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5. EMI (Electromagnetic Interference)
The searchcoil produces a magnetic field and then detects changes in that
magnetic field caused by the presence of metal objects. This magnetic field
the detector creates is also susceptible to the electromagnetic energy
produced by other electronic devices. Electric fences, cell phones, cell phone
towers, power lines, microwave ovens, lighting fixtures, TVs, computers,
motors, etc… all produce EMI which can interfere with the detector and cause
it to beep when no metal is present, and sometimes to beep erratically.
The SENSITIVITY control lets you reduce the strength of this magnetic field
and therefore lessen its susceptibility to EMI. You may want to operate at
maximum strength, but the presence of EMI may make this impossible. If
you experience erratic behavior or “false” signals, reduce the sensitivity.
THE BASICS OF METAL DETECTING
Sweep Method
Sweep the detector side-to-side over
the ground.
Keep the searchcoil parallel to the
ground as you sweep; do not lift the
searchcoil at the ends of your sweeps.
Searchcoil motion is required for target
detection.
USING THE DETECTOR
This detector is equipped with a 7” diameter round elliptical waterproof
searchcoil. This lightweight, ruggedly constructed searchcoil can be fully
submerged in water. The bottom portion of the pole assembly can also be
submerged, but the control housing and the searchcoil cable plug
connection into the housing must be kept dry.
Accessory searchcoils are also available for purchase; see back cover or
visit www.fisherlab.com. A smaller searchcoil offers more precision and fits
into tight spaces. Larger searchcoils provide for more ground coverage on
each sweep and penetrate deeper into the ground.
WATERPROOF SEARCHCOIL
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