Minelab GPX-4000 Service Manual download pdf (Page 20)

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Threshold

Adjusting the Background

Audio Level

Threshold is the constant audible background audio

tone or 'hum' produced by the detector.

The level of the Threshold should be set low, but still

audible and stable. Ideally it should be a smooth,

gentle hum.

Small targets or large deep targets may not produce

a distinct target signal, but may cause only a small

variation in the Threshold.

If the Threshold level is set too high or too low, these

very small variations may be missed.

Listening for a target signal with a high Threshold

would be like trying to hear a whisper within a

crowded noisy room. A high Threshold volume may

also be uncomfortable for your hearing.

If the Threshold is set too low, the target signal

needs to be loud enough to become audible,

therefore very soft target signals from small or very

deep targets may not be heard.

It is important to reset the Threshold level as

conditions change. For example, your ears may

adjust to the low levels of audio after an hour or so,

or the conditions may have become windy.

Threshold

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When the Threshold is

too high, a faint signal is

masked, and only the peak

of the loud signal is audible

above the Threshold.

With the Threshold set

correctly, both target

signals are easily heard.

A Threshold level that is too

low does not allow faint

target signals to be heard.

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Minelab GPX-4000 Service Manual Page 20

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