impact Nokta User manual
WARNINGS
READ CAREFULLY BEFORE OPERATION OF THE DEVICE
LEGAL DISCLAIMERS
►
Comply with applicable laws and regulations governing use of metal detectors
while using this detector. Do not use the detector without authorization in protected or
archeological sites. Do not use this detector around unexploded ordnance or in restricted
military zones without authorization. Notify appropriate authorities with details of any
historical or culturally significant artifacts you find.
WARNINGS
►
IMPACT is a state-of-the-art electronic device. Do not assemble or operate the device
before reading the user manual.
►
Do not store the device and search coil under extremely low or high temperatures for
extended periods. (Storage Temperature: - 20°C to 60°C / - 4°F to 140°F)
►
Do not immerse the device or its accessories (except for the search coil) in water. Do not
expose equipment to excessively humid environments.
►
Protect the detector against impacts during normal use. For shipping, carefully place
detector in original carton and secure with shock resistant packaging.
►
IMPACT metal detector may only be disassembled and repaired by Nokta Authorized
Service Centers. Unauthorized disassembly/intrusion into the metal detector control
housing for any reason voids the warranty.
IMPORTANT
IMPORTANT
Do not use the device indoors. The device
may constantly give target signals indoors
where there are many metals present. Use
the device outdoors, in open fields.
Do not let another detector or an electro-
magnetic device come in close proximity
(10m (30ft.)) to the device.
Do not carry any metal objects while using
the device. Keep the device away from your
shoes while walking. The device may detect
the metals on you or inside your shoes as
targets.
For Consumers within the European Union: Do not dispose
of this equipment in general household waste. The crossed
wheeled bin symbol on this equipment indicates this unit
should not be disposed of in general household waste, but
recycled in compliance with local government regulations
and environmental requirements.
FCC STATEMENT
This device complies with Part 15 of the FCC Rules. Operation is subject
to the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
TABLE OF CONTENTS
ASSEMBLY.......................................................................................................................................................
INTRODUCTION TO THE DEVICE.................................................................................
BATTERY INFORMATION..........................................................................................................
DISPLAY.............................................................................................................................................................
CORRECT USE...........................................................................................................................................
QUICK GUIDE............................................................................................................................................
GROUND BALANCE..............................................................................................................
TARGET ID.........................................................................................................................................
SEARCH MODES (MODE)..........................................................................................
SETTINGS...........................................................................................................................................
BASIC SETTINGS.........................................................................................................
EXPERT SETTINGS...................................................................................................
PINPOINT.....................................................................................................................................................
TARGET DEPTH...................................................................................................................................
LARGE OR SHALLOW TARGETS.................................................................................
FALSE SIGNALS AND REASONS................................................................................
MAGNETIC MINERALIZATION INDICATOR....................................
ROCKS AND SEARCHING IN ROCKY TERRAINS.....................
TRACKING AND EFFECTS OF ROCKS...............................................................
METALS UNDER ROCKS..............................................................................................
SEARCHING IN SHALLOW WATER AND BEACH...............................
MESSAGES.................................................................................................................................................
SOFTWARE UPDATE...................................................................................................................
TECHNICAL SPECIFICATIONS.......................................................................................
1
2
3
4
5
6
7-10
10-11
12-15
16-24
16-20
21-24
25
26
26
26
26-27
27-28
28
28-29
29
30
30
31
1
6
9
5
7
8
2
3
24
4
Page 1
ASSEMBLY
(1) Insert the search coil cable through the hole at
the back of the lower shaft.
(2) Insert the washers on the lower shaft yoke.
(3) Insert the lower shaft yoke between search coil
mount tabs.
(4) Attach the search coil to the lower shaft using
the lever and winged nut without over-tightening.
(5) Fully insert the middle shaft into the lower shaft
and push it until it contacts the stopper. Then,
secure with the lever latch. If the lower shaft is not
inserted fully, the connector at the end of the cable
will not come out from the top of the shaft in the
next step.
(6) Join the two connectors of the system box cable
and coil cable paying attention to the pins, then
tighten. The system box cable is a retractable spiral
and you can pull it in case you cannot join the two
connectors easily.
(7) Join the middle and the upper shafts. Pull the
excess cable out of the hole and push the lever
latch on the upper shaft to secure. To adjust the
shaft length, loosen the lever latch on the middle
shaft, adjust the length to your height and press
the latch to secure.
(8) To adjust the armrest, loosen the bolts. Slide the
armrest up and down to adjust it to your arm and
secure by tightening the bolts.
(9) Adjust the armrest strap to your comfort.
Page 2
INTRODUCTION TO THE DEVICE
LCD Display
SELECT button to access the
basic settings
Keypad for navigation among
menu options and changing the
device settings
EXPERT button to access the
expert settings
LED flashlight
On / Off and volume / overload
volume adjustment button
Headphone jack
Battery compartment cover
Speaker
Ground balance and pinpoint trigger
1Push down on the tabs on both sides and pull the
cover up in the direction of the arrow shown in
the picture.
Install the batteries, making sure to match the
positive and negative ends of the batteries to
the correct contacts.
Place the battery cover in the direction of the
arrow shown in the picture. Push down on the
tabs to get the cover click into its place.
2
3
Page 3
BATTERY INFORMATION
BATTERY INSTALLATION
The device is supplied with 4 AA Alkaline batteries.
The device can be used for approximately 9-17 hours based on the operating frequency
chosen. Battery life will be less in 5kHz compared to other frequencies. Other factors such
as LED flashlight usage and usage of speaker or wired/wireless headphones will also affect
battery life.
AA Alkaline batteries are recommended for the best performance. Good quality Ni-MH
rechargeable batteries can be used, instead. Rechargeable batteries with high mAh (capacity)
ratings offer extended operating times versus batteries with lower rating. Do not mix alkaline
and rechargeable batteries.
Low Battery Level
Battery icon on the display shows the battery life status. When the charge decreases, the
bars inside the battery icon decrease, too. "Lo" message appears on the display when the
batteries are depleted.
Page 4
DISPLAY
2
3
4
8
9
10
6 7
1
5
(1) Target ID scale.
(2) Cursor showing the ID of the detected target on the ID scale. It also indicates the IDs
filtered by Disc. and Notch Filter settings as well as the tone breakpoints. In the Static
modes, it indicates the signal strength.
(3) Search Modes.
(4) Basic Settings.
(5) Section which shows the warning messages.
(6) Section which shows the Target ID upon target detection, the ground balance whole
number value during ground balancing and the estimated target depth in the pinpoint
mode. In addition, the numeric value of any setting selected from the menu is displayed
in this field.
(7) Magnetic mineralization indicator.
(8) Expert Settings.
(9) Section which shows the fine tuning value during ground balance adjustment and
current ground balance value during search.
(10) Battery level indicator.
Page 5
CORRECT USE
CORRECT WAY OF SWEEPING
Shaft height is wrong Shaft height is correct
It s very mportant to adjust the shaft to your
heght correctly to be able to search wthout
dscomfort and fatgue.
Adjust the heght of the shaft so that you are
standng n an uprght poston, your arm s
relaxed and the search col s approxmately
5cm (~2'') above the ground.
It s mportant to keep the search col
parallel to the ground n order to get
accurate results.
The search col must be parallel to the
ground at all tmes.
Wrong search coil angle Wrong search coil angle Correct search coil angle
Incorrect way of sweeping Correct way of sweeping
Page 6
QUICK GUIDE
1) Assemble the device as per the instructions on page 1.
2) Insert the batteries by paying attention to +/- polarity.
3) Rotate the on/off switch located behind the device clockwise to turn on the device. This
switch also adjusts the volume of the device as well as the overload volume.
4) When the device is turned on, it will start in the DI2 mode and 14kHz operating frequency.
You can change the mode and/or the frequency based on ground conditions. For instance, if
you are detecting on wet beach sand, you may want to select the COG mode and a different
frequency. You can find more details on search modes and frequencies further in this manual.
5) To ground balance, push and hold the trigger forward and pump the search coil up and
down to 3cm (1.2'') above the ground until a “beep” sound is heard.
6) You can increase the Gain if needed. Increasing the gain will offer you greater depth.
However, if the surroundings or the ground cause excessive noise in the device, you need
to lower the gain setting.
7) Testing the device with various metals would be helpful for getting familiar with the
sounds produced by the device.
8) Based on the IDs of the metals you don't want to detect, you can adjust the Disc. setting
and ignore those metals. For instance, if you don’t want to detect ferrous metals with 00-05
ID in the DI2 mode, you can set the Disc. to 5.
9) If you are detecting in a very trashy area and the device is getting too many iron signals,
instead of Disc. you can use the Fe Vol. to lower or completely turn off the iron audio. This
will provide more depth.
10) You can filter out certain Target IDs using the Notch Filter and enable the device to ignore
these metals during searching or to provide an iron audio for them.
11) If you wish, you can adjust the tone break points of the device with the Tone Break
feature and change the frequency of the tones using the Audio Tone setting.
12) You can now start searching.
13) Since your device operates with the motion principle, swing the search coil right and
left maintaining 5cm (2") distance above the ground. If the search coil does not move, the
device will not provide any audio responses even if the coil is over a metal target (except
for the STATIC modes).
14) When a target is detected, the ID of the target will be displayed on the screen and the cursor
will indicate its position on the ID scale. (If you wish, you can adjust the ID Depth Level of the
device). The device will also produce an audio response according to the search mode selected.
15) Upon target detection, you can pinpoint the exact location of the target by pulling
and holding the trigger back. The audio volume will increase and the audio pitch will also
increase as you approach the target.
Page 7
GROUND BALANCE
Ground balance can be performed in three ways with the IMPACT: Automatic, Manual and
Tracking (Track).
If the trigger is pushed forward while performing automatic or manual ground balance,
the device will switch to the General Search (GEN) mode automatically on the background
without any indication to the user, regardless of the selected search mode.
Upon completion of ground balance, current ground balance value is shown in the Ground
Balance (GB) box on the right side of the display.
Automatic Ground Balance
Automatic ground balance is performed as follows in all search modes:
1) Find a spot where there is no metal.
2) Push the ground balance trigger forward (GROUND BALANCE value and “Pump the Coil”
warning message will be shown on display) and start pumping the search coil up and down
from about 15-20 cm (~6''- 8'') above the ground down to 3 cm (~1'') off the ground with
smooth movements and keeping it parallel to the ground.
3) Continue until a beep, indicating the completion of ground balance, is heard. Based on
ground conditions, it usually takes about 2-4 pumps for the ground balance to be completed.
4) Upon completion of the ground balance, ground balance value is shown on the display
(GB). The device continues to ground balance and produce a beep sound as long as you keep
the trigger pushed forward and pump the coil. In order to ensure that the ground balance is
proper, ground balance at least 2-3 times and check the ground balance values on the display.
In general, the difference between the values shall not be higher than 1-2 numbers.
5) If you cannot ground balance, in other words, if no beep sound is produced, it means that
either the ground is too conductive or not mineralized or there is a target right below the
search coil. In such a case, retry ground balance at a different spot. If you still cannot ground
balance, read the section titled “Important Details Concerning Ground Balance”.
When the ground balance trigger is released, the device continues to operate in the GEN
mode for a short period of time and the ground balance value stays on display. This makes
it possible to manually fine tune the automatic ground balance value. Refer to the following
“Manual Ground Balance”section for further information regarding this feature. If this is not
desired, pull and release the trigger once to return to the main screen.
Page 8
NOTE: If the iSAT value is set high, the device may not auto ground balance. In such a case,
lower the iSAT value first. After ground balancing, set the iSAT back to its original position.
Manual Ground Balance
Allows you to manually modify the ground balance value. It is not preferred mostly because
it takes time. However, it is the preferred option in cases where a successful ground balance
cannot be performed using other methods or minor corrections are required to the
automatic balance.
IMPACT is designed to allow for automatic ground balancing conveniently on any type of
ground. Therefore, it is recommended to perform automatic ground balance upon start up.
However, the ground may not be suitable for automatic ground balancing in some cases
and the device cannot ground balance on such grounds (Except for the COG mode). For
instance, wet beach sand, soils containing alkali or salty water, trashy sites, ploughed fields,
highly mineralized grounds and grounds with very low mineralization are not suitable for
automatic ground balance. In such terrains, you can auto ground balance in the COG mode
and then switch to other modes or try manual ground balancing. However, manual ground
balance requires a skill which develops over time through practice.
To perform manual ground balance:
1) Find a clear spot without metals and switch the device to the GEN mode.
2) You need to listen to the sounds coming from the ground in order to perform manual
ground balance. Pump the search coil up and down from about 15-20 cm (~6''- 8'') above
the ground down to 3 cm (~1'') off the ground with smooth movements and keeping it
parallel to the ground.
If the sound gets higher when lifting off the search coil above the ground, the ground
balance value is too low, in other words, the effect from the ground is negative and the
ground balance value needs to be increased by using the ( + ) button. On the other hand,
if the sound gets higher when lowering the search coil to the ground, the ground balance
value is too high, in other words, the effect from the ground is positive and the ground
balance value needs to decreased by using the ( - ) button.
3) Push the ground balance trigger forward once and release it. The ground balance value
will be shown on the display and remain there for a moment. You can return to the ground
balance screen by pushing the ground balance trigger forward if the screen switches.
Manual ground balance functions within the range
of 0-99. However, each value covers 5 steps used
for fine tuning within itself and these steps are
indicated as multiples of 20 in the Ground Balance
window (GB). For example, ground balance value
shown on the side is 70.80.
Press ( + ) or ( - ) to increase or decrease the ground
balance value, respectively. If the key is pressed
once at a time, the values count one by one and if it is held down, the values will change
quickly.
4) Repeat the above procedure until the sound heard from the ground is eliminated.
The sound may not be eliminated completely in some areas. In these cases, listen to the
sounds produced when moving the search coil towards and away from the ground to check
if the ground balance is correct. If there is no difference between the two sounds then the
ground balance is set properly.
The device will return to the main screen automatically after a short period of time upon
completion of ground balance. To return to the main screen instantly, just pull and release
the trigger once.
IMPORTANT! Experienced detectorists adjust the ground balance setting to a slightly posi-
tive response (weak but audible sound is produced when moving the search coil closer to
ground). This method may produce favorable results for experienced users in certain fields
where small targets are searched for.
Ground Tracking (Track)
In this option, the user does not need to make any adjustments. Tracking feature is activated
from the menu by switching it to 01 position. The word ''Track'' is displayed at the bottom of
the screen. The device updates the ground balance automatically as long as the search coil is
swung over the ground and shows the ground balance value in the GB window. It does not
provide any feedback to the user (like the beep sound in automatic ground balance).
While tracking is active, the device can initially produce a loud signal when it detects a
different ground structure (for instance a mineral rock) or a target. In this case, swing the
search coil over the spot where the device produces the signal . If the sound remains the
same and the device shows an ID, it is possibly a target. If the sound attenuates too much
or is lost after a few swings, it means that the device has produced a signal for the different
ground structure or a stone.
NOTE: It is recommended that you use tracking in the General Search modes (GEN and GEN
(D)) and not in the discrimination or static modes.
Tracking is suitable for use in areas where different soil structures are present within the
same land or in fields where mineralized rocks are scattered widely apart. If you use ground
tracking in areas where hot rocks are intensely present, the device may not be able to elimi-
nate these highly mineralized rocks or you may miss the smaller or deeper metals.
IMPORTANT! Ensure that tracking is off during air tests. Otherwise, the device will attempt
to perform ground balance on the target and the depth will be reduced.
Ground Balance Value
Ground balance value provides information about the ground you are searching on. Some
typical ground types are as follows:
0-25 Wet salt water or wet alkali soils
25-50 Wet salt water and wet alkali soils covered with dry layers
50-70 Regular, low-quality soils
70-90 Highly magnetic soils, magnetite or maghemite and similar highly mineralized soils,
black sand.
Important Details Concerning Ground Balance
1) Upon start up, the ground balance value is set to 90. The device can perform ground
balance automatically within the range of 20-90 in all modes and 00-90 in the COG mode.
2) If the ground mineralization is too low, automatic ground balance may fail to work in
other modes except for the COG mode. In such a case, you can auto ground balance in the
COG mode and then switch to other modes or try manual ground balancing.
3) You can test the accuracy of the ground balance with the pinpoint mode. After ground
balancing, if you receive no sound or a weak one when you move the search coil closer to
the ground in the pinpoint mode, then the ground balance is successful. If the sound gets
louder when you move the search coil closer to the ground, then the ground balance is not
successful. In this case, simply change your location. If ground balance is not possible despite
these efforts, you should continue your search without performing ground balance.
You cannot search in the General Search and Static modes without ground balancing. You need
to use one of the discrimination modes and increase the Disc. value until the noise is eliminated.
4) Once the ground balance is set, it will remain satisfactory for a long time in most areas.
However, if you encounter an excavated, backfilled or geologically composite soil structure,
a ground balance should be performed again to adapt to the varying soil structure. In
addition, re-ground balancing is recommended if you change the operating frequency of
the device (5kHz/14kHz/20kHz) in certain ground conditions.
5) When using the optional large coil, pump the coil more slowly and do not keep it very
close to the ground.
6) In some cases where the iSAT value is set high, the device may not be able to ground
balance automatically. In such a case, first lower the iSAT and after ground balancing switch
it back to its previous position.
TARGET ID is the number produced by the metal detector based on the conductivity of the
metals and gives an idea to the user about what the target may be. Target ID is shown with
two digits on the display and ranges between 00-99.
NOTE: Keep in mind, large targets will ID higher than expected, even though they may be
of lower conductance.
In some cases, the device may produce multiple IDs for the same target. In other words, the
IDs may be jumpy. This may result from several factors. Target orientation, depth, purity of
the metal, corrosion, mineralization level of the soil etc. Even the direction of the search coil
swing may cause the device to generate multiple IDs.
In some cases, the device may fail to provide any ID. The device needs to receive a strong and
a clear signal from the target in order to provide an ID. Therefore, it may not be able to provide
an ID for targets at fringe depths or smaller targets even if the device detects them.
Keep in mind that target IDs are“probable”, in other words, estimated values and it would
not be possible to know the properties of a buried object exactly until it is dug out.
IDs of non-ferrous metals such as copper, silver, aluminum and lead are high. Target ID range
of gold is wide and may fall within the same range of metal wastes such as iron, foil, screw
caps, and pull tabs. Therefore, if you are looking for gold targets, digging out some trash
metals is expected.
IMPACT utilizes 2 different ID scales according to the search modes. In DI2, DI3, DI4, DI99 and
COG modes, the ferrous range is 00-15 at factory defaults. In GEN, GEN (D), STA, STA (D), DEEP,
VLX1 and VLX2 modes, the ferrous range is 00-40. In addition, when the operating frequency
is changed, the Target ID will change as well. This represents the ''Standard'' ID scaling of the
device.
IMPORTANT! At start up, IMPACT will utilize the ''Normalized'' ID scale and not the
Standard ID scale. In other words, the IDs will not change upon frequency change and
the device will generate the 14kHz IDs in each frequency. However, based on ground
conditions IDs may vary for certain metals.
If you prefer to see the different IDs produced by each frequency, you need use the
''Standard'' ID scale. To switch to the standard IDs, pull the trigger and push the (+) button
at the same time. Letters ''Sd'' will appear on the screen. If you wish to revert back to the
normalized IDs, repeat the same process and letters ''no'' will appear on the screen.
Tables outlining the search modes and ID ranges as well as the probable IDs for each
frequency are placed at the back of this manual. You can easily detach the pages and
carry them with you during your searches.
Coins searched throughout the world are made of different metals and in different sizes in
different geographical locations and historical eras. Therefore, in order to learn the Target
IDs of the coins in a specific region, it is suggested to perform a test with the samples of such
coins, if possible.
It may take some time and experience to make best use of the Target ID feature in your
search area. Different brands and models of detectors produce different target ID numbers.
The numbers vary even more depending on target depth, ground mineralization, and
adjacent metals. But after some practice, you will quickly become comfortable with the
meanings of the IMPACT's Target IDs.
Target ID Depth
This setting is not present in the menu.
Adjusts the depth level that the device displays an ID for a detected target. It consists of 3
levels: Hi (High), In (Intermediate), Lo (Low). Factory default is set to ''In''.
The lower the ID depth level is, the higher the ID accuracy and vice versa. At the high level,
the IDs may become jumpy.
To change the ID depth level, pull the trigger and press the up button simultaneously. Each
time you press the up button, the ID depth level will change.
GROUND BALANCE
NOTE: If the iSAT value is set high, the device may not auto ground balance. In such a case,
lower the iSAT value first. After ground balancing, set the iSAT back to its original position.
Manual Ground Balance
Allows you to manually modify the ground balance value. It is not preferred mostly because
it takes time. However, it is the preferred option in cases where a successful ground balance
cannot be performed using other methods or minor corrections are required to the
automatic balance.
IMPACT is designed to allow for automatic ground balancing conveniently on any type of
ground. Therefore, it is recommended to perform automatic ground balance upon start up.
However, the ground may not be suitable for automatic ground balancing in some cases
and the device cannot ground balance on such grounds (Except for the COG mode). For
instance, wet beach sand, soils containing alkali or salty water, trashy sites, ploughed fields,
highly mineralized grounds and grounds with very low mineralization are not suitable for
automatic ground balance. In such terrains, you can auto ground balance in the COG mode
and then switch to other modes or try manual ground balancing. However, manual ground
balance requires a skill which develops over time through practice.
To perform manual ground balance:
1) Find a clear spot without metals and switch the device to the GEN mode.
2) You need to listen to the sounds coming from the ground in order to perform manual
ground balance. Pump the search coil up and down from about 15-20 cm (~6''- 8'') above
the ground down to 3 cm (~1'') off the ground with smooth movements and keeping it
parallel to the ground.
If the sound gets higher when lifting off the search coil above the ground, the ground
balance value is too low, in other words, the effect from the ground is negative and the
ground balance value needs to be increased by using the ( + ) button. On the other hand,
if the sound gets higher when lowering the search coil to the ground, the ground balance
value is too high, in other words, the effect from the ground is positive and the ground
balance value needs to decreased by using the ( - ) button.
3) Push the ground balance trigger forward once and release it. The ground balance value
will be shown on the display and remain there for a moment. You can return to the ground
balance screen by pushing the ground balance trigger forward if the screen switches.
Manual ground balance functions within the range
of 0-99. However, each value covers 5 steps used
for fine tuning within itself and these steps are
indicated as multiples of 20 in the Ground Balance
window (GB). For example, ground balance value
shown on the side is 70.80.
Press ( + ) or ( - ) to increase or decrease the ground
balance value, respectively. If the key is pressed
once at a time, the values count one by one and if it is held down, the values will change
quickly.
Page 9
4) Repeat the above procedure until the sound heard from the ground is eliminated.
The sound may not be eliminated completely in some areas. In these cases, listen to the
sounds produced when moving the search coil towards and away from the ground to check
if the ground balance is correct. If there is no difference between the two sounds then the
ground balance is set properly.
The device will return to the main screen automatically after a short period of time upon
completion of ground balance. To return to the main screen instantly, just pull and release
the trigger once.
IMPORTANT! Experienced detectorists adjust the ground balance setting to a slightly posi-
tive response (weak but audible sound is produced when moving the search coil closer to
ground). This method may produce favorable results for experienced users in certain fields
where small targets are searched for.
Ground Tracking (Track)
In this option, the user does not need to make any adjustments. Tracking feature is activated
from the menu by switching it to 01 position. The word ''Track'' is displayed at the bottom of
the screen. The device updates the ground balance automatically as long as the search coil is
swung over the ground and shows the ground balance value in the GB window. It does not
provide any feedback to the user (like the beep sound in automatic ground balance).
While tracking is active, the device can initially produce a loud signal when it detects a
different ground structure (for instance a mineral rock) or a target. In this case, swing the
search coil over the spot where the device produces the signal . If the sound remains the
same and the device shows an ID, it is possibly a target. If the sound attenuates too much
or is lost after a few swings, it means that the device has produced a signal for the different
ground structure or a stone.
NOTE: It is recommended that you use tracking in the General Search modes (GEN and GEN
(D)) and not in the discrimination or static modes.
Tracking is suitable for use in areas where different soil structures are present within the
same land or in fields where mineralized rocks are scattered widely apart. If you use ground
tracking in areas where hot rocks are intensely present, the device may not be able to elimi-
nate these highly mineralized rocks or you may miss the smaller or deeper metals.
IMPORTANT! Ensure that tracking is off during air tests. Otherwise, the device will attempt
to perform ground balance on the target and the depth will be reduced.
Ground Balance Value
Ground balance value provides information about the ground you are searching on. Some
typical ground types are as follows:
0-25 Wet salt water or wet alkali soils
25-50 Wet salt water and wet alkali soils covered with dry layers
50-70 Regular, low-quality soils
70-90 Highly magnetic soils, magnetite or maghemite and similar highly mineralized soils,
black sand.
Important Details Concerning Ground Balance
1) Upon start up, the ground balance value is set to 90. The device can perform ground
balance automatically within the range of 20-90 in all modes and 00-90 in the COG mode.
2) If the ground mineralization is too low, automatic ground balance may fail to work in
other modes except for the COG mode. In such a case, you can auto ground balance in the
COG mode and then switch to other modes or try manual ground balancing.
3) You can test the accuracy of the ground balance with the pinpoint mode. After ground
balancing, if you receive no sound or a weak one when you move the search coil closer to
the ground in the pinpoint mode, then the ground balance is successful. If the sound gets
louder when you move the search coil closer to the ground, then the ground balance is not
successful. In this case, simply change your location. If ground balance is not possible despite
these efforts, you should continue your search without performing ground balance.
You cannot search in the General Search and Static modes without ground balancing. You need
to use one of the discrimination modes and increase the Disc. value until the noise is eliminated.
4) Once the ground balance is set, it will remain satisfactory for a long time in most areas.
However, if you encounter an excavated, backfilled or geologically composite soil structure,
a ground balance should be performed again to adapt to the varying soil structure. In
addition, re-ground balancing is recommended if you change the operating frequency of
the device (5kHz/14kHz/20kHz) in certain ground conditions.
5) When using the optional large coil, pump the coil more slowly and do not keep it very
close to the ground.
6) In some cases where the iSAT value is set high, the device may not be able to ground
balance automatically. In such a case, first lower the iSAT and after ground balancing switch
it back to its previous position.
TARGET ID is the number produced by the metal detector based on the conductivity of the
metals and gives an idea to the user about what the target may be. Target ID is shown with
two digits on the display and ranges between 00-99.
NOTE: Keep in mind, large targets will ID higher than expected, even though they may be
of lower conductance.
In some cases, the device may produce multiple IDs for the same target. In other words, the
IDs may be jumpy. This may result from several factors. Target orientation, depth, purity of
the metal, corrosion, mineralization level of the soil etc. Even the direction of the search coil
swing may cause the device to generate multiple IDs.
In some cases, the device may fail to provide any ID. The device needs to receive a strong and
a clear signal from the target in order to provide an ID. Therefore, it may not be able to provide
an ID for targets at fringe depths or smaller targets even if the device detects them.
Keep in mind that target IDs are“probable”, in other words, estimated values and it would
not be possible to know the properties of a buried object exactly until it is dug out.
IDs of non-ferrous metals such as copper, silver, aluminum and lead are high. Target ID range
of gold is wide and may fall within the same range of metal wastes such as iron, foil, screw
caps, and pull tabs. Therefore, if you are looking for gold targets, digging out some trash
metals is expected.
IMPACT utilizes 2 different ID scales according to the search modes. In DI2, DI3, DI4, DI99 and
COG modes, the ferrous range is 00-15 at factory defaults. In GEN, GEN (D), STA, STA (D), DEEP,
VLX1 and VLX2 modes, the ferrous range is 00-40. In addition, when the operating frequency
is changed, the Target ID will change as well. This represents the ''Standard'' ID scaling of the
device.
IMPORTANT! At start up, IMPACT will utilize the ''Normalized'' ID scale and not the
Standard ID scale. In other words, the IDs will not change upon frequency change and
the device will generate the 14kHz IDs in each frequency. However, based on ground
conditions IDs may vary for certain metals.
If you prefer to see the different IDs produced by each frequency, you need use the
''Standard'' ID scale. To switch to the standard IDs, pull the trigger and push the (+) button
at the same time. Letters ''Sd'' will appear on the screen. If you wish to revert back to the
normalized IDs, repeat the same process and letters ''no'' will appear on the screen.
Tables outlining the search modes and ID ranges as well as the probable IDs for each
frequency are placed at the back of this manual. You can easily detach the pages and
carry them with you during your searches.
Coins searched throughout the world are made of different metals and in different sizes in
different geographical locations and historical eras. Therefore, in order to learn the Target
IDs of the coins in a specific region, it is suggested to perform a test with the samples of such
coins, if possible.
It may take some time and experience to make best use of the Target ID feature in your
search area. Different brands and models of detectors produce different target ID numbers.
The numbers vary even more depending on target depth, ground mineralization, and
adjacent metals. But after some practice, you will quickly become comfortable with the
meanings of the IMPACT's Target IDs.
Target ID Depth
This setting is not present in the menu.
Adjusts the depth level that the device displays an ID for a detected target. It consists of 3
levels: Hi (High), In (Intermediate), Lo (Low). Factory default is set to ''In''.
The lower the ID depth level is, the higher the ID accuracy and vice versa. At the high level,
the IDs may become jumpy.
To change the ID depth level, pull the trigger and press the up button simultaneously. Each
time you press the up button, the ID depth level will change.
GROUND BALANCE
NOTE: If the iSAT value is set high, the device may not auto ground balance. In such a case,
lower the iSAT value first. After ground balancing, set the iSAT back to its original position.
Manual Ground Balance
Allows you to manually modify the ground balance value. It is not preferred mostly because
it takes time. However, it is the preferred option in cases where a successful ground balance
cannot be performed using other methods or minor corrections are required to the
automatic balance.
IMPACT is designed to allow for automatic ground balancing conveniently on any type of
ground. Therefore, it is recommended to perform automatic ground balance upon start up.
However, the ground may not be suitable for automatic ground balancing in some cases
and the device cannot ground balance on such grounds (Except for the COG mode). For
instance, wet beach sand, soils containing alkali or salty water, trashy sites, ploughed fields,
highly mineralized grounds and grounds with very low mineralization are not suitable for
automatic ground balance. In such terrains, you can auto ground balance in the COG mode
and then switch to other modes or try manual ground balancing. However, manual ground
balance requires a skill which develops over time through practice.
To perform manual ground balance:
1) Find a clear spot without metals and switch the device to the GEN mode.
2) You need to listen to the sounds coming from the ground in order to perform manual
ground balance. Pump the search coil up and down from about 15-20 cm (~6''- 8'') above
the ground down to 3 cm (~1'') off the ground with smooth movements and keeping it
parallel to the ground.
If the sound gets higher when lifting off the search coil above the ground, the ground
balance value is too low, in other words, the effect from the ground is negative and the
ground balance value needs to be increased by using the ( + ) button. On the other hand,
if the sound gets higher when lowering the search coil to the ground, the ground balance
value is too high, in other words, the effect from the ground is positive and the ground
balance value needs to decreased by using the ( - ) button.
3) Push the ground balance trigger forward once and release it. The ground balance value
will be shown on the display and remain there for a moment. You can return to the ground
balance screen by pushing the ground balance trigger forward if the screen switches.
Manual ground balance functions within the range
of 0-99. However, each value covers 5 steps used
for fine tuning within itself and these steps are
indicated as multiples of 20 in the Ground Balance
window (GB). For example, ground balance value
shown on the side is 70.80.
Press ( + ) or ( - ) to increase or decrease the ground
balance value, respectively. If the key is pressed
once at a time, the values count one by one and if it is held down, the values will change
quickly.
4) Repeat the above procedure until the sound heard from the ground is eliminated.
The sound may not be eliminated completely in some areas. In these cases, listen to the
sounds produced when moving the search coil towards and away from the ground to check
if the ground balance is correct. If there is no difference between the two sounds then the
ground balance is set properly.
The device will return to the main screen automatically after a short period of time upon
completion of ground balance. To return to the main screen instantly, just pull and release
the trigger once.
IMPORTANT! Experienced detectorists adjust the ground balance setting to a slightly posi-
tive response (weak but audible sound is produced when moving the search coil closer to
ground). This method may produce favorable results for experienced users in certain fields
where small targets are searched for.
Ground Tracking (Track)
In this option, the user does not need to make any adjustments. Tracking feature is activated
from the menu by switching it to 01 position. The word ''Track'' is displayed at the bottom of
the screen. The device updates the ground balance automatically as long as the search coil is
swung over the ground and shows the ground balance value in the GB window. It does not
provide any feedback to the user (like the beep sound in automatic ground balance).
While tracking is active, the device can initially produce a loud signal when it detects a
different ground structure (for instance a mineral rock) or a target. In this case, swing the
search coil over the spot where the device produces the signal . If the sound remains the
same and the device shows an ID, it is possibly a target. If the sound attenuates too much
or is lost after a few swings, it means that the device has produced a signal for the different
ground structure or a stone.
NOTE: It is recommended that you use tracking in the General Search modes (GEN and GEN
(D)) and not in the discrimination or static modes.
Tracking is suitable for use in areas where different soil structures are present within the
same land or in fields where mineralized rocks are scattered widely apart. If you use ground
tracking in areas where hot rocks are intensely present, the device may not be able to elimi-
nate these highly mineralized rocks or you may miss the smaller or deeper metals.
IMPORTANT! Ensure that tracking is off during air tests. Otherwise, the device will attempt
to perform ground balance on the target and the depth will be reduced.
Ground Balance Value
Ground balance value provides information about the ground you are searching on. Some
typical ground types are as follows:
0-25 Wet salt water or wet alkali soils
25-50 Wet salt water and wet alkali soils covered with dry layers
50-70 Regular, low-quality soils
70-90 Highly magnetic soils, magnetite or maghemite and similar highly mineralized soils,
black sand.
Page 10
Important Details Concerning Ground Balance
1) Upon start up, the ground balance value is set to 90. The device can perform ground
balance automatically within the range of 20-90 in all modes and 00-90 in the COG mode.
2) If the ground mineralization is too low, automatic ground balance may fail to work in
other modes except for the COG mode. In such a case, you can auto ground balance in the
COG mode and then switch to other modes or try manual ground balancing.
3) You can test the accuracy of the ground balance with the pinpoint mode. After ground
balancing, if you receive no sound or a weak one when you move the search coil closer to
the ground in the pinpoint mode, then the ground balance is successful. If the sound gets
louder when you move the search coil closer to the ground, then the ground balance is not
successful. In this case, simply change your location. If ground balance is not possible despite
these efforts, you should continue your search without performing ground balance.
You cannot search in the General Search and Static modes without ground balancing. You need
to use one of the discrimination modes and increase the Disc. value until the noise is eliminated.
4) Once the ground balance is set, it will remain satisfactory for a long time in most areas.
However, if you encounter an excavated, backfilled or geologically composite soil structure,
a ground balance should be performed again to adapt to the varying soil structure. In
addition, re-ground balancing is recommended if you change the operating frequency of
the device (5kHz/14kHz/20kHz) in certain ground conditions.
5) When using the optional large coil, pump the coil more slowly and do not keep it very
close to the ground.
6) In some cases where the iSAT value is set high, the device may not be able to ground
balance automatically. In such a case, first lower the iSAT and after ground balancing switch
it back to its previous position.
TARGET ID is the number produced by the metal detector based on the conductivity of the
metals and gives an idea to the user about what the target may be. Target ID is shown with
two digits on the display and ranges between 00-99.
NOTE: Keep in mind, large targets will ID higher than expected, even though they may be
of lower conductance.
In some cases, the device may produce multiple IDs for the same target. In other words, the
IDs may be jumpy. This may result from several factors. Target orientation, depth, purity of
the metal, corrosion, mineralization level of the soil etc. Even the direction of the search coil
swing may cause the device to generate multiple IDs.
In some cases, the device may fail to provide any ID. The device needs to receive a strong and
a clear signal from the target in order to provide an ID. Therefore, it may not be able to provide
an ID for targets at fringe depths or smaller targets even if the device detects them.
TARGET ID
Keep in mind that target IDs are“probable”, in other words, estimated values and it would
not be possible to know the properties of a buried object exactly until it is dug out.
IDs of non-ferrous metals such as copper, silver, aluminum and lead are high. Target ID range
of gold is wide and may fall within the same range of metal wastes such as iron, foil, screw
caps, and pull tabs. Therefore, if you are looking for gold targets, digging out some trash
metals is expected.
IMPACT utilizes 2 different ID scales according to the search modes. In DI2, DI3, DI4, DI99 and
COG modes, the ferrous range is 00-15 at factory defaults. In GEN, GEN (D), STA, STA (D), DEEP,
VLX1 and VLX2 modes, the ferrous range is 00-40. In addition, when the operating frequency
is changed, the Target ID will change as well. This represents the ''Standard'' ID scaling of the
device.
IMPORTANT! At start up, IMPACT will utilize the ''Normalized'' ID scale and not the
Standard ID scale. In other words, the IDs will not change upon frequency change and
the device will generate the 14kHz IDs in each frequency. However, based on ground
conditions IDs may vary for certain metals.
If you prefer to see the different IDs produced by each frequency, you need use the
''Standard'' ID scale. To switch to the standard IDs, pull the trigger and push the (+) button
at the same time. Letters ''Sd'' will appear on the screen. If you wish to revert back to the
normalized IDs, repeat the same process and letters ''no'' will appear on the screen.
Tables outlining the search modes and ID ranges as well as the probable IDs for each
frequency are placed at the back of this manual. You can easily detach the pages and
carry them with you during your searches.
Coins searched throughout the world are made of different metals and in different sizes in
different geographical locations and historical eras. Therefore, in order to learn the Target
IDs of the coins in a specific region, it is suggested to perform a test with the samples of such
coins, if possible.
It may take some time and experience to make best use of the Target ID feature in your
search area. Different brands and models of detectors produce different target ID numbers.
The numbers vary even more depending on target depth, ground mineralization, and
adjacent metals. But after some practice, you will quickly become comfortable with the
meanings of the IMPACT's Target IDs.
Target ID Depth
This setting is not present in the menu.
Adjusts the depth level that the device displays an ID for a detected target. It consists of 3
levels: Hi (High), In (Intermediate), Lo (Low). Factory default is set to ''In''.
The lower the ID depth level is, the higher the ID accuracy and vice versa. At the high level,
the IDs may become jumpy.
To change the ID depth level, pull the trigger and press the up button simultaneously. Each
time you press the up button, the ID depth level will change.
GROUND BALANCE
NOTE: If the iSAT value is set high, the device may not auto ground balance. In such a case,
lower the iSAT value first. After ground balancing, set the iSAT back to its original position.
Manual Ground Balance
Allows you to manually modify the ground balance value. It is not preferred mostly because
it takes time. However, it is the preferred option in cases where a successful ground balance
cannot be performed using other methods or minor corrections are required to the
automatic balance.
IMPACT is designed to allow for automatic ground balancing conveniently on any type of
ground. Therefore, it is recommended to perform automatic ground balance upon start up.
However, the ground may not be suitable for automatic ground balancing in some cases
and the device cannot ground balance on such grounds (Except for the COG mode). For
instance, wet beach sand, soils containing alkali or salty water, trashy sites, ploughed fields,
highly mineralized grounds and grounds with very low mineralization are not suitable for
automatic ground balance. In such terrains, you can auto ground balance in the COG mode
and then switch to other modes or try manual ground balancing. However, manual ground
balance requires a skill which develops over time through practice.
To perform manual ground balance:
1) Find a clear spot without metals and switch the device to the GEN mode.
2) You need to listen to the sounds coming from the ground in order to perform manual
ground balance. Pump the search coil up and down from about 15-20 cm (~6''- 8'') above
the ground down to 3 cm (~1'') off the ground with smooth movements and keeping it
parallel to the ground.
If the sound gets higher when lifting off the search coil above the ground, the ground
balance value is too low, in other words, the effect from the ground is negative and the
ground balance value needs to be increased by using the ( + ) button. On the other hand,
if the sound gets higher when lowering the search coil to the ground, the ground balance
value is too high, in other words, the effect from the ground is positive and the ground
balance value needs to decreased by using the ( - ) button.
3) Push the ground balance trigger forward once and release it. The ground balance value
will be shown on the display and remain there for a moment. You can return to the ground
balance screen by pushing the ground balance trigger forward if the screen switches.
Manual ground balance functions within the range
of 0-99. However, each value covers 5 steps used
for fine tuning within itself and these steps are
indicated as multiples of 20 in the Ground Balance
window (GB). For example, ground balance value
shown on the side is 70.80.
Press ( + ) or ( - ) to increase or decrease the ground
balance value, respectively. If the key is pressed
once at a time, the values count one by one and if it is held down, the values will change
quickly.
4) Repeat the above procedure until the sound heard from the ground is eliminated.
The sound may not be eliminated completely in some areas. In these cases, listen to the
sounds produced when moving the search coil towards and away from the ground to check
if the ground balance is correct. If there is no difference between the two sounds then the
ground balance is set properly.
The device will return to the main screen automatically after a short period of time upon
completion of ground balance. To return to the main screen instantly, just pull and release
the trigger once.
IMPORTANT! Experienced detectorists adjust the ground balance setting to a slightly posi-
tive response (weak but audible sound is produced when moving the search coil closer to
ground). This method may produce favorable results for experienced users in certain fields
where small targets are searched for.
Ground Tracking (Track)
In this option, the user does not need to make any adjustments. Tracking feature is activated
from the menu by switching it to 01 position. The word ''Track'' is displayed at the bottom of
the screen. The device updates the ground balance automatically as long as the search coil is
swung over the ground and shows the ground balance value in the GB window. It does not
provide any feedback to the user (like the beep sound in automatic ground balance).
While tracking is active, the device can initially produce a loud signal when it detects a
different ground structure (for instance a mineral rock) or a target. In this case, swing the
search coil over the spot where the device produces the signal . If the sound remains the
same and the device shows an ID, it is possibly a target. If the sound attenuates too much
or is lost after a few swings, it means that the device has produced a signal for the different
ground structure or a stone.
NOTE: It is recommended that you use tracking in the General Search modes (GEN and GEN
(D)) and not in the discrimination or static modes.
Tracking is suitable for use in areas where different soil structures are present within the
same land or in fields where mineralized rocks are scattered widely apart. If you use ground
tracking in areas where hot rocks are intensely present, the device may not be able to elimi-
nate these highly mineralized rocks or you may miss the smaller or deeper metals.
IMPORTANT! Ensure that tracking is off during air tests. Otherwise, the device will attempt
to perform ground balance on the target and the depth will be reduced.
Ground Balance Value
Ground balance value provides information about the ground you are searching on. Some
typical ground types are as follows:
0-25 Wet salt water or wet alkali soils
25-50 Wet salt water and wet alkali soils covered with dry layers
50-70 Regular, low-quality soils
70-90 Highly magnetic soils, magnetite or maghemite and similar highly mineralized soils,
black sand.
Important Details Concerning Ground Balance
1) Upon start up, the ground balance value is set to 90. The device can perform ground
balance automatically within the range of 20-90 in all modes and 00-90 in the COG mode.
2) If the ground mineralization is too low, automatic ground balance may fail to work in
other modes except for the COG mode. In such a case, you can auto ground balance in the
COG mode and then switch to other modes or try manual ground balancing.
3) You can test the accuracy of the ground balance with the pinpoint mode. After ground
balancing, if you receive no sound or a weak one when you move the search coil closer to
the ground in the pinpoint mode, then the ground balance is successful. If the sound gets
louder when you move the search coil closer to the ground, then the ground balance is not
successful. In this case, simply change your location. If ground balance is not possible despite
these efforts, you should continue your search without performing ground balance.
You cannot search in the General Search and Static modes without ground balancing. You need
to use one of the discrimination modes and increase the Disc. value until the noise is eliminated.
4) Once the ground balance is set, it will remain satisfactory for a long time in most areas.
However, if you encounter an excavated, backfilled or geologically composite soil structure,
a ground balance should be performed again to adapt to the varying soil structure. In
addition, re-ground balancing is recommended if you change the operating frequency of
the device (5kHz/14kHz/20kHz) in certain ground conditions.
5) When using the optional large coil, pump the coil more slowly and do not keep it very
close to the ground.
6) In some cases where the iSAT value is set high, the device may not be able to ground
balance automatically. In such a case, first lower the iSAT and after ground balancing switch
it back to its previous position.
TARGET ID is the number produced by the metal detector based on the conductivity of the
metals and gives an idea to the user about what the target may be. Target ID is shown with
two digits on the display and ranges between 00-99.
NOTE: Keep in mind, large targets will ID higher than expected, even though they may be
of lower conductance.
In some cases, the device may produce multiple IDs for the same target. In other words, the
IDs may be jumpy. This may result from several factors. Target orientation, depth, purity of
the metal, corrosion, mineralization level of the soil etc. Even the direction of the search coil
swing may cause the device to generate multiple IDs.
In some cases, the device may fail to provide any ID. The device needs to receive a strong and
a clear signal from the target in order to provide an ID. Therefore, it may not be able to provide
an ID for targets at fringe depths or smaller targets even if the device detects them.
Page 11
Keep in mind that target IDs are“probable”, in other words, estimated values and it would
not be possible to know the properties of a buried object exactly until it is dug out.
IDs of non-ferrous metals such as copper, silver, aluminum and lead are high. Target ID range
of gold is wide and may fall within the same range of metal wastes such as iron, foil, screw
caps, and pull tabs. Therefore, if you are looking for gold targets, digging out some trash
metals is expected.
IMPACT utilizes 2 different ID scales according to the search modes. In DI2, DI3, DI4, DI99 and
COG modes, the ferrous range is 00-15 at factory defaults. In GEN, GEN (D), STA, STA (D), DEEP,
VLX1 and VLX2 modes, the ferrous range is 00-40. In addition, when the operating frequency
is changed, the Target ID will change as well. This represents the ''Standard'' ID scaling of the
device.
IMPORTANT! At start up, IMPACT will utilize the ''Normalized'' ID scale and not the
Standard ID scale. In other words, the IDs will not change upon frequency change and
the device will generate the 14kHz IDs in each frequency. However, based on ground
conditions IDs may vary for certain metals.
If you prefer to see the different IDs produced by each frequency, you need use the
''Standard'' ID scale. To switch to the standard IDs, pull the trigger and push the (+) button
at the same time. Letters ''Sd'' will appear on the screen. If you wish to revert back to the
normalized IDs, repeat the same process and letters ''no'' will appear on the screen.
Tables outlining the search modes and ID ranges as well as the probable IDs for each
frequency are placed at the back of this manual. You can easily detach the pages and
carry them with you during your searches.
Coins searched throughout the world are made of different metals and in different sizes in
different geographical locations and historical eras. Therefore, in order to learn the Target
IDs of the coins in a specific region, it is suggested to perform a test with the samples of such
coins, if possible.
It may take some time and experience to make best use of the Target ID feature in your
search area. Different brands and models of detectors produce different target ID numbers.
The numbers vary even more depending on target depth, ground mineralization, and
adjacent metals. But after some practice, you will quickly become comfortable with the
meanings of the IMPACT's Target IDs.
Target ID Depth
This setting is not present in the menu.
Adjusts the depth level that the device displays an ID for a detected target. It consists of 3
levels: Hi (High), In (Intermediate), Lo (Low). Factory default is set to ''In''.
The lower the ID depth level is, the higher the ID accuracy and vice versa. At the high level,
the IDs may become jumpy.
To change the ID depth level, pull the trigger and press the up button simultaneously. Each
time you press the up button, the ID depth level will change.
TARGET ID
Page 12
SEARCH MODES
IMPACT has 12 search modes (2 static, 2 all metal and 8 discrimination) designed for different
terrains and targets. You can navigate between the modes easily by using the direction
buttons. The selected mode name will be framed on screen.
Tables outlining the search modes, recommended areas of usage and settings used in
each mode are placed at the back of this manual. You can easily detach the pages and
carry them with you during your searches.
Static Mode (STA)
This is a non-motion mode. In other words, the device will generate an audio response
when you hold the coil stationary without swinging over the target. The audio response
increases in volume as the coil approaches the target. This mode is recommended for larger
and deeper metals.
In the STA mode, the device will generate the same audio tone for all metals and it will
display the target ID on screen. At the same time, the ID scale will fill up to the right in
proportion to the signal strength.
Target ID range is 00-99. 00-40 are ferrous and 41-99 are non-ferrous metals. You can
discriminate out all IDs below a certain ID by using the Disc. setting and simply avoid
these metals in the field.
When the device detects a discriminated metal, it will not produce an audio response or an
ID. However, the ID scale will fill up to the right in proportion to the signal strength.
The threshold in this mode is internal and cannot be adjusted by the user. Changes in the
ground and temperature may lead to drifts in the threshold. Threshold drifts will be reflected
in the ID scale either in the positive way (right side) or the negative way (left side). The device
may emit an audible response in the positive drifts but not in the negative ones. When the
threshold drifts, pull the trigger once to retune the detector. Retuning periodically while
searching in this mode is recommended.
IMPORTANT! For a more stable operation, try keeping the coil consistently at the same
height above the ground where you retuned the detector.
IMPORTANT! If you retune the detector over a target, the threshold will drift to the negative
side and the device will no longer detect the target until the detector is retuned. In addition,
the depth of the detector will also decrease.
If the drifts are substantial and retuning does not improve the situation, increase the iSAT
setting in the Expert Settings to a level where the drifts are eliminated (for detailed informa-
tion on iSAT please refer to page 24). As the iSAT is increased, the device may detect weaker
signals but will not be able to detect the targets anymore if you hold the coil stationary or
sweep back and forth over the target. If the drifts still continue frequently, drop the gain to
39, decrease the iSAT and re-ground balance.
Static Delta Mode (STA (D))
In principle, it works the same as the static mode. The difference is that the static delta mode
will generate the same tone for ferrous and non-ferrous targets at fringe depths but it will
discriminate the shallow ferrous targets by emitting a low iron tone. Also, Disc. setting is not
available in this mode.
Please refer to Table 2 at the end of the manual for different settings used in STA and STA (D)
modes.
General Search (GEN)
Different than the other modes, this mode features a threshold tone which is continuously
heard in the background.
General Search (GEN) mode is used in 2 different ways in the IMPACT: 1) with the Disc. setting
disabled at 0 2) with Disc. enabled (non-zero). When the device is first turned on, Disc. setting
will be off. When the Disc. is set at 0, the device does not discriminate targets and detects
all targets (metals, mineralized rocks etc.). ID of the detected target is shown on the display
(except for negative hot rocks) and the same audio tone is provided for all targets. The audio
tone increases in pitch as the coil approaches the target. This is the typical All Metal mode
found in most detectors.
When using the Disc. Setting in this mode, the device will emit a low ferrous tone for all
targets below the Disc. Setting, and a higher tone for all targets above the Disc. setting
which changes in pitch as the coil approaches the target. Let's say you set the Disc. to 20.
The device will generate a low iron tone for all metals with 0-20 ID and a higher tone for
all targets with 21-99 ID. Upon target detection, the threshold will momentarily go silent
and only the target audio response will be heard. The duration of the threshold's silence is
directly related to the level of the iSAT.
Gain, threshold and iSAT settings in this mode are optimized to provide the best perfor-
mance on different terrains. You can modify these settings based on ground conditions.
We recommend using the GEN mode when discrimination is not important and not using
it in heavy trash areas or areas containing many hot rocks.
Audio Boost in the General Search Mode
This feature is not included in the settings on screen. Boosts the sound of weak signals
received from small or deep targets making it easier for you to detect those uncertain
targets. It is recommended that audio boost should be used on a temporary or as-needed
basis because it will not only boost the target signal audio but it will also boost the volume
of ground noise and false signals along with the threshold hum.
Audio Boost consists of 5 levels (b1-b5). At start up, the Audio Boost level is set to low (b1). To
increase the Audio Boost level, pull the trigger and press the minus (-) button simultaneously.
Audio Boost will only work in the GEN mode.
General Search Delta (GEN (D))
In principle, it works the same as GEN mode. The difference is that the Gen (D) mode will
generate the same tone for ferrous and non-ferrous targets at fringe depths but it will
discriminate the shallow ferrous targets by emitting a low iron tone.
Please refer to Table 2 at the end of the manual for different settings used in GEN and GEN
(D) modes.
2-Tone Discrimination (DI2)
Recommended especially for relic hunting. It produces good results particularly on clean
sites which do not contain waste metal. More depth can be obtained on sites which are
rocky or those that contain waste metals by using the Disc. and Notch Filter and swinging
the search coil more slowly (one right/left pass per approximately 1 second). Disc. is set to
03 as a default value. You can modify this value according to the ID of the targets you don’t
want to detect.
In this mode, the device produces a low tone for ferrous targets with IDs between 0-15.
For targets with IDs 16-99, it produces a higher tone which increases in pitch as the coil
approaches the target. By using the Tone Break feature, you can adjust the break points of
the target response tones on the Target ID range.
3-Tone Discrimination (DI3)
This is the 3-tone discrimination mode designed for coin hunting especially in trashy sites
such as parks. In this mode, the device produces a low tone for ferrous targets with 0-15 IDs, a
medium tone for gold and non-ferrous metals with IDs 16-66 and a high tone for non-ferrous
metals with IDs 67-99 such as silver, brass and copper. By using the Tone Break feature, you
can adjust the break points of the target response tones on the Target ID range.
4-Tone Discrimination (DI4)
4-tone discrimination mode designed for coin hunting in low-medium mineralization. Due
to its high gain and depth, this mode is a bit noisier than the other modes. Noise will be
more in the air versus in the ground. Take this fact into consideration when adjusting the
gain level.
In this mode, the device produces a low tone for ferrous targets with 0-15 IDs, a medium tone
for gold and non-ferrous metals with IDs 16-30, a medium-high tone for metals with 31-66
IDs, and a high tone for non-ferrous metals with IDs 67-99. By using the Tone Break feature,
you can adjust the break points of the target response tones on the Target ID range.
99-Tone Discrimination (DI99)
Multi-tone discrimination mode designed for coin hunting in various mineralization. In this
mode, the device produces a low tone for ferrous targets with 0-15 IDs. For targets with IDs
greater than 15, the device will produce a different tone for each ID. The tone will be higher
in pitch as the conductivity of the metal increases and vice versa.
Conductive Ground (COG)
This is a special mode of the IMPACT developed for conductive grounds (salty wet sand
beach, grounds with alkali soil etc.). The feature of this mode presents the ability to ignore
iron and similar targets in this group and to be able to perform ground balance on any type
of ground. While the device performs ground balance in the range of 20-90 automatically
in the other discrimination modes, the device ground balances in the range of 0-90 in this
mode. This enables easier ground balancing on conductive grounds where normally ground
balance cannot be performed at all or performed with difficulty.
In this mode, the device produces a low tone for ferrous targets with IDs between 0-15.
For targets with IDs 16-99, it produces a higher tone which increases in pitch as the coil
approaches the target. By using the Tone Break feature, you can adjust the break points of
the target response tones on the Target ID range.
Different than the other modes, the Disc. is set to 15 as a default value in this mode in order
to ignore ferrous metals or ground noise.
Salt water and alkali grounds are significantly conductive due to high ionization and cause
effects similar to that of iron in detectors. These effects may make it impossible to search
for metals with a standard detector. Existence of an iron elimination feature in a detector
can improve the situation but may not be sufficient.
IMPACT's COG mode eliminates such effects and ground noise. Aspects to be taken into
consideration while searching on conductive grounds are explained in more detail in the
section titled Searching in Shallow Water and Beach (page 29).
Deep Mode (DEEP)
Recommended especially for relic hunting, this mode is the deepest mode of the device.
Therefore, it may run relatively noisier. Noise will be more in the air versus in the ground. Take
this fact into consideration when adjusting the gain level. While searching in this mode, a
slower swing speed is required.
The discrimination ability of the DEEP mode is relatively less compared to the other modes.
Hence, its performance may vary on trashy sites versus clean ones.
In this mode, the device produces a low tone for ferrous targets with IDs between 0-40. For
gold and non-ferrous targets with IDs 41-99, it produces a higher tone which increases in
pitch as the coil approaches the target. By using the Tone Break feature, you can adjust the
break points of the target response tones on the Target ID range.
VLX1
3-tone discrimination mode designed for users who prefer a lower noise level while detecting.
Ideal for coin hunting on changing grounds and different levels of mineralization. It will
provide weaker responses for fringe depth targets as well as ground and environmental noises.
Therefore, it is suitable for use with Disc. set to 0 and at higher gain levels. If needed, a more
stable operation can be obtained by increasing the Disc. but Disc. will create a greater loss in
depth in this mode compared to others.
VLX2
Resembles the VLX1 in terms of characteristics. However, it is a deeper mode utilizing 4-tones
and it is ideal for both coin and relic hunting in changing ground conditions and all levels of
mineralization.
IMPACT has 12 search modes (2 static, 2 all metal and 8 discrimination) designed for different
terrains and targets. You can navigate between the modes easily by using the direction
buttons. The selected mode name will be framed on screen.
Tables outlining the search modes, recommended areas of usage and settings used in
each mode are placed at the back of this manual. You can easily detach the pages and
carry them with you during your searches.
Static Mode (STA)
This is a non-motion mode. In other words, the device will generate an audio response
when you hold the coil stationary without swinging over the target. The audio response
increases in volume as the coil approaches the target. This mode is recommended for larger
and deeper metals.
In the STA mode, the device will generate the same audio tone for all metals and it will
display the target ID on screen. At the same time, the ID scale will fill up to the right in
proportion to the signal strength.
Target ID range is 00-99. 00-40 are ferrous and 41-99 are non-ferrous metals. You can
discriminate out all IDs below a certain ID by using the Disc. setting and simply avoid
these metals in the field.
When the device detects a discriminated metal, it will not produce an audio response or an
ID. However, the ID scale will fill up to the right in proportion to the signal strength.
The threshold in this mode is internal and cannot be adjusted by the user. Changes in the
ground and temperature may lead to drifts in the threshold. Threshold drifts will be reflected
in the ID scale either in the positive way (right side) or the negative way (left side). The device
may emit an audible response in the positive drifts but not in the negative ones. When the
threshold drifts, pull the trigger once to retune the detector. Retuning periodically while
searching in this mode is recommended.
IMPORTANT! For a more stable operation, try keeping the coil consistently at the same
height above the ground where you retuned the detector.
IMPORTANT! If you retune the detector over a target, the threshold will drift to the negative
side and the device will no longer detect the target until the detector is retuned. In addition,
the depth of the detector will also decrease.
If the drifts are substantial and retuning does not improve the situation, increase the iSAT
setting in the Expert Settings to a level where the drifts are eliminated (for detailed informa-
tion on iSAT please refer to page 24). As the iSAT is increased, the device may detect weaker
signals but will not be able to detect the targets anymore if you hold the coil stationary or
sweep back and forth over the target. If the drifts still continue frequently, drop the gain to
39, decrease the iSAT and re-ground balance.
Static Delta Mode (STA (D))
In principle, it works the same as the static mode. The difference is that the static delta mode
Page 13
will generate the same tone for ferrous and non-ferrous targets at fringe depths but it will
discriminate the shallow ferrous targets by emitting a low iron tone. Also, Disc. setting is not
available in this mode.
Please refer to Table 2 at the end of the manual for different settings used in STA and STA (D)
modes.
General Search (GEN)
Different than the other modes, this mode features a threshold tone which is continuously
heard in the background.
General Search (GEN) mode is used in 2 different ways in the IMPACT: 1) with the Disc. setting
disabled at 0 2) with Disc. enabled (non-zero). When the device is first turned on, Disc. setting
will be off. When the Disc. is set at 0, the device does not discriminate targets and detects
all targets (metals, mineralized rocks etc.). ID of the detected target is shown on the display
(except for negative hot rocks) and the same audio tone is provided for all targets. The audio
tone increases in pitch as the coil approaches the target. This is the typical All Metal mode
found in most detectors.
When using the Disc. Setting in this mode, the device will emit a low ferrous tone for all
targets below the Disc. Setting, and a higher tone for all targets above the Disc. setting
which changes in pitch as the coil approaches the target. Let's say you set the Disc. to 20.
The device will generate a low iron tone for all metals with 0-20 ID and a higher tone for
all targets with 21-99 ID. Upon target detection, the threshold will momentarily go silent
and only the target audio response will be heard. The duration of the threshold's silence is
directly related to the level of the iSAT.
Gain, threshold and iSAT settings in this mode are optimized to provide the best perfor-
mance on different terrains. You can modify these settings based on ground conditions.
We recommend using the GEN mode when discrimination is not important and not using
it in heavy trash areas or areas containing many hot rocks.
Audio Boost in the General Search Mode
This feature is not included in the settings on screen. Boosts the sound of weak signals
received from small or deep targets making it easier for you to detect those uncertain
targets. It is recommended that audio boost should be used on a temporary or as-needed
basis because it will not only boost the target signal audio but it will also boost the volume
of ground noise and false signals along with the threshold hum.
Audio Boost consists of 5 levels (b1-b5). At start up, the Audio Boost level is set to low (b1). To
increase the Audio Boost level, pull the trigger and press the minus (-) button simultaneously.
Audio Boost will only work in the GEN mode.
General Search Delta (GEN (D))
In principle, it works the same as GEN mode. The difference is that the Gen (D) mode will
generate the same tone for ferrous and non-ferrous targets at fringe depths but it will
discriminate the shallow ferrous targets by emitting a low iron tone.
Please refer to Table 2 at the end of the manual for different settings used in GEN and GEN
(D) modes.
2-Tone Discrimination (DI2)
Recommended especially for relic hunting. It produces good results particularly on clean
sites which do not contain waste metal. More depth can be obtained on sites which are
rocky or those that contain waste metals by using the Disc. and Notch Filter and swinging
the search coil more slowly (one right/left pass per approximately 1 second). Disc. is set to
03 as a default value. You can modify this value according to the ID of the targets you don’t
want to detect.
In this mode, the device produces a low tone for ferrous targets with IDs between 0-15.
For targets with IDs 16-99, it produces a higher tone which increases in pitch as the coil
approaches the target. By using the Tone Break feature, you can adjust the break points of
the target response tones on the Target ID range.
3-Tone Discrimination (DI3)
This is the 3-tone discrimination mode designed for coin hunting especially in trashy sites
such as parks. In this mode, the device produces a low tone for ferrous targets with 0-15 IDs, a
medium tone for gold and non-ferrous metals with IDs 16-66 and a high tone for non-ferrous
metals with IDs 67-99 such as silver, brass and copper. By using the Tone Break feature, you
can adjust the break points of the target response tones on the Target ID range.
4-Tone Discrimination (DI4)
4-tone discrimination mode designed for coin hunting in low-medium mineralization. Due
to its high gain and depth, this mode is a bit noisier than the other modes. Noise will be
more in the air versus in the ground. Take this fact into consideration when adjusting the
gain level.
In this mode, the device produces a low tone for ferrous targets with 0-15 IDs, a medium tone
for gold and non-ferrous metals with IDs 16-30, a medium-high tone for metals with 31-66
IDs, and a high tone for non-ferrous metals with IDs 67-99. By using the Tone Break feature,
you can adjust the break points of the target response tones on the Target ID range.
99-Tone Discrimination (DI99)
Multi-tone discrimination mode designed for coin hunting in various mineralization. In this
mode, the device produces a low tone for ferrous targets with 0-15 IDs. For targets with IDs
greater than 15, the device will produce a different tone for each ID. The tone will be higher
in pitch as the conductivity of the metal increases and vice versa.
Conductive Ground (COG)
This is a special mode of the IMPACT developed for conductive grounds (salty wet sand
beach, grounds with alkali soil etc.). The feature of this mode presents the ability to ignore
iron and similar targets in this group and to be able to perform ground balance on any type
of ground. While the device performs ground balance in the range of 20-90 automatically
in the other discrimination modes, the device ground balances in the range of 0-90 in this
mode. This enables easier ground balancing on conductive grounds where normally ground
balance cannot be performed at all or performed with difficulty.
In this mode, the device produces a low tone for ferrous targets with IDs between 0-15.
For targets with IDs 16-99, it produces a higher tone which increases in pitch as the coil
approaches the target. By using the Tone Break feature, you can adjust the break points of
the target response tones on the Target ID range.
Different than the other modes, the Disc. is set to 15 as a default value in this mode in order
to ignore ferrous metals or ground noise.
Salt water and alkali grounds are significantly conductive due to high ionization and cause
effects similar to that of iron in detectors. These effects may make it impossible to search
for metals with a standard detector. Existence of an iron elimination feature in a detector
can improve the situation but may not be sufficient.
IMPACT's COG mode eliminates such effects and ground noise. Aspects to be taken into
consideration while searching on conductive grounds are explained in more detail in the
section titled Searching in Shallow Water and Beach (page 29).
Deep Mode (DEEP)
Recommended especially for relic hunting, this mode is the deepest mode of the device.
Therefore, it may run relatively noisier. Noise will be more in the air versus in the ground. Take
this fact into consideration when adjusting the gain level. While searching in this mode, a
slower swing speed is required.
The discrimination ability of the DEEP mode is relatively less compared to the other modes.
Hence, its performance may vary on trashy sites versus clean ones.
In this mode, the device produces a low tone for ferrous targets with IDs between 0-40. For
gold and non-ferrous targets with IDs 41-99, it produces a higher tone which increases in
pitch as the coil approaches the target. By using the Tone Break feature, you can adjust the
break points of the target response tones on the Target ID range.
VLX1
3-tone discrimination mode designed for users who prefer a lower noise level while detecting.
Ideal for coin hunting on changing grounds and different levels of mineralization. It will
provide weaker responses for fringe depth targets as well as ground and environmental noises.
Therefore, it is suitable for use with Disc. set to 0 and at higher gain levels. If needed, a more
stable operation can be obtained by increasing the Disc. but Disc. will create a greater loss in
depth in this mode compared to others.
VLX2
Resembles the VLX1 in terms of characteristics. However, it is a deeper mode utilizing 4-tones
and it is ideal for both coin and relic hunting in changing ground conditions and all levels of
mineralization.
SEARCH MODES
IMPACT has 12 search modes (2 static, 2 all metal and 8 discrimination) designed for different
terrains and targets. You can navigate between the modes easily by using the direction
buttons. The selected mode name will be framed on screen.
Tables outlining the search modes, recommended areas of usage and settings used in
each mode are placed at the back of this manual. You can easily detach the pages and
carry them with you during your searches.
Static Mode (STA)
This is a non-motion mode. In other words, the device will generate an audio response
when you hold the coil stationary without swinging over the target. The audio response
increases in volume as the coil approaches the target. This mode is recommended for larger
and deeper metals.
In the STA mode, the device will generate the same audio tone for all metals and it will
display the target ID on screen. At the same time, the ID scale will fill up to the right in
proportion to the signal strength.
Target ID range is 00-99. 00-40 are ferrous and 41-99 are non-ferrous metals. You can
discriminate out all IDs below a certain ID by using the Disc. setting and simply avoid
these metals in the field.
When the device detects a discriminated metal, it will not produce an audio response or an
ID. However, the ID scale will fill up to the right in proportion to the signal strength.
The threshold in this mode is internal and cannot be adjusted by the user. Changes in the
ground and temperature may lead to drifts in the threshold. Threshold drifts will be reflected
in the ID scale either in the positive way (right side) or the negative way (left side). The device
may emit an audible response in the positive drifts but not in the negative ones. When the
threshold drifts, pull the trigger once to retune the detector. Retuning periodically while
searching in this mode is recommended.
IMPORTANT! For a more stable operation, try keeping the coil consistently at the same
height above the ground where you retuned the detector.
IMPORTANT! If you retune the detector over a target, the threshold will drift to the negative
side and the device will no longer detect the target until the detector is retuned. In addition,
the depth of the detector will also decrease.
If the drifts are substantial and retuning does not improve the situation, increase the iSAT
setting in the Expert Settings to a level where the drifts are eliminated (for detailed informa-
tion on iSAT please refer to page 24). As the iSAT is increased, the device may detect weaker
signals but will not be able to detect the targets anymore if you hold the coil stationary or
sweep back and forth over the target. If the drifts still continue frequently, drop the gain to
39, decrease the iSAT and re-ground balance.
Static Delta Mode (STA (D))
In principle, it works the same as the static mode. The difference is that the static delta mode
will generate the same tone for ferrous and non-ferrous targets at fringe depths but it will
discriminate the shallow ferrous targets by emitting a low iron tone. Also, Disc. setting is not
available in this mode.
Please refer to Table 2 at the end of the manual for different settings used in STA and STA (D)
modes.
General Search (GEN)
Different than the other modes, this mode features a threshold tone which is continuously
heard in the background.
General Search (GEN) mode is used in 2 different ways in the IMPACT: 1) with the Disc. setting
disabled at 0 2) with Disc. enabled (non-zero). When the device is first turned on, Disc. setting
will be off. When the Disc. is set at 0, the device does not discriminate targets and detects
all targets (metals, mineralized rocks etc.). ID of the detected target is shown on the display
(except for negative hot rocks) and the same audio tone is provided for all targets. The audio
tone increases in pitch as the coil approaches the target. This is the typical All Metal mode
found in most detectors.
When using the Disc. Setting in this mode, the device will emit a low ferrous tone for all
targets below the Disc. Setting, and a higher tone for all targets above the Disc. setting
which changes in pitch as the coil approaches the target. Let's say you set the Disc. to 20.
The device will generate a low iron tone for all metals with 0-20 ID and a higher tone for
all targets with 21-99 ID. Upon target detection, the threshold will momentarily go silent
and only the target audio response will be heard. The duration of the threshold's silence is
directly related to the level of the iSAT.
Gain, threshold and iSAT settings in this mode are optimized to provide the best perfor-
mance on different terrains. You can modify these settings based on ground conditions.
We recommend using the GEN mode when discrimination is not important and not using
it in heavy trash areas or areas containing many hot rocks.
Audio Boost in the General Search Mode
This feature is not included in the settings on screen. Boosts the sound of weak signals
received from small or deep targets making it easier for you to detect those uncertain
targets. It is recommended that audio boost should be used on a temporary or as-needed
basis because it will not only boost the target signal audio but it will also boost the volume
of ground noise and false signals along with the threshold hum.
Audio Boost consists of 5 levels (b1-b5). At start up, the Audio Boost level is set to low (b1). To
increase the Audio Boost level, pull the trigger and press the minus (-) button simultaneously.
Audio Boost will only work in the GEN mode.
General Search Delta (GEN (D))
In principle, it works the same as GEN mode. The difference is that the Gen (D) mode will
generate the same tone for ferrous and non-ferrous targets at fringe depths but it will
discriminate the shallow ferrous targets by emitting a low iron tone.
Page 14
Please refer to Table 2 at the end of the manual for different settings used in GEN and GEN
(D) modes.
2-Tone Discrimination (DI2)
Recommended especially for relic hunting. It produces good results particularly on clean
sites which do not contain waste metal. More depth can be obtained on sites which are
rocky or those that contain waste metals by using the Disc. and Notch Filter and swinging
the search coil more slowly (one right/left pass per approximately 1 second). Disc. is set to
03 as a default value. You can modify this value according to the ID of the targets you don’t
want to detect.
In this mode, the device produces a low tone for ferrous targets with IDs between 0-15.
For targets with IDs 16-99, it produces a higher tone which increases in pitch as the coil
approaches the target. By using the Tone Break feature, you can adjust the break points of
the target response tones on the Target ID range.
3-Tone Discrimination (DI3)
This is the 3-tone discrimination mode designed for coin hunting especially in trashy sites
such as parks. In this mode, the device produces a low tone for ferrous targets with 0-15 IDs, a
medium tone for gold and non-ferrous metals with IDs 16-66 and a high tone for non-ferrous
metals with IDs 67-99 such as silver, brass and copper. By using the Tone Break feature, you
can adjust the break points of the target response tones on the Target ID range.
4-Tone Discrimination (DI4)
4-tone discrimination mode designed for coin hunting in low-medium mineralization. Due
to its high gain and depth, this mode is a bit noisier than the other modes. Noise will be
more in the air versus in the ground. Take this fact into consideration when adjusting the
gain level.
In this mode, the device produces a low tone for ferrous targets with 0-15 IDs, a medium tone
for gold and non-ferrous metals with IDs 16-30, a medium-high tone for metals with 31-66
IDs, and a high tone for non-ferrous metals with IDs 67-99. By using the Tone Break feature,
you can adjust the break points of the target response tones on the Target ID range.
99-Tone Discrimination (DI99)
Multi-tone discrimination mode designed for coin hunting in various mineralization. In this
mode, the device produces a low tone for ferrous targets with 0-15 IDs. For targets with IDs
greater than 15, the device will produce a different tone for each ID. The tone will be higher
in pitch as the conductivity of the metal increases and vice versa.
Conductive Ground (COG)
This is a special mode of the IMPACT developed for conductive grounds (salty wet sand
beach, grounds with alkali soil etc.). The feature of this mode presents the ability to ignore
iron and similar targets in this group and to be able to perform ground balance on any type
of ground. While the device performs ground balance in the range of 20-90 automatically
in the other discrimination modes, the device ground balances in the range of 0-90 in this
mode. This enables easier ground balancing on conductive grounds where normally ground
balance cannot be performed at all or performed with difficulty.
In this mode, the device produces a low tone for ferrous targets with IDs between 0-15.
For targets with IDs 16-99, it produces a higher tone which increases in pitch as the coil
approaches the target. By using the Tone Break feature, you can adjust the break points of
the target response tones on the Target ID range.
Different than the other modes, the Disc. is set to 15 as a default value in this mode in order
to ignore ferrous metals or ground noise.
Salt water and alkali grounds are significantly conductive due to high ionization and cause
effects similar to that of iron in detectors. These effects may make it impossible to search
for metals with a standard detector. Existence of an iron elimination feature in a detector
can improve the situation but may not be sufficient.
IMPACT's COG mode eliminates such effects and ground noise. Aspects to be taken into
consideration while searching on conductive grounds are explained in more detail in the
section titled Searching in Shallow Water and Beach (page 29).
Deep Mode (DEEP)
Recommended especially for relic hunting, this mode is the deepest mode of the device.
Therefore, it may run relatively noisier. Noise will be more in the air versus in the ground. Take
this fact into consideration when adjusting the gain level. While searching in this mode, a
slower swing speed is required.
The discrimination ability of the DEEP mode is relatively less compared to the other modes.
Hence, its performance may vary on trashy sites versus clean ones.
In this mode, the device produces a low tone for ferrous targets with IDs between 0-40. For
gold and non-ferrous targets with IDs 41-99, it produces a higher tone which increases in
pitch as the coil approaches the target. By using the Tone Break feature, you can adjust the
break points of the target response tones on the Target ID range.
VLX1
3-tone discrimination mode designed for users who prefer a lower noise level while detecting.
Ideal for coin hunting on changing grounds and different levels of mineralization. It will
provide weaker responses for fringe depth targets as well as ground and environmental noises.
Therefore, it is suitable for use with Disc. set to 0 and at higher gain levels. If needed, a more
stable operation can be obtained by increasing the Disc. but Disc. will create a greater loss in
depth in this mode compared to others.
VLX2
Resembles the VLX1 in terms of characteristics. However, it is a deeper mode utilizing 4-tones
and it is ideal for both coin and relic hunting in changing ground conditions and all levels of
mineralization.
SEARCH MODES
IMPACT has 12 search modes (2 static, 2 all metal and 8 discrimination) designed for different
terrains and targets. You can navigate between the modes easily by using the direction
buttons. The selected mode name will be framed on screen.
Tables outlining the search modes, recommended areas of usage and settings used in
each mode are placed at the back of this manual. You can easily detach the pages and
carry them with you during your searches.
Static Mode (STA)
This is a non-motion mode. In other words, the device will generate an audio response
when you hold the coil stationary without swinging over the target. The audio response
increases in volume as the coil approaches the target. This mode is recommended for larger
and deeper metals.
In the STA mode, the device will generate the same audio tone for all metals and it will
display the target ID on screen. At the same time, the ID scale will fill up to the right in
proportion to the signal strength.
Target ID range is 00-99. 00-40 are ferrous and 41-99 are non-ferrous metals. You can
discriminate out all IDs below a certain ID by using the Disc. setting and simply avoid
these metals in the field.
When the device detects a discriminated metal, it will not produce an audio response or an
ID. However, the ID scale will fill up to the right in proportion to the signal strength.
The threshold in this mode is internal and cannot be adjusted by the user. Changes in the
ground and temperature may lead to drifts in the threshold. Threshold drifts will be reflected
in the ID scale either in the positive way (right side) or the negative way (left side). The device
may emit an audible response in the positive drifts but not in the negative ones. When the
threshold drifts, pull the trigger once to retune the detector. Retuning periodically while
searching in this mode is recommended.
IMPORTANT! For a more stable operation, try keeping the coil consistently at the same
height above the ground where you retuned the detector.
IMPORTANT! If you retune the detector over a target, the threshold will drift to the negative
side and the device will no longer detect the target until the detector is retuned. In addition,
the depth of the detector will also decrease.
If the drifts are substantial and retuning does not improve the situation, increase the iSAT
setting in the Expert Settings to a level where the drifts are eliminated (for detailed informa-
tion on iSAT please refer to page 24). As the iSAT is increased, the device may detect weaker
signals but will not be able to detect the targets anymore if you hold the coil stationary or
sweep back and forth over the target. If the drifts still continue frequently, drop the gain to
39, decrease the iSAT and re-ground balance.
Static Delta Mode (STA (D))
In principle, it works the same as the static mode. The difference is that the static delta mode
will generate the same tone for ferrous and non-ferrous targets at fringe depths but it will
discriminate the shallow ferrous targets by emitting a low iron tone. Also, Disc. setting is not
available in this mode.
Please refer to Table 2 at the end of the manual for different settings used in STA and STA (D)
modes.
General Search (GEN)
Different than the other modes, this mode features a threshold tone which is continuously
heard in the background.
General Search (GEN) mode is used in 2 different ways in the IMPACT: 1) with the Disc. setting
disabled at 0 2) with Disc. enabled (non-zero). When the device is first turned on, Disc. setting
will be off. When the Disc. is set at 0, the device does not discriminate targets and detects
all targets (metals, mineralized rocks etc.). ID of the detected target is shown on the display
(except for negative hot rocks) and the same audio tone is provided for all targets. The audio
tone increases in pitch as the coil approaches the target. This is the typical All Metal mode
found in most detectors.
When using the Disc. Setting in this mode, the device will emit a low ferrous tone for all
targets below the Disc. Setting, and a higher tone for all targets above the Disc. setting
which changes in pitch as the coil approaches the target. Let's say you set the Disc. to 20.
The device will generate a low iron tone for all metals with 0-20 ID and a higher tone for
all targets with 21-99 ID. Upon target detection, the threshold will momentarily go silent
and only the target audio response will be heard. The duration of the threshold's silence is
directly related to the level of the iSAT.
Gain, threshold and iSAT settings in this mode are optimized to provide the best perfor-
mance on different terrains. You can modify these settings based on ground conditions.
We recommend using the GEN mode when discrimination is not important and not using
it in heavy trash areas or areas containing many hot rocks.
Audio Boost in the General Search Mode
This feature is not included in the settings on screen. Boosts the sound of weak signals
received from small or deep targets making it easier for you to detect those uncertain
targets. It is recommended that audio boost should be used on a temporary or as-needed
basis because it will not only boost the target signal audio but it will also boost the volume
of ground noise and false signals along with the threshold hum.
Audio Boost consists of 5 levels (b1-b5). At start up, the Audio Boost level is set to low (b1). To
increase the Audio Boost level, pull the trigger and press the minus (-) button simultaneously.
Audio Boost will only work in the GEN mode.
General Search Delta (GEN (D))
In principle, it works the same as GEN mode. The difference is that the Gen (D) mode will
generate the same tone for ferrous and non-ferrous targets at fringe depths but it will
discriminate the shallow ferrous targets by emitting a low iron tone.
Please refer to Table 2 at the end of the manual for different settings used in GEN and GEN
(D) modes.
2-Tone Discrimination (DI2)
Recommended especially for relic hunting. It produces good results particularly on clean
sites which do not contain waste metal. More depth can be obtained on sites which are
rocky or those that contain waste metals by using the Disc. and Notch Filter and swinging
the search coil more slowly (one right/left pass per approximately 1 second). Disc. is set to
03 as a default value. You can modify this value according to the ID of the targets you don’t
want to detect.
In this mode, the device produces a low tone for ferrous targets with IDs between 0-15.
For targets with IDs 16-99, it produces a higher tone which increases in pitch as the coil
approaches the target. By using the Tone Break feature, you can adjust the break points of
the target response tones on the Target ID range.
3-Tone Discrimination (DI3)
This is the 3-tone discrimination mode designed for coin hunting especially in trashy sites
such as parks. In this mode, the device produces a low tone for ferrous targets with 0-15 IDs, a
medium tone for gold and non-ferrous metals with IDs 16-66 and a high tone for non-ferrous
metals with IDs 67-99 such as silver, brass and copper. By using the Tone Break feature, you
can adjust the break points of the target response tones on the Target ID range.
4-Tone Discrimination (DI4)
4-tone discrimination mode designed for coin hunting in low-medium mineralization. Due
to its high gain and depth, this mode is a bit noisier than the other modes. Noise will be
more in the air versus in the ground. Take this fact into consideration when adjusting the
gain level.
In this mode, the device produces a low tone for ferrous targets with 0-15 IDs, a medium tone
for gold and non-ferrous metals with IDs 16-30, a medium-high tone for metals with 31-66
IDs, and a high tone for non-ferrous metals with IDs 67-99. By using the Tone Break feature,
you can adjust the break points of the target response tones on the Target ID range.
99-Tone Discrimination (DI99)
Multi-tone discrimination mode designed for coin hunting in various mineralization. In this
mode, the device produces a low tone for ferrous targets with 0-15 IDs. For targets with IDs
greater than 15, the device will produce a different tone for each ID. The tone will be higher
in pitch as the conductivity of the metal increases and vice versa.
Conductive Ground (COG)
This is a special mode of the IMPACT developed for conductive grounds (salty wet sand
beach, grounds with alkali soil etc.). The feature of this mode presents the ability to ignore
iron and similar targets in this group and to be able to perform ground balance on any type
of ground. While the device performs ground balance in the range of 20-90 automatically
in the other discrimination modes, the device ground balances in the range of 0-90 in this
mode. This enables easier ground balancing on conductive grounds where normally ground
Page 15
balance cannot be performed at all or performed with difficulty.
In this mode, the device produces a low tone for ferrous targets with IDs between 0-15.
For targets with IDs 16-99, it produces a higher tone which increases in pitch as the coil
approaches the target. By using the Tone Break feature, you can adjust the break points of
the target response tones on the Target ID range.
Different than the other modes, the Disc. is set to 15 as a default value in this mode in order
to ignore ferrous metals or ground noise.
Salt water and alkali grounds are significantly conductive due to high ionization and cause
effects similar to that of iron in detectors. These effects may make it impossible to search
for metals with a standard detector. Existence of an iron elimination feature in a detector
can improve the situation but may not be sufficient.
IMPACT's COG mode eliminates such effects and ground noise. Aspects to be taken into
consideration while searching on conductive grounds are explained in more detail in the
section titled Searching in Shallow Water and Beach (page 29).
Deep Mode (DEEP)
Recommended especially for relic hunting, this mode is the deepest mode of the device.
Therefore, it may run relatively noisier. Noise will be more in the air versus in the ground. Take
this fact into consideration when adjusting the gain level. While searching in this mode, a
slower swing speed is required.
The discrimination ability of the DEEP mode is relatively less compared to the other modes.
Hence, its performance may vary on trashy sites versus clean ones.
In this mode, the device produces a low tone for ferrous targets with IDs between 0-40. For
gold and non-ferrous targets with IDs 41-99, it produces a higher tone which increases in
pitch as the coil approaches the target. By using the Tone Break feature, you can adjust the
break points of the target response tones on the Target ID range.
VLX1
3-tone discrimination mode designed for users who prefer a lower noise level while detecting.
Ideal for coin hunting on changing grounds and different levels of mineralization. It will
provide weaker responses for fringe depth targets as well as ground and environmental noises.
Therefore, it is suitable for use with Disc. set to 0 and at higher gain levels. If needed, a more
stable operation can be obtained by increasing the Disc. but Disc. will create a greater loss in
depth in this mode compared to others.
VLX2
Resembles the VLX1 in terms of characteristics. However, it is a deeper mode utilizing 4-tones
and it is ideal for both coin and relic hunting in changing ground conditions and all levels of
mineralization.
SEARCH MODES
Page 16
SETTINGS
Tables outlining the settings and the modes they are associated with are placed at the
back of this manual. You can easily detach the pages and carry them with you during
your searches.
Basic Settings
Push the SELECT button to access the basic settings. You can navigate the basic settings
with the up and down buttons. The value of the selected setting will be displayed on screen.
You can change the value using the plus (+) and minus (-) buttons. If the up/down and +/-
buttons are held down, the options and values will change rapidly.
To exit the settings, press the SELECT button or pull the trigger once. Settings will time out
in approximately 8 seconds and the device will revert back to the modes window.
Expert Settings
Push the EXPERT button to access the expert settings. You can navigate the expert settings
with the up and down buttons. The value of the selected setting will be displayed on screen.
You can change the value using the plus (+) and minus (-) buttons. If the up/down and +/-
buttons are held down, the options and values will change rapidly.
To exit the settings, press the EXPERT button or pull the trigger once. Settings will time out
in approximately 8 seconds and the device will revert back to the modes window.
NOTE: You can go from basic settings to expert settings directly simply by pressing the
EXPERT button. However, you cannot go from expert settings back to basic settings directly.
You will need to go back to the modes window first and then push the SELECT button.
NOTE: Certain settings are mode specific and thus cannot be selected in other modes. For
details, please review Table 3.
BASIC SETTINGS
false signals. Gain setting is a personal preference. However, It is important to set the gain set-
ting to the highest level possible where no major popping sounds are heard to avoid missing
smaller and deeper targets. For example; if the noise level is suitable for searching and is the
same at gain levels 40 and 70, then 70 should be preferred. Using the factory default levels
will be a good starting point until you get familiar and experienced with the device.
Gain in Discrimination Modes:
Since the threshold setting is not available in the discrimination modes, you can increase
the depth of the device or ensure noise-free operation on different grounds only by using
the gain setting.
In order to adjust the gain in the discrimination modes, first ground balance while the gain
is at its default setting. After ground balance is completed, hold the search coil stationary
or swing over the ground at search height. Reduce the gain if the device receives noise. If
not (ensure that the Disc. is also at its default settings when checking this), increase the
gain gradually until there is no popping sound. If the device starts to receive noise during
searching, reduce the gain gradually.
NOTE: IMPACT is a high gain device and some of the search modes will run relatively noisy
(Deep, DI4, VLX2) compared to other modes so as to provide the best depth performance.
However, due to the design characteristics of these modes, the noise will be heard more if
the coil is in free air than sweeping the coil on the ground. Please keep this factor in mind
while adjusting the gain.
Gain in Static Modes:
The factory default for the gain setting is optimized. In situations where you would like to
adjust the gain setting (sudden changes in weather conditions, different ground structures
and environmental noise), first re-ground balance. If there are significant positive or negative
threshold drifts after ground balancing, increase the iSAT setting in the Expert Settings. If the
drifts still continue frequently, drop the gain to 39, decrease the iSAT and re-ground balance.
In situations where the environmental and ground conditions allow, you can obtain more
depth by increasing the gain and lowering the iSAT.
Threshold (Thresh.)
In the General Search Modes (GEN and GEN (D)), search is performed with a continuous
humming sound in the background, also referred to as the threshold sound. The loudness
of this hum directly impacts the detection depth of smaller and deeper targets and it is
adjusted by the threshold (Thresh.) setting. If the threshold is set too high, a weak target
signal may not be heard. On the contrary, if the threshold is too low, you give up the depth
advantage this setting offers. In other words, weak signals of smaller or deeper targets may
be missed. It is recommended for average users to leave this setting at its default value
and for experienced users to adjust to the highest level where they can still hear the weak
target signals.
Threshold level is directly related to the Gain and iSAT settings. Please be sure to read the
related sections of the manual carefully.
GAIN
Gain is the depth setting of the device. It is also used to eliminate the ambient electromag-
netic signals from the surrounding environment and noise signals transmitted from ground.
NOTE: To obtain maximum depth performance, to eliminate the noise caused by electro-
magnetic interference, try shifting the frequency first (F. Shift). If this is not sufficient, change
the operating frequency of the device (5kHz/14kHz/20kHz) before lowering the gain.
Gain setting range is 01-99 and pre-defined for each mode. All modes start at default
settings. They can be manually modified when necessary. Gain adjustment applies to the
selected mode; the modified setting does not affect the gain setting of the other modes.
NOTE: If the ground is highly mineralized causing the device to overload, decrease the gain
until the ''Overload'' message disappears from the screen.
Gain in General Search Modes (GEN and GEN (D))
In the GEN modes, gain setting causes an increase or decrease in the popping sounds and
Discrimination (Disc.)
Disc. is the ability of the device to ignore all metals below a certain Target ID. In the Disc.
process, the filtered ID range is shown with lines on the ID scale and every 2 consecutive
IDs are represented with 1 line. For example, if you set the Disc. to 30, 15 lines will be shown
between the 0-30 ID range on the scale and the device will not produce an audio response
for any metals with IDs between 0-30.
Disc. setting is disabled for GEN (D) and STA (D) modes only. For all other modes, the factory
default value will be displayed on screen at start up.
In order to change the Disc. value, select the Disc. option from the menu and decrease or
increase the value using the plus (+) or minus (-) buttons. Please remember that certain
targets, other than the ones you want to ignore, may also be missed or their signals may
become weaker when using the Disc. setting.
In the case of receiving multiple IDs for the same target - let's say 35 and 55 - due to the orien-
tation of the target or the composition of the metal itself, if you set the Disc. to 40, because 35
will fall in the filtered range, the signal strength as well as the depth may diminish.
NOTE: Disc. setting works inversely proportional to depth up to level 15 in DI2, DI3, DI4,
DI99 and COG modes and up to 49 in GEN, GEN (D), STA, STA (D), DEEP, VLX1 and VLX2
modes. In other words, as the Disc. is increased up to the above mentioned levels, stabil-
ity will increase but depth will be reduced and vice versa. Above these levels though,
both depth and noise will increase.
Iron Volume (Fe Vol.)
It adjusts or turns off the volume of the low iron tone. It can be adjusted between F0-F5 or
n1-n5.
F0-F5: F5 is the maximum level. As you lower it, the audio response volume the device
produces for ferrous metals will decrease. At F0 level, the iron audio will be silenced. In
other words, the device will detect ferrous targets, the Target ID will be displayed on the
screen but the device will not produce any audio response.
n1-n5: This will enable you to get a low iron tone for your notched out target IDs instead
of silencing them. n5 is the maximum level and the iron volume will be reduced as you go
down but it cannot be silenced completely.
Fe Vol. adjustment applies to the selected search mode only. The change does not affect the
other modes.
Tracking
When tracking is active (01 position), the device continuously tracks the changing ground
structures and automatically reconfigures the ground balance setting. The invisible changes
in ground affect the detection depth as well as the discrimination ability of the device so
it is possible to operate the device at higher performance using this feature under suitable
ground conditions. Please refer to page 9 for more information on Tracking.
When tracking is activated, ''Track'' will be displayed in the message section at the bottom
of the screen.
NOTE: Tracking is recommended to be used in the GEN and GEN (D) modes only.
Brightness (Bright.)
It enables you to adjust display backlight level according to your personal preference. It
ranges between 0-5 and C1-C5. At 0 level, the backlight is off. When set between 1-5, it lights
up only for a short period of time when a target is detected or while navigating the menu
and then it goes off. At C1-C5 levels, it will be continuously lit. The continuous operation of
the backlight will affect power consumption, which is not recommended.
The backlight setting is restored to the final saved setting when the device is turned off and
on again. This setting is common in all modes; change made in any mode also applies to the
other modes.
Vibration (Vibrate)
This feature provides feedback to the user by producing a vibration effect when a target is
detected. It can be used independently or together with the audio response. When audio
response is disabled, all feedbacks are provided to the user as vibration only during target
detection.
Vibration setting is adjusted within the range of 00-05. When it is switched to 0, vibration fea-
ture is completely disabled. If the vibration is at 01 level, the device provides long vibration
signals and at 05 it provides short vibration signals. The magnitude of the vibration effect can
vary according to the depth of the target and the swinging speed. This setting is common in
all search modes (except for STA and STA (D)); change made in any mode also applies to the
other modes. Vibration will not work in STA and STA (D) modes except when the device goes
into overload.
Vibration may not be felt in the General Search modes (GEN and GEN (D)) with weak signals;
it will be felt as the signal gets stronger. In other words, vibration does not start at the depth
where the audio tones are heard but at a lesser depth. Therefore, if you are detecting with
vibration only and audio tones are off, you can miss weaker and deeper signals.
Vibration speed is constant in the pinpoint mode and cannot be adjusted. Vibration is off
at 0 position. 01-05 values provide the same level of vibration in the pinpoint mode. When
vibration is used in the pinpoint mode, vibration speed increases as the target is approached
and it reaches the maximum level over the center of the target.
The vibration setting is restored to the final saved setting when the device is turned off and
on again. This setting is common in all modes; change made in any mode also applies to the
other modes.
Led Flashlight (Light)
It is the headlight used for lighting the area you are scanning while detecting at night or in
dark locations. LED flashlight does not operate when the device is off. It is recommended to
turn it on only when necessary since its operation consumes extra battery power.
Frequency Shift (F. Shift)
It is used to eliminate the electromagnetic interference that the device receives from another
detector which operates in the same frequency range nearby or from the surroundings. If
too much noise is received when the search coil is lifted in the air, this may be caused by the
local electromagnetic signals or excessive gain settings.
To eliminate the noise caused by electromagnetic interference, try shifting the frequency
first (F. Shift) before lowering the gain to obtain maximum depth performance . Frequency
shift consists of 5 steps. Default setting is 03 which is the central frequency.
IMPORTANT! Frequency shift may impair performance. Therefore, it is suggested that you do
not shift the frequency unless it is necessary. In cases where the interference cannot be elimi-
nated with the frequency shift, the operating frequency of the device ((5kHz/14kHz/20kHz)
in the Expert Setting may also be changed.
Factory Default /Save (FD/Save)
With the FD/Save feature of the IMPACT, you can save your settings or restore factory
defaults. Save function saves all settings except for the ground balance, tracking and light.
The device starts in the last mode where the save function was performed.
To save your settings, select FD/Save on screen. Two dashes (--) will be displayed on screen.
Push the right button. When ''SA'' is displayed, press the SELECT button once. You will see
lines rotating in the GB window on the right side. When the saving is completed, the lines
will stop rotating and the SA text will disappear.
To go back to factory defaults, select FD/Save on screen. Two dashes (--) will be displayed
on screen. Push the left button. When ''Fd'' is displayed, press the SELECT button once. You
will see lines rotating in the GB window on the right side. When the process is completed,
the lines will stop rotating and the Fd text will disappear.
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