Minelab F3 Manuale di Servizio Scaricare il pdf (Pagina 9)

F3 Field Service Manual

Page 9

● Slowly move the ground balance test piece from approximately 150mm (6ins) above

the centre of the coil towards the centre of the coil and confirm that a rise in

Threshold Tone occurs. This confirms that the F3 is detecting the mineralised

content of the ground balance test piece.

● Press down and hold the ground balance button whilst slowly

moving the ground

balance test piece from approximately 150mm (6ins) above the centre of the coil

towards the centre of the coil (and touching the coil). Then move the ground balance

test piece away from the centre of the coil to a distance of 150mm (6ins).

● Repeat this process until the ‘Ground Balance OK’ tone consisting of a short high-

pitched double beep occurs. This tone confirms the ground balance procedure has

been completed correctly.

● Release the ground balance button and confirm that a steady, low volume Threshold

Tone remains.

● Confirm the ground balance is correct by moving the ground balance test piece from

approximately 150mm (6ins) above the centre of the coil towards the centre of the

coil. If there is no alarm from the ground balance test piece, the ground balance

procedure is functional.

● If an alarm occurs, repeat the above procedure. If ground balance cannot be

achieved, refer to Section 4 for faultfinding procedures.

NOTE

Where the Ground Balance Test is conducted using local soil, Figure 6 illustrates the

procedure to be followed

Figure 6: Ground Balance

NOTE

Successful ground balancing occurs within 5 to 10 seconds. Where the ground balance test

piece or local ground conditions are not sufficiently mineralised, the ‘Ground Balance OK’

tones may take a longer time to occur.

f. Earset Test. This test test confirms the earset is operating correctly and is

conducted as follows:

● Plug the earset into the detector as shown in Figure 7.

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Minelab F3 Manuale di Servizio Pagina 9