F3 Field Service Manual – Level 1 Maintenance
Page 7
2.2. FUNCTIONAL TESTING
This section details functional testing of the F3. It should be used to confirm
serviceability of an F3 before it is returned to the field for use and whenever doubt
exists about the serviceability of an F3. The F3
must
pass all these tests to be
considered serviceable. References to faultfinding procedures in Section 4 are
included for repair as required. If a repair is completed, the full functional test
should be repeated from Section 2.2.1.
Note:
A Ground Balance (GB) Test Piece is required to properly test the F3. This
is needed to simulate mineralised or “noisy” ground and ensure correct F3
Ground Balance operation. The GB Test Piece can be a local piece of
mineralised ground (hot rock or a fired tile) that produces a response from the
F3.
2.2.1. Switch On Test
•
Hold the coil at least 600mm (24ins) from the ground and away from any
metallic objects and switch on the F3.
•
Ensure that four or five rising tones taking 12 to 15 seconds are heard. A
steady threshold tone should be heard a few seconds after the rising tones
finish.
Figure 1 Switch On Procedure
•
If the correct tones are not heard, check that good batteries are being used
and that the batteries are fitted correctly.
•
If the correct tones are still not heard go to Section 4.1 for faultfinding
procedures.
2.2.2. Noise Cancel Test
•
Hold the coil stationary and at least 600mm (24ins) above the ground. Press
and immediately release the Noise Cancel button (black button located
behind the handle).
Note:
The coil should not be moved during this procedure nor should metallic
objects be brought near the coil during this procedure.
Figure 2 Noise Cancel Procedure
