Minelab GPX5000 Instruction Manual download pdf (Page 35)

GPX 5000 Range

GPX 4800 Range

Factory Preset

GPX 5000 Range

GPX 4800 Range

Factory Preset

1–20

1–10

10 (GPX 5000), 5 (GPX 4800)

Stabilizer

1–20

Signal Peak

Adjusting the pitch variation of

target signals.

You are more likely to hear a target signal when both the

volume and the tone of the target signal change upon

detection rather than the volume alone.

A target signal on the GPX Series is normally a two-tone signal.

A target signal which first falls in pitch and then rises

is normally a deep target. A 'rise and fall' of the pitch

characterises a small target.

The Signal Peak control sets the level of variance between the

high and low pitch of the signal.

A high Signal Peak setting

will increase the pitch variation

of the target signal. However,

in highly mineralised ground

this high variance of signal

may make the detector

appear noisy.

Reduced Pitch Variance (Large Target)

Low

Pitch Variance

Increased Pitch Variance (Large Target)

Signal peak

Rising Tone

Falling Tone

Pitch Variance

Rising Tone

Falling Tone

High

Reduced Pitch Variance (Large Target)

Low

Pitch Variance

Increased Pitch Variance (Large Target)

Signal peak

Rising Tone

Falling Tone

Pitch Variance

Rising Tone

Falling Tone

High

A low Signal Peak setting will

decrease the pitch variation so

target signals will sound more

monotone.

Note: People who suffer high

frequency hearing loss may

prefer to use a Signal Peak

setting of 10 or less.

The Stabilizer function controls the point at which faint

variations in the Threshold begin to be heard. These faint

variations can either be ambient noise or faint target signals.

As you increase the Stabilizer control faint signals will

become louder but the noise level will also increase. This

may potentially hide a desirable target signal. The Stabilizer

allows you to mask faint variations, to provide a perfectly

stable Threshold, improving your ability to identify faint

target signals.

The Stabilizer is best left in the Factory Preset position

until the soil conditions are determined. Once the Rx Gain

level has been set for the local conditions, and other audio

settings have been selected, the Stabilizer can then be used

to fine tune the Threshold stability.

To find the optimal position of the Stabilizer ensure the coil

is being swept across the ground. One number below the

point at which the Threshold begins to chatter is generally

the best setting.

The effect of the Stabilizer could be seen as having a

similar effect to that of the Rx Gain control. However, the

Stabilizer affects the audio processing only and does not

change the Receive (Rx) signal, so it should be used as a

final stage fine tune.

After making any adjustment to the Stabilizer, if the ground

conditions change or you wish to change coils, you may

need to reset the Rx Gain. Before doing so, return the

Stabilizer to the Factory Preset setting. This will ensure

you select the most appropriate Rx Gain level to suit the

conditions and then you can fine tune the Stabilizer.

Note: Regardless of which Audio Type is selected, the optimal

setting of the Stabilizer is one number below the point where

the Threshold begins to chatter.

Tip: By turning the stabilizer

control close to minimum

(<3) the threshold will be

very stable, but you will

lose a lot of sensitivity to

smaller targets. This can be

a desirable feature in certain

scenarios, such as looking for

large nuggets in a high-trash

area, or using the GPX Series

to search for coins or treasure.

We recommend the best order

for setting these controls are:

1 Select an appropriate

Search Mode.

2 Select the desired

Audio Type.

3 Adjust Rx Gain until

the threshold starts to

break up.

4 Adjust Stabilizer to smooth

out the threshold.

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Minelab GPX5000 Instruction Manual Page 35

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