F3 Operations Manual
19
Tones Event Description
Start-Up Internal checks when
the F3 is switched on
Four rising tones over
12 seconds
Threshold Signifies correct
operation of detector
Steady low volume
continuous tone
Ground Balance Indicates successful
Ground Balance
procedure completed
One fast high pitched
double beep
Target Indicates metal target
detected
Increases volume
(compared to
Threshold Tone) and
high or low pitch
depending on target
metal composition and
depth
Low Battery Indicates batteries do
not have enough
charge to continue
detection
High pitched fast
continuous oscillating
tone
Equipment Fault Indicates failure of
detector component or
a dislodged Red
Sensitivity Endcap
Low pitched slow
oscillating tone (ee-
aww, ee-aww)
Coil Fault Indicates coil not
connected or not
receiving sufficient
current
Low pitched double
tone every five
seconds
Noise Cancel Indicates Noise Cancel
procedure is occurring
Two single beeps
followed by 45 seconds
of short double beeps
finishing with four
single beeps
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