F3 Operations Manual
24
b. STEP 2 Ground Balance
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). Refer to Figure 17.
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).
Release the Ground Balance button.
150mm
(6 in)
Beep
Beep
P0623-A
Figure 17: Ground Balance Procedure
NOTE
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.
If the Ground Balance OK tone is not heard within
20 seconds of starting the procedure, release the Ground Balance
button and repeat this procedure.
If there is metal in the ground under the coil whilst Ground
Balancing, the detector will not ground balance correctly. Move the
detector and repeat the Ground Balance over ground that is free of
any metallic objects.
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