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4. F3L Configuration
4.1 Introduction. Detectors fitted with the LED Display and
Volume/Sensitivity (V/S) Control leave the factory with the LED
Display and Volume/Sensitivity Control enabled. The LEDs give an
operator a visual indication of the size and proximity of a target. The
V/S Control provides the facility to reduce or increase V/S levels to
suit specific detection circumstances. If required, the LED display
and the ability to vary V/S levels can be disabled on the F3L.
4.2 Description. The F3L is fitted with a modified speaker
pod comprising (Figure 13):
• 13 red LED display to display target strength and proximity
• Volume/Sensitivity increase button and Volume/Sensitivity
decrease button .
• Red “Battery Low” alarm LED.
• Quick guide to enable and disable all LEDs.
• Quick guide to enable and disable V/S control buttons.
Volume/Sensitivity Control buttons
Target Strength LEDs
(13 total)
Target Strength LEDs
(13 total)
“Battery Low”
Alarm LED
Quick guide to
enable and disable
LED Display
Quick Guide to
enable and disable
Volume/Sensitivity
Control buttons
Figure 13: F3L Speaker Pod
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