F3 Field Service Manual – Level 1 Maintenance
Page 8
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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 the
source of any electrical interference. Once detected, the F3 will automatically
select a different operating frequency to eliminate or reduce the interference.
•
If the correct sequence of Noise Cancel beeps is not heard, go to Section 4.2
for faultfinding procedures.
2.2.3. Audio Reset Test
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Hold the coil at least 600mm (24ins) off the ground and away from any
metallic objects.
Note:
If the threshold seems to be at the correct volume, position the coil near a
piece of metal to conduct this procedure (If the coil is brought near a piece of
metal and the Audio reset Procedure is successfully completed, when the coil
is moved away from the piece of metal, another Audio Reset procedure will
need to be completed).
•
Press and immediately release the Ground Balance button (Green Button
located on top of the Handle (if the button is held too long, the detector will
begin to Ground Balance).
Figure 3 Audio Reset Procedure
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Within two seconds the threshold tone will return to its correct level.
•
If the threshold tone does not return to the correct level, go to Section 4.3 for
faultfinding procedures.
2.2.4. Ground Balance Test
Note:
Ensure the operator’s hands and arms are free of metallic objects (watches,
rings etc), and that no other metallic objects are near the coil.
a.
If a Ground Balance Test Piece is being used:
•
Hold the ground balance button down for 3-4 seconds; this will reset the
detector internal ground balance setting.
•
Ensure that the coil is held stationary and away from any metal during this
procedure.
•
Move the Ground Balance Test Piece from approximately 150mm (6ins)
above the centre of the coil slowly towards the centre of the coil, a response
should be heard.
•
Press down and hold the green Ground Balance button whilst moving the
Ground Balance Test Piece from approximately 150mm (6ins) above the
centre of the coil slowly towards the centre of the coil (and touching the coil),
then out again approximately 150mm (6ins). Continue to move the Ground
Balance Test Piece slowly to and from the coil until the ‘Ground Balance OK’
tone is heard. (‘Ground Balance OK’ tone consists of a short high-pitched
double beep).
•
Release the Ground Balance button.
