Minelab F3 Service Manual page 17

ground balance test piece away from the centre of the coil to a distance of 15cm
(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 green 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 15cm (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
Where the Ground Balance Test is conducted using local soil, Figure 7 illustrates the
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.
e. Earset Test.
conducted as follows:

Plug the earset into the detector as shown in Figure 8.
5 Fault Finding Procedures.
NOTE
procedure to be followed
Figure 7: Ground Balance.
NOTE
This test confirms the earset is operating correctly and is
Page 17
F3 Service Manual