Minelab F3 COMPACT Operation Manual page 22

F3 COMPACT Operations Manual
NOTE
When switched on, maximum sensitivity is available 30 seconds
after the Threshold Tone commences. Do not test the detector with
the Test Piece until 30 seconds after the Threshold Tone begins.
* WARNING *
The Test Piece functional test must be conducted with the
Sensitivity Knob set to Position 4 (Default) and should be
conducted whenever the detector is switched on to confirm
correct functionality of the detector.
NOTE
After switching on the detector, the LEDs will always be disabled
unless the LED On/Off button is pressed.
If an Earset Speaker OFF is connected to the detector, the LED
display will be automatically disabled for tactical reasons. However,
if required the LED display can be enabled by pressing the LED On/
Off button.
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