Minelab F1A4 Manuel de service télécharger pdf (Page 8)

F1A4 Field Service Manual – Level 1 and Level 2 Maintenance

Page 8

2.2 FUNCTIONAL TESTING

This section details functional testing of the F1A4. It should be used to

confirm serviceability of an F1A4 before it is returned to the field for use and

whenever doubt exists about the serviceability of an F1A4. The F1A4 must pass all

these tests to be considered serviceable. Remedial action is included for repair if

required. If remedial action is completed (ie the F1A4 is repaired using these

procedures), the full functional test should be repeated from Section 2.2.1.

Ground Balance (GB) Test Piece

is required to properly test the F1A4.

This is needed to simulate mineralised or “noisy” ground and ensure correct F1A4

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 F1A4.

Procedure:

Ensure the coil connector ‘clicks’ in to the socket. If the coil

plug does not ‘click’ in, replace the coil plug washer, if the coil

plug still does not ‘click’ in, send the coil to an accredited F1A4

Level 2 maintenance workshop.

Note: The Coil must not be near any metal objects, and the technician must not wear

any rings, bracelets, or watches during this procedure.

2.2.1 Initial Power On Test

Switch the F1A4 on to the Search position. The detector should take six

seconds to run through the start up routine, comprising four rising tones followed by

a continuous background threshold tone. F1A4 target response is indicated by a

clear change in the threshold tone. The amount of change is dependent on the size

of the target (larger target – louder response) and the distance from the coil to the

target (closer to coil – louder response). If the correct tones or threshold are not

heard the faulty control box (or battery carrier) should be replaced or the F1A4

should be sent to an accredited F1A4 Level 2 maintenance workshop.

2.2.2 Sensitivity Testing

Hold the Test Piece Mine Detector in one hand, with the end containing the

target away from the Coil. Move the

Test Piece Mine Detector

towards the centre

of the coil until it lightly touches the centre of the coil and then move it sideways off

the coil (the

Test Piece Mine Detector

should be moved slowly and smoothly during

this procedure). A soft but distinct change in the threshold tone should be heard.

P0263-B

If a response is not heard replace the faulty Control Box (or Coil, see Section

3.4) or the F1A4 should be sent to an accredited F1A4 Level 2 maintenance

workshop for repair.

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Minelab F1A4 Manuel de service Page 8

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