Size And Depth Of Buried Objects; Emi - Teknetics Alpha 2000 Owner's Manual

THE BASICS (continued)

4. Size and Depth of Buried Objects

The relative depth of an object is displayed at the left of the display as a 1
digit number, 0 to 9 inches. The size of an object can be determined using
sweep techniques described later in the manual.
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
that the detector creates is also susceptible to the electromagnetic energy
produced by other electronic devices. 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,
so if you experience erratic behavior or "false" signals, reduce the
sensitivity.
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