Step 2 Ground Balance - Minelab F3 COMPACT Operation Manual

b. 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 (section 4.3.1).
c. 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 (section 4.3.2).

4.2.2 STEP 2 Ground Balance

Ensure this procedure is carried out on ground free of metal and hold
the coil about 150 mm (6 ins) above the ground.
a. Press down and hold the Ground Balance button. Slowly lower
the coil directly to the ground then lift the coil up again 150 mm
(6 ins). Refer to Figure 15.
b. Continue to slowly 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).
c. Release the Ground Balance button.
Figure 15: Ground Balance procedure
NOTES
Movement of the coil during the entire Ground Balance procedure
should be slow, continuous and smooth and each down and up
movement should take 3 to 4 seconds.
F3 COMPACT Operations Manual
Beep
Beep
150mm
(6 in)
23