On completion of internal diagnostic tests, the F3Ci will emit a “heart
beat” beep every four seconds (unless targets are detected). If the
LED is switched on, the first LED will illuminate at the same time as
the heart beat.
During operation, continuous internal self-testing continues and an
alarm tone is triggered on detection of any fault condition (refer to
section 3.2 for a description of the alarm tones).
To turn the F3Ci off, pull out the On/Off Knob and rotate counter-
clockwise to the Off position. Release the switch back to the locked
position.
Figure 9: Switching on the detector
3.1. 2 Sensitivity Knob
The F3Ci can be operated using seven preset volume and sensitivity
settings. Position 4 is the default position and should always be
selected when switching on the detector and conducting the Test
Piece procedure (refer to section 4.2.3).
If the F3Ci Sensitivity Knob is rotated to the Yellow Dot position, the
detector will operate at maximum sensitivity. When Interrogation
Mode (see Section 3.1.5) is selected, under certain conditions, the
detector will emit one tone for carbon rods, and another tone for all
other targets.
The Yellow Dot on the decal indicates the position that, when
selected, places the detector into a mode that is optimised to
detect targets that are often used in the construction of improvised
explosive devices.
60cm
(24 in)
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