeter and Pointer – shows
the probable type of metal being
detected.
Volume Indicating – gives off
tune of fixed frequency while
finding metal.
Waterproof Search Coil – lets
you use the detector’s length for
comfortable use.
Note: The search coil is
waterproof, but the control housing
is not waterproof..
Adjustable Stem –lets you adjust
the detector’s length for
comfortable use.
Note: your metal detector requires
8 pieces of 1.5 V batteries.
TREASURE HUNTER’S CODE OF
ETHICS
All treasure hunters might be judged
by the example you set. Here are a few
basic rules you should follow while
using your detector.
zAlways get permission before
searching any site.
zRespect the rights and property of
others.
zObserve all national, state, and
local laws while treasure hunting.
zNever destroy historical or
archaeological treasures. If you
are not sure about an object you
have found, contact a museum or
historical society in your area.
zLeave the land and vegetation as it
was. Fill in any hole you dig.
zUse your detector only in safe
areas.
zDispose of any junk you find, only
in approved areas. Do not leave it
for the next treasure hunter to
find.
Notes:
zThe search coil will not
detect without motion. You
must move the object since
you are not sweeping with
the detector at this time.
zIf you are using a coin, the
detector detects it more
easily if you hold it so a flat
side (not the edge ) is
parallel with the flat side of
the search coil.
OUTDOOR TESTING AND
USE
1. Find an area on the ground
outside where there is no
metal.
2. Place a sample of the material
you want the detector to find
(such as a gold ring or a coin )
on the ground. (If you are
using valuable metal such as
gold to test the detector, mark
the area where you placed the
item, to help you find it later.
Do not place it in tall grass or
weeds.)
3. While holding the search
coil level and about 8 inches
above the ground, slowly
move the search coil over the
area where you placed the
sample, sweeping the search
coil in a side to side motion.
4. Try finding other metal in
the area. When you find a
metal item, wait a few
seconds after the tone stops
before continuing, to allow
the detector time to reset (or,
press the Zeroing Button to
return the pointer to “0”
position).
1 14

DETECTION NOTES CONTENTS
6) Eliminate unneeded target:
If detect indoor or search very
trashy ground, there are a lot of
metal trash, they are usual no use
and can be eliminated during the
detection.
For example, in an area full of iron
nails, the iron nail’s signals can
interfere the detection, to solve
such problem, you can firstly put a
iron nail on the ground and let the
search coil sweep over it, if the
sound increase, press the button and
rotate the “DISCRIMINATION”
clock-wise a little, relieve the
button and try again; adjust
repeatedly until the sound doesn’t
change when the detector sweeps
over the iron nail.
After adjusting, the detector doesn’t
respond to iron nails and ferrous
metals whose size are smaller than
iron nail buried in the ground, but it
can respond to all non-ferrous
metals and ferrous metals whose
size are bigger than iron nail.
13
INDOOR TESTING AND
USE
1. Remove any watches, ring, or
other metal jewelry you are
wearing, then place the
detector on a wooden or
plastic table.
2. Adjust the search coil’s angle
so the flat part faces the
ceiling.
Note:
Never test the detector on a floor
inside building.
Most buildings have metal of
some kind in the floor, which
might interfere with the objects
you are testing or mask the signal
completely.
Move a sample of the material
you want the detector to find
(such as a gold ring or a coin )
about 2cm above the searchcoil.
Preparation...............................................................................................3
Assembling the Detector…………………………………………………3
Installing Batteries……………………………………………………….4
Testing the Batteries………………………………………….......5
Adjusting the Meter………………………………………………5
Using Headphones………………………………………………………..5
Listening Safely…………………………………………………..6
Traffic Safety……………………………………………………..6
External Power Jack……………………………………………………6
Introduction of Operating Buttons............................................7
Zeroing Button.........................................................................................7
Tune Turn Button.......................................................................................7
Sensitivity Turn Button..............................................................................8
Ground Balance Turn Button....................................................................8
Discrimination Turn Button......................................................10
Operation Mode Switch ...........................................................................11
Actual Detection Operation..........................................................11
Preparation ..............................................................................................11
Ground Balance Mode ............................................................................12
Discrimination Mode ...............................................................................12
Detection Notes.....................................................................................13
Indoor Testing and Use............................................................................13
Outdoor Testing and Use ........................................................................14
Main Tech Parameter ......................................................................15
Care and Maintenance.....................................................................15
2

PREPARATION
ASSEMBLING THE DETECTOR
Assembling your detector is easy
and requires no special tools. Just
follow these steps.
1.Turn the stem’s lock nut
clockwise until it loosens.
2.Lengthen or shorten the stem so
when you stand upright with the
detector in your hand, the search
coil is level with and about 8
inches above the ground with your
arm relaxed at your side.
3.Turn the stem’s lock nut
counterclockwise to lock it in
place.
4.Unscrew the knob on the search
coil and remove the knobs and
connector. Insert the stem and
align the holes on the search coil
3
bracket and the stem. Push the
connector through the holes and
tighten the knob
5.Wind the search coil cable
around the stem. Leave enough
slack in the cable to let you
adjust the search coil when you
are hunting on uneven ground.
6.Insert the search coil’s plug into
the search coil jack on the
detector’s control housing. Be
sure the pins on the plug align
with the holes in the jack.
Cautions:
zThe search coil’s plug fits
into the connector only one
way. Do not force the plug or
you could damage it.
Remove any watch, ring, metal
button, cigarette box, etc you are
wearing, and wear shoes without
iron nail.
GROUND BALANCE MODE
This mode can eliminate the
“minerlization reaction” and has
better penetrability, so this mode
is preferentially selected
wherever indoor or outdoor
search. In this mode, as long as
the search coil is moved right
over the target, the detector
sounds and the viewmeter
indicates the change, any type of
metal raises the volume.
Follow these steps to set it
1) Turn on the switch;
2) Set the MODE to “GROUND
BALANCE”;
3) Stop the search coil 24inch
above the ground, press and
relieve the “Zeroing Button”
for several times to preheat
the detector until the pointer
returns to the “0”;
Set the “critical sound”;
4) Set “GROUND BALANCE” as
mentioned above;
5) Sweep the search slowly along
the ground and keep 8inch
above the ground.
DISCRIMINATION MODE
This mode is used to distinguish
ferrous metal and non-ferrous metal,
to select bigger metal and to
eliminate smaller ones between
the same type of metals. This mode
hasn’t “GROUND BALANCE”
function, so the “minerlization
reaction” is heavy, the operator
should use it carefully.
Follow these steps to set it:
1) Turn on the switch;
2) Set “MODE” to
“DISCR-IMINATION”;
3) Preheat;
4) Set the “critical sound”;
5) Distinguish the ferrous and
non-ferrous metal:
Use the discrimination turn
button turn to MIN position. The
pointer will rotate to right when you
detect the ferrous metal,
simultaneously, the detector sound
will raise.
If you turn the discrimination turn
button to MAX position, the pointer
will rotate to right when you detect
the non-ferrous metal,
simultaneously, the detector sound
will raise. 12

ACTUAL OPERATION
OPERATION MODE SWITCH
(MODE)
There are two sections in operation
mode switch, one is GROUND
BALANCE, and the other is
“DISCRIMINATION”.
Set MODE to “GROUND
BALANCE”, the detector responds
to all metals, has no discrimination
function, but can eliminate the
effect of “minerlization reaction”,
has enough penetrability, works
steadily, and indicates properly, so,
this mode is usually selected at the
beginning of detecting some area.
Set MODE to
“DISCRIMINATION” the detector
can distinguish the type of the metal
and select the bigger and valuable
metal.
11
PREPARATION:
Place batteries into the battery
compartment, turn on the power
supply switch, the detector is
electrified to work. The pointer is
usual not at the center of the
viewmeter when detector is just
on, but swings to one side. This
expresses that the detector is not
in a steady mode, you need to
press and relieve the “Zeroing
Button” a few times until the
pointer doesn’t drift any longer.
All of these are normal
phenomena. The detector needs a
short time to preheat, during this
period, the search coil should rest
over the ground and begin to
work only after the pointer return
to “0” position. Watch the
indictor light when you press the
button, if the light is dim or dark,
replace the batteries.
In detection, the operator holds
the handle and sweeps slowly the
search coil above the ground,
keeps the search coil 8inch above
the ground. When finding metals,
the detector responds and the
viewmeter indicates change.
zTo disconnect the search
coil’s cable from the
detector, grasp the plug and
pull it out of the connector.
Never pull on the cable.
7.Loosen the knob at the search
coil’s end, then adjust the
search coil to the desired angle.
(The search coil should be
parallel with the ground.)
Tighten the knob just enough
to keep the search coil from
rotating or wobbling.
Caution: Do not overtighten
the search coil or use tools
such as pliers to tighten it.
INSTALLING BATTERIES
You need 8 pieces of 1.5V
batteries to power your detector.
Cautions:
zUse only fresh batteries of
the required size and
recommended type.
zDo not mix old and new
batteries, different types of
batteries (standard, alkaline,
of rechargeable), or
rechargeable batteries of
different capacities
1. If the detector is ON, turn it to
OFF.
2. Press the right battery
compartment cover’s tab and
slide the cover off in the
direction of the arrow.
3. Place 4 pieces of 1.5V battery
into the battery compartment on
top of the ribbon, matching the
polarity symbols (+and -).
4. Replace the right battery
compartment cover.
4

5. Press the left battery
compartment cover’s tab and
slide the cover off in the
direction of the arrow.
6. Place 4 pieces of 1.5V batteries
into the battery compartment on
top of the ribbons, matching the
polarity symbols (+ and - )
marked.
7. Replace the left battery
compartment cover.
Cautions:
zAlways remove old or weak
batteries; batteries can leak
chemicals that can destroy
electronic parts.
zIf you do not plan to use the
detector for a week or more,
remove the batteries.
zDispose of old batteries
promptly and properly.
You can extend battery lift by using
headphones, which require less
power than the built-in speakers.
TESTING THE BATTERIS
If the indicator light is dim or
dark, so the detector does not turn
on, has weak volume, will not
tune properly, has erratic
operation, or drifts. Replace the
batteries.
ADJUSTING THE METER
With MODE set to OFF, use a
screwdriver to adjust the
alignment control until the pointer
lines up with 0 on the scale.
USING HEADPHONES
You can connect a pair of stereo
headphones (not supplied) to the
detector so you can listen to it
privately. Using headphones also
save battery power and makes it
easier to identify subtle in the
sounds you hear, for better
detection results.
The detector eliminates the
“mineralization reaction” signal
after setting “Ground Balance”
as above, the searching coil can
sweep the ground freely and only
sounds while finding metal.
DISCRIMINATION TURN
BUTTON
The discrimination Turn button
is used when MODE is set
to “DISCRIMINATION”.
When we rotate the
“DISCRIMINATION” to different
position, we can distinguish
between ferrous metal and
non-ferrous metal by directioni to
which meter pointer swings.
NOTE: Press “Zeroing
Button” before adjusting
“DISCRIMINATION” and relieve it
after adjusting.
5 10

Set MODE to GROUND
BALANCE, then tune the ground
balance turn button.
Rotate the ground balance turn
button to MAX, raise the search
coil, then lower it after setting the
“critical sound”, the volume rises;
Rotate the turn button to MIN, then
do as above, the sound falls. This
experiment confines that the volume
changes while rotating GROUND
between two sides of the scale, so
there must be a point at which the
sound keeps steady, this point is the
“ground balance point” we set.
Follow these steps to set “Ground
Balance Point”:
1) Set MODE to “GROUND
BALANCE”;
2) Stop the search coil about
24inch above the ground, set
the “critical sound”;
3) Lower the search coil about
8inch above the ground; if
the volume rises, raise the
search coil (about 24inch)
and rotate the turn button
counter clockwise to try, if
the volume falls, rotate it
counter-clockwise a little till
the sound gets steady. If the
volume falls when we do as
above, rotate it clockwise till
the sound gets steady.
4) No matter you tune the
volume, it still rises, witch
expresses there are metals in
this area, try another area to
adjust.
5) Press the “Zeroing Button”
firstly before raising the
search coil to set the
“Ground Balance”, lower the
search coil after tuning the
“Ground Balance” and
relieving the “Zeroing
Button”.
To connect headphones to the
detector, insert the headphones’
1/8 inch plug into the headphone
jack on the side of the control
housing.
The detector’s internal speaker
disconnects when you connect
headphones.
Listening Safely
To protect your hearing, follow
these guidelines when you use
headphones.
zSet the volume to the lowest
setting before you begin
listening. After you begin
listening, adjust the volume
to a comfortable level.
zDo not listen at extremely
high volume levels.
Extended high volume
listening can lead to
permanent hearing loss.
zOnce you set the volume, do
not increase it. Over time, your
ears adapt to the volume level,
so a volume level that doesn’t
cause discomfort might still
damage your hearing.
Traffic Safety
Do not wear headphones while
operating your detector near
high-traffic areas.
Even though some headphones are
designed to let you hear some
outside sounds when listening at
normal volume levels, they still can
present a traffic hazard.
9 6

7 8
INTRODUCTION OF OPERATION BUTTON
ZEROING BUTTON
Zeroing Button is at the forefinger’s
position when holding the detector.
Press it, the pointer of the
viewmeter returns to “0” position.
Zeroing Button has memory
function, so it can memorize the
working circumstance at working
time. For example, while holding
the search coil over the ground, the
ground emits signal to make the
pointer leave “ 0”position, you can
return it to “0” by pressing the
Button again. Then you can begin
detecting.
Don’t press the Zeroing Button
near metal, or the detector can not
detect metal any longer.
What must be pointed out is that
you must press the Zeroing Button
before adjusting any other turn
button, then relieve it after finishing
adjusting.
During detection , with the
changes of environment, the
pointer often leaves “0”
position. Pressing Zeroing Button
to return the pointer to “0”, so you
must often press it during the
detection process.
The detector need about one
minute to preheat after turning on
the detector, or the pointer will
leave “0” after pressing the
Zeroing Button. All will be
normal after preheating.
TUNE TURN BUTTON
Adjust the TUNE, the sound rises
slowly, the sound which just can
be heard is called “critical sound”.
The detector has the highest
sensitivity when it is at “critical
sound”.
Note:
Press the Zeroing Button
before adjusting the “critical
sound” and set free it after
adjusting.
If the “critical sound” rises,
falls, or disappears, set it by
pressing the Zeroing Button.
SENSITIVITY TURN
BUTTON
Sensitivity Turn Button controls
the sensitivity of the detector.
Rotate it counter-clockwise to
the end point, the sensitivity is
MIN and the detection depth is
MIN; rotate it clockwise to the
end point, the sensitivity is MAX
and the detection depth is MAX.
To set sensitivity depends on the
testing circumstance, but not
the higher, the better.
For example, in those heavy
mineralization area, high sensitivity
causes false signal, the detector
sounds everywhere so that the
detector can’t find target correctly.
In such condition, lower the
sensitivity to reduce the effect
caused by complex soil; in those
pure area, the higher the sensitivity,
the stronger the detection.
Note: Press the Zeroing Button
before adjusting the sensitivity and
set free it after adjusting.
GROUND BALANCE TURN
BUTTON
Owing to The “mineralization
reaction”, the search coil of
old-style metal detector emits false
signal, and the “critical sound” is
affected by the change of the
distance between the search coil and
the ground, so you can’t distinguish
the type of the signal (minerlization
signal or metal signal). To solve
such problem, Ground Balance
Circuit is designed to decrease the
“mineralization reaction” to the
lowest.