Handleiding Nokta Impact (pagina 24 van 40) (Engels)

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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

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