Minelab F3 COMPACT Service Manual page 7

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2.2 Functional Testing
a. Functional testing is used to confirm the serviceability of an F3 COMPACT before it is
returned to the field for use and whenever doubt exists about its serviceability. The F3
COMPACT must pass all tests to be considered serviceable and ready for operations. Whenever
a line replaceable unit is replaced or a repair is conducted, all functional testing must be
completed.
b. Functional testing requires a ground balance test piece. The ground balance test piece
simulates mineralised ground which results in an alarm from the detector. A mineralised "hot"
rock or adequate amounts of local mineralised soil is suitable. Alternatively, a ceramic floor tile
or clay roof tile may be suitable for use as a ground balance test piece.
c. The Switch On Test. The switch on test checks that power is correctly supplied to the F3
COMPACT and internal diagnostics discover no system fault. The test is conducted as follows:
Prepare the detector for use.
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Hold the coil at least 60cm (24in) away from the ground and any metal objects.
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Set sensitivity knob to the default position 4.
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Switch on.
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Ensure that four (4) or five (5) rising tones occur over approximately 12 seconds. The F3
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COMPACT then begins detecting metal, if there is no detection after 15 seconds a
heartbeat tone will sound.
d. Noise Cancel Test. The noise cancel test ensures the F3 COMPACT successfully
completes the noise cancel procedure required whenever local electrical interference is present.
The test is conducted as follows:
Hold the coil stationary and at least 60cm (24 in) above the ground and away from any
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metal objects during the test.
Press and hold the Noise Cancel button for two (2) seconds and then release it. (Figure 4)
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Figure 3: Switch On
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F3 COMPACT Service Manual