F3 Operations Manual
28
4.3 Optional Procedure. If after Step ONE the Threshold
Tone is not low and steady, conduct one or both of the following:
a. Noise Cancel. If the Threshold Tone is noisy or uneven when
the coil is stationary, conduct Noise Cancel.
NOTE
The detector cannot be used for clearing operations during Noise
Cancel.
The coil should not be moved during this procedure nor should
metallic objects be brought near the coil during this procedure.
Holding the coil stationary and at least 600mm (24ins) above the
ground press and immediately release
the Noise Cancel button
(Black Button located behind the handle).
Figure 19: Noise cancel
Noise Cancel will commence with two single beeps followed by
45 seconds of sharp double beeps finishing with four single
beeps.
During the 45 seconds, the detector scans the environment
searching for the source of any electrical interference. Once
detected, the F3 will automatically select a different operating
frequency to eliminate or reduce the interference.
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