Garrett Metal Detectors Master Hunter CX Plus - Manual (Page 13)

www.garrett.com  Master Hunter ® CX Plus Owner’s Manual 
BENCH TESTING
This will enable a treasure hunter to learn about the
discriminating capabilities of the CX Plus before tak-
ing it into the field. The following tests should be per-
formed with the search coil perpendicular to a bench,
floor or other non-metallic surface:
1. Rotate both Multi-Range Discrimination controls
fully counter clockwise. Bring various metallic targets
across the bottom of the searchcoil at a distance of
about two inches. Each target will cause the sound
to increase, a characteristic of true non-discriminat-
ing operation.
2. Rotate the Ferrous control to the 3 or 4 position
and the sound will decrease or cease when small
nails are scanned across the bottom of the search-
coil.
3. Rotate the control farther and the sound will di-
minish as steel bottlecaps are tested. You will note
that nails, foils and other small junk items will also be
rejected (i.e. cause no increase in sound).
4. Rotate the Non-Ferrous control farther clockwise
and pulltabs will be rejected. At this setting you will
note that nickels and some rings will also be reject-
ed. The conductivity of this type of target is not great
enough to cause the detector to respond when the
Discrimination controls are set at a high number.
5. You may find that slight adjustments to the Dis-
crimination controls may be necessary. For exam-
ple, you may wish to eliminate almost all trash from
the audio response, yet get an audio signal from all
coins. Adjust the Ferrous control on the left to reject
small iron trash yet still accept nickels. Adjust the
Non-ferrous control to accept all other coins.
6. Experiment with the two control knobs and vari-