
F3 INSTRUCTOR NOTES
Minelab Countermine Division Safety Through Excellence
17
The F3 will emit a series of four rising tones over 12 seconds
(internal diagnostic checks occurring). At the completion of the
Start-Up Tones listen for the low volume Threshold Tone. This
slide includes embedded wav file to demonstrate applicable tones.
If the Threshold Tone is steady continue with STEP 2. If the
Threshold Tone is noisy or uneven when the coil is stationary,
perform a Noise Cancel.
If the Threshold Tone is steady but seems louder than normal
when the coil is away from the ground and metallic targets,
perform an Audio Reset.
Sixteen
Cont
o STEP 2 - Ground Balance (Use the mineralized rock to
demonstrate procedure)
Ensure that this procedure is carried out on ground free of metal
and hold the coil about 150mm (6 ins) above the ground.
Press down and hold the green Ground Balance button and slowly
lower the coil directly to the ground then lift the coil up again
150mm (6ins).
Continue to lower and raise the coil until the ‘Ground Balance OK’
tone is heard. (‘Ground Balance OK’ tone consists of a short high-
pitched double beep – embedded wav file on slide.)
Release the Ground Balance button.
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