GRIZZLY - TWINS USER’S GUIDE
USER’S GUIDE
GRIZZLY TWINS METAL DETECTOR
DIGITAL PULSE INDUCTION
AND
INDUCTION BALANCE
IN ONE DETECTOR
2009
GRIZZLY METAL DETECTORS
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GRIZZLY - TWINS USER’S GUIDE p. 2
CONTENTS
PREFACE............................................................................................................................................3
І. PACKING..........................................................................................................................................4
1.1 Basic Pack 1..................................................................................................................................4
1.2 Basic Pack 2..................................................................................................................................4
ІІ. PREPARATION FOR USE..............................................................................................................4
2.1. Assembly......................................................................................................................................4
2.2. Battery charging............................................................................................................................5
2.3. Use of headphones.......................................................................................................................5
ІІІ. CONTROL UNIT AND BACK PANEL.............................................................................................6
ІV. HOW TO WORK WITH THE PULSE INDUCTION METAL DETECTOR.......................................7
4.1. Control functions...........................................................................................................................7
4.2. Information on the display.............................................................................................................8
4.3. Menu.............................................................................................................................................8
4.4. Work with PI DIGITAL TWINS......................................................................................................10
V. HOW TO WORK WITH THE IB DETECTOR..................................................................................11
5.1. Control knobs................................................................................................................................11
5.2. Work with the detector in IB mode................................................................................................12
5.3. Test and use of the instrument in the open ..................................................................................12
VІ. CARE AND MAINTENANCE..........................................................................................................13
ETHICAL CODE..................................................................................................................................14
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GRIZZLY - TWINS USER’S GUIDE p. 3
PREFACE
Electronics of metal detectors use different principles, some of them have proved in practice to be more
successful and reliable than others. Unquestionably, the most popular, the most effective and affordable
metal detectors function on the principles of Induction Balance/IB/ and Pulse Induction/PI/. This makes the
problem of ground neutralization crucial. On “heavy” soils and when the induction balance detectors cannot
be used, the pulse induction detectors become preferable. Their very low frequency makes them efficient
even on highly mineralized and salty ground. This explains why almost all well-known manufacturers have
pulse induction models. With this type of detectors, the search coil is not part of the resonance circuit, but a
self-contained generator starts the pulse signal. The parameter to be analyzed is the transition time /the
position of the pulse front/.
Pulse induction detectors are very efficient at profound search as they allow scanning with large square
heads /frames/ of size from 1m x 1m to 2m x 2m and even larger. At the same time, the main disadvantage
of this technology is its low capability to distinguish ferrous from non-ferrous metals. This narrows otherwise
the entire hegemony of pulse induction detectors. The experience with these teaches that they alone are
difficult to use, especially when they are equipped with large loops or frames. Pinpointing of small metal
objects is hard and their identification unreliable. The two technologies advantages and disadvantages
complement one another and they are almost always used together especially when a pulse induction
detector with a large search frame is needed. First you scan with the induction balance detector to eliminate
tiny and near the surface objects and then the pulse induction detector with its deep search frame will
identify bigger objects deeper in the ground. Moreover, very deep small and large metal objects can be
detected with ease. The only thing that has to be done is to switch between the two technologies and
change the search heads in turn.
GRIZZLY TWINS combines the two technologies and provides detection on any soil and up to 3 m in depth.
GRIZZLY TWINS is compact, highly sensitive, stable and easy to use. The detector and its accessories
come in a sturdy and convenient carry bag which makes its use and transportation simple and handy.
The induction balance detector has its control knobs and switches positioned in the left on the control panel,
the right portion of which is for the pulse induction detector digital display and its control buttons.
The selection of the mode is done with a button in the middle of the panel. It is this button that provides you
to use only the advantages of these metal detection technologies.
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GRIZZLY - TWINS USER’S GUIDE p. 4
I PACKING
Basic Pack 1
l Search head for PI 38 cm;
l Search head for IB ellipse DD22x32 cm;
l Camouflage rucksack;
l Telescopic handle with a carbon bar;
l Control unit;
l Stereo headphones with adapter and
independent left and right active volume control;
l Charging unit: 220 and 12V for a car lighter;
l Control unit case – made of high-quality
waterproof and heat-resistant isolation material;
Optional: Search frame 1m x 1m. It can be
ordered in addition to the basic pack or as a
replace of the search head for PI 38 cm – this
pack is called:
Basic Pack 2
l Search head for PI 1m x 1m;
l Search head for IB ellipse DD22x32 cm;
l Camouflage rucksack;
l Telescopic handle with a carbon bar;
l Control unit;
l Stereo headphones with adapter and
independent left and right active volume control;
l Charging unit: 220 and 12V for a car lighter;
l Control unit case – made of high-quality
waterproof and heat-resistant isolation material;
II PREPARATION FOR USE
2.1. Assembly
You do not need to have special skills to
assemble the tool – it is easy to do. You only
need to follow these steps:
-Placement of search head:
Remove the nut and then tighten the search
head, fix the detector rod into the search head
clamp, insert the screw back into its hole and
secure with the nut. Now you have assembled
the head with rod.
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GRIZZLY - TWINS USER’S GUIDE p. 5
-Adjustment of the rod length:
a) Turn the lock coupler clockwise to loose
position
b) Pull out the carbon handle beneath that of
the detector. Adjust the length so that the
search head is at 2 to 5 cm above the ground
when standing and holding the detector loose
by your side. Then lock the coupler back into
its original position.
-Connect the cable to the search head:
a) Wrap the search head cable round the rod.
Leave it loose so that you can level the search
head when scanning uneven ground.
b) Plug the search head cable into the
corresponding socket (for IB and PI) in the
control unit back panel, next tighten the
connector with the attached nut.
2.2. Battery charging
Your metal detector is equipped with a built-in
battery and it needs no other batteries for its
work.
If the detector is on, turn it off with the POWER
switch (the instrument is turned off when the
switch is in middle position). Plug in the
charging unit cable into the charging socket in
the back panel of the control unit. Then plug the
charging unit into the socket. During the
charging process the charging unit red indicator
is on. The battery is fully charged for 12 hours.
One battery cycle provides a 20-40-hours work
of the the instrument.
You can prolong the battery life cycle if you
work with headphones which are less energy
consuming than the built-in speakers.
BATTERY TESTING: If, on turning the
instrument on, the battery state indicator – BAT
is on, but the detector still does not start, if
there is a sound but yet very weak or if the
instrument cannot be adjusted properly and is
unstable, then you need to charge the batteries.
2.3. Use of headphones
You can connect the headphones so that you
are the only one to hear the sound in them.
Using headphones will also enhance the battery
efficiency and life cycle and they facilitate the
sound identification to end up with better
detection (search) results. To connect the
headphones, simply plug their connector into
the PHONE socket on the control unit front
panel. On this, the built-in speaker
automatically switches off. The GRIZZLY
TWINS set is equipped with a pair of
professional stereo headphones.
SAFE HEARING:
To protect your hearing be aware of the
following:
- Before putting the headphones on make sure
you have adjusted the volume of the sound to
the lowest level. Then you can adjust the sound
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GRIZZLY - TWINS USER’S GUIDE p. 6
to your liking.
- Do not turn the sound up too much.
Continuous exposure to loud noise sounds can
cause permanent loss of hearing.
− Once adjusted to taste, the volume of the
sound should not be increased. Before long
your hearing will adapt to the sound and you
will be able to hear the signals from the
detectors.
MIND THE TRAFFIC:
Do not wear the headphones in heavy traffic.
Although certain headphones allow you to hear
sounds from the environment, using them at
noisy places can be risky.
Fig.2.1.
ІІІ. CONTROL UNIT AND BACK PANEL
/Fig.2.1./
The POWER switch will turn the instrument
on and off, as well as to switch between IB
and PI mode /fig.3.1./:
Fig.3.1.
2. Back panel /fig.3.2./;
− Charging unit socket;
− Signal outlets – produce a sound of a certain
frequency at the detection of metal objects
− 5 - pin socket for IB search heads
− 2 – pin socket fro PI search heads
Fig.3.2.
GRIZZLY - TWINS USER’S GUIDE
IV. HOW TO WORK WITH THE PULSE
INDUCTION METAL DETECTOR
Grizzly Twins Digital PI was designed by a
new technology in which the signal 'back
integration' used with this type of instruments
(Pulse Induction) was replaced by a
contemporary analog-to-digital converter and a
microprocessor.
The POWER switch is normally in middle
position, the detector being turned off. Turn the
switch to the left (towards IB) and there will be a
slight click, which means that the instrument is
working in IB mode. To disable the mode leave
the switch in middle position and turn the
POWER switch right (towards PI), you will hear
a click that means the PI mode is enabled. To
turn off simply leave the POWER switch in
middle position.
Turn the POWER switch right (towards PI) and
you will hear a quiet click, the instrument is now
working in PI mode. To exit the mode, leave the
POWER switch in middle position.
Fig..4.1.
4.1 Control functions
The front panel has 4 buttons on it with the
following functions:
On pressing one of these
buttons you decrease or increase the silent
threshold.
ZERO or reset. The button also
confirms each change of a parameter in the
menu.
This button is to enter the menu as
well as to cancel an adjustment.
4.2 Information on the display:
Fig.4.2.
The first line shows the strength of the signal.
The second line gives the following values
(fig.4.2.)
Т хх V x xx.x V
T xx– Threshold – is the Threshold which can
be directly adjusted by the left and right arrows
without having to enter the menu.
V x - Volume
5 xx.x V – U batt – Shows the battery voltage
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GRIZZLY - TWINS USER’S GUIDE p. 8
4.3 Menu
Press the MENU button to enter the
menu and change the setting. Use the left and
right arrows to move up and
down within the menu items. To enter a
submenu, press the ENTER/ZERO buttonе.
- Volume
- Light
- U min of batt
- Guard interval
- Ground adjust
- Volume raise
Fig.4.3.
Description:
Volume – Sound from a minimum level of 0 to
a maximum level of 7 (fig. 4.3).
Light – Backlight – By default the setting is ON,
but this menu will allow you to turn it off. (fig.
4.3)
Fig.4.4.
U min of batt - The minimum voltage at which
the instrument will alarm a weak battery. The
minimum user's adjustment step is100 mV.
(fig.4.4. and fig.4.5.)
Fig.4.5.
Guard interval – The coil settings (fig. 4.6.)
-auto – At each start of the instrument it will
adjust to the installed search head
automatically.
Fig.4.6.
-last - In case you will not use a different
search head and you will scan with the head
the instrument has already been set to work
with, you need not waste time and wait for the
detector to adjust to it, at the next start the last
settings will be applied.
-You can manually change the setting for
the Ground interval from 2 to 80; this
parameter can be used as an additional
function to eliminate the signals from the
ground if such are present and cannot be
neutralized with the Ground adjust function.
If the instrument detects signals from the
ground at setting of 20, for example, a lower
number will cause unstable work and false
signals but higher sensitivity at the same time.
The greater this number is, the less sensitive
but more stable the instrument will be. In cases
when the ground signals cannot be eliminated
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GRIZZLY - TWINS USER’S GUIDE p. 9
by adjusting the three parameters of Ground
adjust, this number has to be manually
increased.
4.4 Ground adjust / fig.4.7./ – This function
has three software approaches to neutralize the
ground at different scan modes.
-off(static) - Ground balance is turned off or
this is also called static mode or 'if there is an
object, there is a signal'.
-adaptive - Adaptive processing of the signal 1st dynamic mode.
* When holding the search head still above a
target the signal dies away, the head must be in
motion so that the detector produces a sound.
-fixing - fixed software Ground balance
adjustment - 2nd dynamic mode.
Fig.4.7.
* This mode is a combination of the previous
two modes with the search head being in
motion all the time. Keep in mind that this mode
is slower, i.e. if you reach out a coin towards
the search head in adaptive mode, then take it
away and back again, the instrument will detect
the coin, while in fixing mode and especially
when the search speed is higher, it is likely that
the target does not produce a sound.
Fig.4.8.
Volume raise /fig.4.8. & fig.4.9./
-1/32, 1/16/ 1/8, ¼, ½ , 1 – This parameter is
used to slow down the increase of the sound
level at the beginning of the scale. It improves
the stable work of the scheme at lower
threshold. This parameter is reciprocal to the
instrument sensitivity. So it is the most sensitive
at 1/32 and when the silent threshold is low, it
ought to be closer to 1.
Fig.4.9.
4.4 Work with PI DIGITAL TWINS
Start work with PI DIGITAL TWINS in a few
steps only:
You are highly advised to work and test the
instrument in the open!
Lift the search head to 40 – 50 cm above the
ground and turn the detector on.
A TUNE.. message will be displayed and a
countdown will start. fig.4.10.
Fig.4.10.
When the PI DIGITAL TWINS is ready to start,
you will hear a three-pitch tune. Lower the
search head to a distance 4 – 5 cm off the
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GRIZZLY - TWINS USER’S GUIDE p. 10
ground (5-15 cm for larger coils) and move it in
parallel with it.
If PI DIGITAL TWINS produces a signal, press
the ZERO button, if there is still no effect, press
the plus arrow and then ZERO again. Repeat
the steps of this procedure until the instrument
does not detect the ground any longer at
normal speed of the search head. When doing
this, make sure there are no metal objects in
the ground.
If you have reached to a silent threshold of 15
and the instrument still, whenever moved, goes
off, change the setting for Menu: Ground
adjust.
If the threshold is 15 and neither of the menu
adjustments of Ground adjust work and the
instrument keeps producing ground signals
when moved, you may have to consider that the
place you have chosen to scan has a great
deal of metal trash in it. Try a different spot or
as an extreme option at 'severe ground', you
may have to manually adjust the instrument's
parameters to be able to search the lot. This
can be done by changing manually the setting
for Menu: Guard Interval like this. If on turning
the detector on, the TUNE... countdown stops,
for example, at 30, then the value is to be
increased by means of (-) and (+) buttons to
31and then confirmed with ENTER. Exit the
menu (ESC) and press the ZERO button. Test
the instrument on the respective type of ground
and if necessary, increase the value to 32. Mind
that this is applicable to places with a great
number of metal trash; normally, high values of
this parameter will not increase the instrument's
sensitivity.
If you wish to increase the detector's sensitivity
in the above case, you need to set the
parameters to lower values, i. e. 29, 28, 27 in
the above said way.
When manually changing the Guard interval
setting, the instrument may become unstable
and less sensitive, but an experienced user
may manipulate these to work with the detector
on grounds that are normally considered
unsearchable.
V. HOW TO WORK WITH THE IB
DETECTOR
Use the POWER switch to turn on/off the
instrument as well as to switch between the IB
and PI mode. Normally the switch is in middle
position, then, the instrument is off. Turn the
POWER switch to the left (towards IB) and you
will hear a low click, this means the detector is
started in IB mode.
To turn off leave the POWER switch in middle
position. fig.5.1.
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GRIZZLY - TWINS USER’S GUIDE p. 11
Fig.5.1.
5.1. Control knobs fig. 5.2.
• Discrimination mode switch: The switch has
two positions: 1 – Left position (GEB), in this
mode the discrimination is off, i.e. the
instrument detects all metals and produces a
consistent sound; 2 - Right position (DISK),
when the instrument discriminates the metals,
.i.e. at detection of non-ferrous metal targets it
gives out a consistent sound versus broken
and inconsistent signals when detected ferrous
objects.
Fig.5.2.
• VOLUME knob: Use this control to increase or
decrease the signal out of the speaker;
• TUNE knob (for adjustment of the critical
signal). The TUNE knob controls the silent
threshold. Turn the knob right and you will hear
a slowly increasing signal, with the help of the
knob set this signal very weak. This weak signal
is called critical signal (silent threshold). The
instrument is the most sensitive when it works
at the signal threshold setting.
• DISK knob (to increase or decrease the
discrimination level). It controls the instrument's
level of discrimination the discrimination being
higher at greater numbers at the DISK knob,
namely the instrument will produce a consistent
signal (Discrimination ON) when it detects purer
non-ferrous metals and its sound will be broken
and inconsistent when the detected object is
iron.
• GEB knob (to control mineralized ground
detection): Turn the knob left or right to
neutralize the signals from the ground, i.e. this
control allows to ground balance the instrument
in IB mode.
5.2. Work with the detector in IB mode
Switch the detector in IB mode (POWER button
from middle to left position towards IB until you
hear a click). Disable the dicrimination function
(the DISK switch is turned towards GEB) (fig.
5.2.) Adjust the silent threshold level with the
TUNE knob. Lift the instrument to 40-50 cm off
the ground. While holding the search head at
about 40-50 cm above the ground: 1. Turn the
TUNE knob to the rightmost position; 2. Put the
GEB knob in middle position; 3. Keep the
instrument in the air. You will hear a strong and
continuous signal. 4. With the instrument still in
the air, now slowly turn the TUNE knob to the
left, the signal becoming weaker and weaker or
even dying out (This is the silent threshold. The
instrument detects deepest targets when you
hear its signal like humming); 5. Lower the
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GRIZZLY - TWINS USER’S GUIDE p. 12
search head to 2-5 cm above the ground (down
position); MIND THE FOLLOWING:
І. If, on its lowering to the ground, the
instrument produces a signal, do the following:
lift the detector again at 40-50 cm above the
ground and slightly turn left the GEB knob.
Then place the search head at 2-5 cm above
the ground again (down position) and check if it
will produce a signal. If there is no sound from
the speaker, you have done the GROUND
BALANCE (i.e. the detector is ready to be used
at these ground conditions), but if it still goes off
when approaching the ground, repeat the
above described steps (underlined text) until
the instrument is silent with the search head
being moved downwards closer to the ground.
ІІ. If the instrument produces a signal when
being lifted, do the following: lift the search
head 40-50 cm above the ground and
slightly turn the GEB knob to the right. Then
place the search head at 2-5 cm above the
ground (down position) and lift it again. If you
can hear a signal from the instrument, repeat
the above steps again.
The instrument is GROUND BALANCED if it
does not go off when you lower or raise the
search head (that means that the detector is
ready to be used).
In case that the instrument produces signals
both on lowering towards and lifting from the
ground, then decrease the sensitivity by really
slightly turning the TUNE knob left. After the
settings have been made, you can test the
instrument. While scanning, hold the detector
firm, make a smooth and easy swing with the
search head at 2-5 cm over the ground. Now
you can begin searching.
5.3. Test and use of the instrument in the
open
(1) Look for a parcel where you are certain
there are no metal objects.
(2) Place a target object of the type you
would like to search in the ground. If you use a
gold object for the test, make sure you have
marked the place where you have buried it or
you might not be able to find it later.
(3) Holding the search head at 2-5 cm above
the ground, slowly swing it left and right over
the buried object.
VІ. CARE AND MAINTENANCE
1. If the detector does not work properly, one
possible reason might be a weak battery.
Recharge it.
2. The search head plug must be dry or the
detector will not perform properly. It can be
used only after having been dried up well.
3. Do not use the detector in wet and
rainy weather or at very high temperatures.
4. Do not put the search head close to ovens
or other hot objects.
5. The instrument comes with warranty and
it could be repaired if the warranty is still valid at
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GRIZZLY - TWINS USER’S GUIDE p. 13
the time of the instrument's failure. However,
the warranty is considered void if the
instrument's seal has been removed by the
user.
Useful advice
• Use high-quality headphones.
• Be persistent in your practice and soon you
will have your own style of searching.
• If you have difficulties when using the
instrument, read this manual over.
False signal
Radio and television signals can interfere with
the instrument. To avoid this, step further away,
decrease the silent threshold and slow down
your pace.
Highly mineralized soils and wet sands normally
produce distinct and static signals, too. If so,
decrease the silent threshold and go on
scanning.
If you hold a metal tool in one hand to help you
dig out detected targets, bear in mind that it will
cause GRIZZLY TWINS to produce a signal
whenever you put it closer to the search head.
Better carry this tool in you rucksack on your
back or hung up on your belt. In practice, to
gain satisfactory skills with the GRIZZLY
TWINS, at least 30-40 hours of work are
needed.
To stay informed about all novelties concerning
your metal detector, visit
www.grizzlymetaldetectors.com
ETHICAL CODE
It is a must that you have an exemplary behaviour. Here are some basic rules to follow when
searching with your metal detector:
Make sure you have the land owners' permission to search a place.
Respect other people's rights and possessions. Observe all local and national laws. Do not
damage historical or archaeological sites and objects. Do not search at archaeological sites. If you
come across a find or you dig out a valuable object (even not certain of its value), contact a local or
a national museum. Do not search military sites and ranges. Do not disturb the lawn or the
landscape. Fill up all your digs. Use the instrument at safe places only. If you find rubbish, take it
away to the designated places. Do not leave it there for the next digger.
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