Minelab F3 Operation Manual page 34

•
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 any electrical interference. Once detected, the F3
will automatically select a different operating frequency to
eliminate or reduce the interference.
b. Audio Reset. Whenever the Threshold Tone sounds louder
than normal perform the Audio Reset procedure as follows:
The detector cannot be used for clearing operations during the
Audio Reset procedure.
•
Audio Reset should be carried out whenever the threshold
volume seems louder than normal.
•
Hold the coil away from any metallic objects.
immediately release the Ground Balance button (Green Button
located on top of the Handle). Within two seconds the threshold
tone will return to its correct level.
Figure 21: Noise cancel
NOTE
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