Garrett Metal Detectors Metal Detectors GTAx 550 - Manual (Page 36)

BENCH TESTS
Bench Tests enable you to test typical trash items
and to learn about the discrimination capabilities
of the GTAx 550 before taking it into the field or
trying to set your own discrimination notches.
The following tests should be performed with the
searchcoil perpendicular to a bench, floor or other
non-metallic surface and several feet away from any
metallic object.
1. Select the factory preset A mode of operation
with no discrimination (all Lower scale segments
displayed). Bring various metallic targets across the
bottom of the coil at a distance of about two inches.
All targets will cause the sound to increase, which
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