Minelab GPX-4000 Service Manual download pdf (Page 34)

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Manual Tune allows you to select a particular

channel, or you may want to fine tune the detector

after performing an auto-tune. If detecting in a quiet

area with no interference, you may find that you can

select a channel at one end of the scale or the other.

Low numbers are lower frequency channels and

high numbers are higher frequency channels.

High frequency channels can give slightly more

sensitivity to smaller targets close to the surface.

Low frequency channels can give a little more depth

to larger targets, but the difference is only marginal.

1 Hold the coil vertical and 100mm (4") above the

ground, making sure there are no large targets or

obvious electrical interferences close by.

2 Access the Manual Tune screen via the menu.

3 Slowly increase or decrease the numbers, pausing

after each change to test the stability.

4 Listen to each channel in the range until you hear

the least noise.

Manual Tune

Reducing Electrical Interference

(Auto Tune, pg. 33)

As it takes a while to go through the full range of

band numbers, we recommend that you use the

Manual Tune for fine adjustments after performing

an Auto Tune.

If interference persists after tuning, try reducing the

Gain setting, but in high interference areas you may

need to use Cancel on the Coil/Rx switch.

If the setting control is turned quickly you will notice

noise caused by rapid movement through the

channels. This is normal and will not be present when

the control is turned slowly.

Range 0 to 255

Battery Test

Viewing the Battery Voltage

The Battery Volts screen allows you to view the

current voltage of the battery. This screen can be

viewed at any time.

When the battery is low, a series of alarm signal

pulses are given at 1 minute intervals.

Note: The Battery Volts screen will display for a short

time and then the menu will automatically return.

Shutdown

at 7.1V

014

Fully Charged at 8.4V

Low Battery Audio

Signal Warning at 7.3V

24681012 16

Time (Hours)

Voltage (Volts)

Lithium Ion batteries have the advantage of holding power through

most of the life of the charge before going into a rapid shutdown.

100mm

(4")

A slower Motion speed will

also reduce instability due

to interference. (pg. 66)

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Minelab GPX-4000 Service Manual Page 34

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