ABOUT YOUR DETECTOR
Fisher Research Laboratory has been producing rugged, high
quality, high performance metal detectors since 1931, longer
than any other company in the world. Your IMPULSE is a
product of that proud heritage. Designed for deep-sea
treasure hunting, the IMPULSE will also do the job in surf, on the
beach, in fresh water or on land.
Pulse induction (PI) metal detectors have been around for
years. Their ability to detect metal in black sand and salt water
make pulse induction metal detectors particularly suited to
underwater treasure hunting, wreck diving, shallow-water
treasure hunting and beach combing. However, pulse
induction metal detectors have had their drawbacks. Most
have been heavy, expensive and unstable, requiring the
operator to retune frequently. Pulse induction metal detectors
also have had high battery drain, creating frustrating power
loss and added expense.
But worst of all, pulse induction metal detectors have been
plagued by slow response. Because the search coil is slow to
respond to a target, sensitivity and depth can be maximized
only at slow sweep speeds, forcing the operator to slow
down, thereby covering less ground. “Autotune” pulse
induction detectors do have a rapid response, but the search
coil must be in motion to detect a target.
In 1985, engineers at Fisher Research Laboratory began work
on a new pulse induction metal detector, one that would
combine extreme depth in salt water with high battery
performance, stability, low cost and fast target response.
Their answer is the IMPULSE—a no-motion detector that
responds instantly to targets and frees the operator to hunt
fast, slow or with no motion at all. In addition, battery life of the
IMPULSE has been greatly extended over previous pulse
induction detectors. In fact, battery life of the IMPULSE is
better than most induction-balance metal detectors. And
stability is greatly improved. There’s no need to retune the
IMPULSE every few feet.
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