Minelab F3 COMPACT Service Manual page 9

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If the ground balance button is not immediately released the F3 COMPACT will commence the
f. Ground Balance Test. This test confirms the F3 COMPACT is capable of ground balancing
against mineralised ground. In doing so, it confirms the correct operation of the ground balance
button, coil and associated circuitry.
If the local soil is sufficiently mineralised or different soil types are available this can be used for
the ground balance test. The ground balance test can be conducted using a ground balance test
piece which must be metal free and can be a rock or soil sample that is mineralised enough to
cause a detection tone on the detector. Floor tiles or fired clay brick can be used a ground
balance test piece. The test is conducted as follows:
Ensure hands and arms are free of metal objects (watches, rings etc) and that no other
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metal objects are near the coil.
Keep the detector stationary and away from ground or metal objects, press and hold the
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green Ground Balance button for five seconds then release the button.
This action will cause the F3 COMPACT to delete the previously stored ground balance condition.
Unless this is done the detector will remember its last ground balance condition regardless of the
Slowly move the ground balance test piece from approximately 15cm (6in) above the coil
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towards the centre of the coil and confirm that a detection tone is heard. This confirms
that the detector is detecting the mineralised content of the ground balance test piece.
Figure 5: Audio Reset
Ground Balance procedure.
unit being switched off or the batteries removed.
NOTE
NOTE
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F3 COMPACT Service Manual