MDETECTORS.COM

TWINS
[gtwins]

~~921.60EUR~~ 749.06EUR

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- User's Guide.

Electronics of metal detectors use different principles, some of them have proved in practice to be more successful and reliable than others. Unquestionably, the most popular, the most effective and affordable metal detectors function on the principles of induction balance and pulse induction. This makes the problem of ground neutralization crucial. On “heavy” soils and when the induction balance detectors cannot be used, the pulse induction detectors become preferable. Their very low frequency makes them efficient even on highly mineralized and salty ground. This explains why almost all well-known manufacturers have pulse induction models. With this type of detectors, the search coil is not part of the resonance circuit, but a self-contained generator starts the pulse signal. The parameter to be analyzed is the transition time /the position of the pulse front/.

Pulse induction detectors are very efficient at profound search as they allow scanning with large square heads /frames/ of size from 1m x 1m to 2m x 2m and even larger. At the same time, the main disadvantage of this technology is its low capability to distinguish ferrous from non-ferrous metals. This narrows otherwise the entire hegemony of pulse induction detectors. The experience with these teaches that they alone are difficult to use, especially when they are equipped with large loops or frames. Pinpointing of small metal objects is hard and their identification unreliable. The two technologies advantages and disadvantages complement one another and they are almost always used together especially when a pulse induction detector with a large search frame is needed. First you scan with the induction balance detector to eliminate tiny and near the surface objects and then the pulse induction detector with its deep search frame will identify bigger objects deeper in the ground. Moreover, very deep small and large metal objects can be detected with ease. The only thing that has to be done is to switch between the two technologies and change the search heads in turn.
GRIZZLY TWINS combines the two technologies and provides detection on any soil and up to 3 m in depth. GRIZZLY TWINS is compact, highly sensitive, stable and easy to use. The detector and its accessories come in a sturdy and convenient carry bag which makes its use and transportation simple and handy.
The induction balance detector has its control knobs and switches positioned in the left on the control panel, the right portion of which is for the pulse induction detector digital display and its control buttons.
The selection of the mode is done with a button in the middle of the panel. It is this button that provides you to use only the advantages of these metal detection technologies.

Basic Pack 1

Search head for PI 38 cm;

Search head for IB oval DD22x32 cm;

Camouflage rucksack;
Telescopic handle with a carbon bar;
Control unit;
Stereo headphones with adapter and independent left and right active volume control;
Charging unit: 220 and 12V for a car lighter;
Control unit case – made of high-quality waterproof and heat-resistant isolation material;

Optional: Search frame 1m x 1m. It can be ordered in addition to the basic pack or as a replace of the search head for PI 33cm or 38 cm – this pack is called:

Basic Pack 2

Search head for PI 1m x 1m; - IF YOU WANT TO ORDER THIS PACK 2 FOR THE SAME PRICE, PLEASE CLICK DOWN.

Search head for IB oval DD22x32 cm;

Test in extremely mineralized ground and rocks.

HOW TO WORK IN PULSE INDUCTION MODULE?

Grizzly Twins Digital PI was designed by a new technology in which the signal 'back integration' used with this type of instruments (Pulse Induction) was replaced by a contemporary analog-to-digital converter and a microprocessor.

The POWER switch is normally in middle position, the detector being turned off. Turn the switch to the left (towards IB) and there will be a slight click, which means that the instrument is working in IB mode. To disable the mode leave the switch in middle position and turn the POWER switch right (towards PI), you will hear a click that means the PI mode is enabled. To turn off simply leave the POWER switch in middle position.

Turn the POWER switch right (towards PI) and you will hear a quiet click, the instrument is now working in PI mode. To exit the mode, leave the POWER switch in middle position.

Control functions

The front panel has 4 buttons on it with the following functions:

On pressing one of these buttons you decrease or increase the silent threshold.

ZERO or reset. The button also confirms each change of a parameter in the menu.

This button is to enter the menu as well as to cancel an adjustment.

Information on the display:

The first line shows the strength of the signal.

The second line gives the following values.

Ò õõ V x xx.x V

T xx– Threshold – is the Threshold which can be directly adjusted by the left and right arrows without having to enter the menu.

V x - Volume

xx.x V – U batt – Shows the battery voltage

Menu

Press the MENU button to enter the menu and change the setting. Use the left and right arrows to move up and down within the menu items. To enter a submenu, press the ENTER/ZERO buttonå.

- Volume

- Light

- U min of batt

- Guard interval

- Ground adjust

- Volume raise

Description:

Volume – Sound from a minimum level of 0 to a maximum level of 7

Light – Backlight – By default the setting is ON, but this menu will allow you to turn it off.

U min of batt - The minimum voltage at which the instrument will alarm a weak battery. The minimum user's adjustment step is100 mV.

Guard interval – The coil settings

-auto – At each start of the instrument it will adjust to the installed search head automatically.

-last - In case you will not use a different search head and you will scan with the head the instrument has already been set to work with, you need not waste time and wait for the detector to adjust to it, at the next start the last settings will be applied.

-You can manually change the setting for the Ground interval from 2 to 80; this parameter can be used as an additional function to eliminate the signals from the ground if such are present and cannot be neutralized with the Ground adjust function.

If the instrument detects signals from the ground at setting of 20, for example, a lower number will cause unstable work and false signals but higher sensitivity at the same time. The greater this number is, the less sensitive but more stable the instrument will be. In cases when the ground signals cannot be eliminated by adjusting the three parameters of Ground adjust, this number has to be manually increased.

Ground adjust – This function has three software approaches to neutralize the ground at different scan modes.

-off(static) - Ground balance is turned off or this is also called static mode or 'if there is an object, there is a signal'.

-adaptive - Adaptive processing of the signal - 1^st dynamic mode.

* When holding the search head still above a target the signal dies away, the head must be in motion so that the detector produces a sound.

-fixing - fixed software Ground balance adjustment - 2^nd dynamic mode.

* This mode is a combination of the previous two modes with the search head being in motion all the time. Keep in mind that this mode is slower, i.e. if you reach out a coin towards the search head in adaptive mode, then take it away and back again, the instrument will detect the coin, while in fixing mode and especially when the search speed is higher, it is likely that the target does not produce a sound.

Volume raise

-1/32, 1/16/ 1/8, ¼, ½ , 1 – This parameter is used to slow down the increase of the sound level at the beginning of the scale. It improves the stable work of the scheme at lower threshold. This parameter is reciprocal to the instrument sensitivity. So it is the most sensitive at 1/32 and when the silent threshold is low, it ought to be closer to 1.

HOW TO WORK IN IB MODE

Use the POWER switch to turn on/off the instrument as well as to switch between the IB and PI mode. Normally the switch is in middle position, then, the instrument is off. Turn the POWER switch to the left (towards IB) and you will hear a low click, this means the detector is started in IB mode.

Control knobs

· Discrimination mode switch: The switch has two positions: 1 – Left position (GEB), in this mode the discrimination is off, i.e. the instrument detects all metals and produces a consistent sound; 2 - Right position (DISK), when the instrument discriminates the metals, .i.e. at detection of non-ferrous metal targets it gives out a consistent sound versus broken and inconsistent signals when detected ferrous objects.

· VOLUME knob: Use this control to increase or decrease the signal out of the speaker;

· TUNE knob (for adjustment of the critical signal). The TUNE knob controls the silent threshold. Turn the knob right and you will hear a slowly increasing signal, with the help of the knob set this signal very weak. This weak signal is called critical signal (silent threshold). The instrument is the most sensitive when it works at the signal threshold setting.

· DISK knob (to increase or decrease the discrimination level). It controls the instrument's level of discrimination the discrimination being higher at greater numbers at the DISK knob, namely the instrument will produce a consistent signal (Discrimination ON) when it detects purer non-ferrous metals and its sound will be broken and inconsistent when the detected object is iron.

· GEB knob (to control mineralized ground detection): Turn the knob left or right to neutralize the signals from the ground, i.e. this control allows to ground balance the instrument in IB mode.