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9.6. GROUND FINE potentiometer

The GROUND FINE potentiometer serves as a further fine (precise) setting of

the ground balance in a manual ground balance working mode, ie for a fine

and complete eliminate of the ground effect at work in a manual ground

balance working mode.

The GROUND FINE potentiometer is used in combination with GROUND

COARSE potentiometer.

The recommended level for GROUND FINE potentiometer is level "5". This

allows, if required, through it to be made easy adjustment of the ground

balance, by turning it on the left (levels from "4" to "-") or on the right (levels

from "6" to "+").

GROUND FINE potentiometer is used for adjustment of an already set at base level by GROUND

COARSE potentiometer, ground balance, in manual ground balance mode.

Additional information on the process of balancing in manual ground balance mode has in the

description of a GROUND COARSE potentiometer available above.

In practice, in a manual ground balance mode, the most commonly used settings are:

Setting for medium mineralized terrain in GAIN = MAX, GROUND MODE = MAN:

- For v2: GROUND FINE = "5", GROUND COARCE = "6";

- For v2i: GROUND FINE = "5", GROUND COARCE = "5";

- For v3: GROUND FINE = "5", GROUND COARCE = "4".

Setting for high mineralized terrain in GAIN = MAX, GROUND MODE = MAN:

- For v2: GROUND FINE = "5", GROUND COARCE = "8";

- For v2i: GROUND FINE = "5", GROUND COARCE = "7";

- For v3: GROUND FINE = "5", GROUND COARCE = "6".

In this mode (setting for high mineralized terrain) easily be rejected also very rotten (decomposed)

small iron plates, pieces of tin cans and other heavily corroded irons, and of course, objects and

soils with high content of iron and iron oxides.

9.7. THRESHOLD potentiometer

The THRESHOLD potentiometer serves to define the desired from the user

audio threshold and sensitivity of the metal detector.

It is adjusted at absence of metal objects around the search coil of the

metal detector and depends on the terrain.

The recommended levels for THRESHOLD potentiometer are from level "4" to

about level "6".

The best depth for finding metal objects is achieved, when the THRESHOLD

potentiometer is turned in a position, corresponding to a quiet zoom sound

made by the metal detector in working mode (issued torn sound, buzzing,

whiz).

Quiet zoom sound mode is suitable for experienced seekers. The beginners should work at lower

levels, i.e. with completely silent (quiet) metal detector.

When working in manual ground balance mode, is necessary the final audio threshold level to

be set only after the metal detector is balanced.

The maximal audio threshold corresponding to a stable metal detector condition depends on

the terrain’s characteristics, the metal detector balancing (in manual ground balance mode)

and the user search speed.

For soils containing large amounts of salts, in moist and wet soils, in clay soils, when searching

on the beach and searching in salt water, is recommended potentiometer THRESHOLD to be

set at lower levels (from "5" to "3").

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