Bench Tests - Garrett ACE 400i Owner's Manual

BENCH TESTS

You should conduct bench tests to become more familiar
with your detector's operation. To conduct a bench test:
1. Place the searchcoil on a flat, non-metallic surface that is
several feet from other metallic objects.
2. Select the ZERO-DISC mode.
3. Pass various metal objects (coins, bottle caps, nails, etc.)
across the searchcoil at a distance of 8 to 10cm. Your
metal detector will audibly and visually identify the target.
4. Perform this test in all the modes available on your
detector. Observe the sounds as well as the graphics on
the LCD that are made in each mode.
5. Record the results of your bench tests and refer to them
when hunting in the field.
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Once you have determined how your test targets register
on the Target ID during bench tests, test them in the soil. Bury
your targets at recorded depths to create a "test plot." Note
how various targets read based upon whether they are lying
in the ground flat or at various angles.
Keep accurate records or surface markers to indicate your
test plot targets and their depths. Try testing these targets
again in several months after the ground has settled, during
periods of extreme drought or after a soaking rain. Take note
of any changes in how these targets are detected.
Iron Audio bench test: Flat iron objects like bottle caps or
steel washers can appear to be good conductive targets. To
better understand the benefits of Iron Audio, use a bottle cap
to test the ACE 400i.
First, set the detector to ZERO-DISC Mode with all notches
active and pass the bottle cap across the searchcoil at a
distance of 3 to 4 inches. Note that the bottle cap's flat
surface usually gives a high Digital Target ID reading with the
tone of a "good" target.
Next, eliminate the first five notches on the left side of the
LCD, and switch on the Iron Audio feature. Pass the bottle
cap across the coil again and notice the different audio. The
clean sound has been replaced with a mixed, chirping tone
that has subtle low tones at the beginning and end, indicating
a possible junk target. Pass a conductive, coin-sized target
across the coil and note its clean high tone in comparison to
that of the bottle cap.
Record the results of your bench tests and refer to them
when hunting in the field. Knowledge of the Iron Audio feature
can reduce the amount of trash targets that are dug.
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ACE 400i
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