F3Ci Service Manual
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7
Note
T
he coil should not be moved nor should metallic objects be brought near the coil during this
procedure.
• The noise cancelling procedure will commence with a single beep followed by 20
seconds of sharp triple beeps and finish with a four beep sequence.
• During the 20 seconds the F3Ci scans the environment searching for the source of
any electrical interference. Once detected, the detector will automatically select a
different operating frequency to eliminate or reduce the interference.
e. Gr
ound Balance Test. This test confirms the F3Ci 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. The ground balance test can be conducted over local soil if
sufficiently mineralised or a ground balance test piece can be used. A mineralised “hot” rock or a
ceramic floor tile or clay roof tile may be suitable for use as a ground balance test piece. The test
is conducted as follows:
• Ensure hands and arms are free of metallic objects (watches, rings etc) and that no
other metallic objects are near the coil.
• Keep the detector stationary and away from ground or metal objects, press and
release the ground balance button. Continue to hold the detector stationary until the
ground balance OK tone is heard.
Figure 4: Noise Cancel
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