Minelab GP 3500 User Manual download pdf (Page 17)

front controls

– continued

page 26

l 4 controls and operation – front l

GP 3500

page 26

Coil (Double-D/M/Cancel)

This control changes the sensitivity and search pattern of the coil to allow

the GP series of Double-D coils to become multi-versatile with different

characteristics to suit different environments. This is achieved by altering

the pattern of transmit (TX) and receive (RX) fields of the coil and how the

control box interprets the response. Selection of different positions of this

switch, changes the electromagnetic field of the coil, thus giving better

performance in certain environments.

•

Double-D has the coil operate in a conventional Double D search

pattern and can be used in most areas of medium to very high

mineralization, being the most able to cope with these conditions.

It is also excellent for pinpointing targets as the response is strongest

from the centre of the coil.

•

M (Mono) changes the way the coil transmits and receives its signal

and may be used in most locations of low to medium mineralization,

and for locating small nuggets with Soil switch set to Sensitive. Use of

Mono will often increase the sensitivity of the detector but may also be

a little more unstable in heavily mineralized ground. Pinpointing is not

centred in the middle of the coil, but to one side and may give a

complex signal when the target is very close to the coil.

•

Cancel changes the electromagnetic field of the coil so that it is

particularly stable in areas of electrical interference. This position

is ideal in areas where the operator wants to detect close to suburbia

or where the Tune function has difficulty selecting a quiet operational

frequency (e.g.: near power lines, phone towers or under poor

atmospheric conditions). Pinpoint in Cancel will again be to one side

of centre and signals may be complex if the target is close to the coil.

This setting will limit sensitivity to deep targets.

Figure 4.22

Coil switch

NOTE – Coils not specifically designed for the GP 3500 may behave erratically or be

ineffective in either M (Mono) or Cancel modes.

Minelab Monoloop coils can be used on the GP 3500 with excellent results and we recommend their

use in conjunction with the coil switch in the M (mono) mode. This allows the use of monoloop coils

in soils where prospectors previously had to revert to using Double D coils.

In extreme mineralization, particularly heavy ironstone concentrations, you may experience a loud

signal spike when attempting to ground balance or while searching. The signal is random and very

sharp and it is not characteristic of a normal target signal. To prevent it from occurring, keep your

coil a few centimetres from the ground, or opt to use in Double D mode.

IMPORTANT

You will need to re-ground balance every time you select a new position for the ‘Coil’ switch.

front controls

– continued

l 4 controls and operation – front l

page 27

GP 3500 GP 3500

www.minelab.com

page 27

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 29 30

Comments to this Manuals

No comments

Minelab GP 3500 User Manual Page 17

Comments to this Manuals

Related products and manuals for Measuring, testing & control Minelab GP 3500