Underwater - Fisher Impulse Operating Manual

SEARCHING
NOTE:
Your threshold tone will probably
go up and down as you search.
This is a perfectly normal response
since the distance between your
coil and the ground varies as you
sweep the coil back and forth. You may want to readjust your
threshold level slightly to maintain a comfortable "average"
threshold volume. You will also have to readjust it if the ground
mineralization changes sufficiently or if you enter or leave wet
sand.

UNDERWATER

The IMPULSE is waterproof to 250 feet, and it operates the
same underwater as on land. However, some differences in
search technique should be noted.
been.
7. Take your time. If
you walk too fast you
can't overlap your
sweeps, and you'll
miss a lot of ground.
1. Tune your IMPULSE underwater, on the bottom.
You may want to run your threshold tone and
volume slightly higher than you would on land. If
you're wearing a hood, you'll probably have to
turn the volume control to maximum.
2. Keep the coil as far away from you (and your
dive gear) as possible. Sweep the search coil
back and forth in a wide semi-circle in front of
you to cover the bottom in a methodical
manner.
3. Keep the coil parallel and as close to the
bottom as possible. Overlap your sweeps at least
50 percent.
4. Because your IMPULSE is a no-motion detector,
you can detect buried metallic objects in cracks,
crevices and out-of-the-way places without
The LCD
indicates signal
strength and
continuously
monitors
battery
conditions.
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