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.
Page 20
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.
BASIC SETTINGS
