Functional Testing - Minelab F3 Service Manual

F3 Service Manual
3.2

Functional Testing.

Functional testing is used to confirm the 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 tests to be considered serviceable and ready for use in operations.
Whenever a line replaceable unit is replaced, all functional testing must be completed.
Functional testing requires a ground balance test piece. The ground balance test
piece simulates mineralised ground which results in an alarm from the F3.
mineralised "hot" rock or adequate amounts of local mineralised soil is suitable.
Alternatively, a floor tile Ceramic or clay) may be suitable for use as a ground balance
test piece.
Do not use any metal object as a ground balance test piece.
a. Switch ON Test. The Switch ON Test checks that power is correctly supplied
to the electronics pack and internal diagnostics discover no system fault. The test is
conducted as follows:

Extend the lower shaft at least 15cm (6ins).

Hold the coil at least 60cm (24ins) from the ground and away from any metallic
objects and switch on.

Ensure that a series of rising tones occurs over approximately 12 seconds. A
steady threshold tone should be heard a few seconds after the rising tones
finish.

If the correct tones are not heard, check that good batteries are being used and
that the batteries are correctly inserted.

If the correct tones are still not heard refer to section
Procedures.
b. Noise Cancel Test. This test ensures the F3 successfully completes the noise
cancel procedure required whenever local electrical interference is present. During
the test, the Noise Cancel button, wiring loom and electronics pack are checked for
correct operation. The test is conducted as follows:

Hold the coil stationary and at least 60cm (24ins) above the ground and away
from any large metal objects during the test.
NOTE
Figure 4: Switch ON Test
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5 Fault Finding