9
16
4. Size and Depth of Buried Objects
When using the detector in the motion DISCRIMINATION or ALL-METALS
modes, the relative depth of an object is displayed at the bottom of the
display in a 3-segment format: shallow, medium, or deep. A more accurate
depth reading is available in no-motion mode, using PINPOINT. This modes
display target depth in inches. This no-motion mode does not require the
coil to be in motion to detect metals. The ability to hold the searchcoil
motionless over the target also aids in tracing an outline of the buried
object, or in pinpointing the exact location of the object using techniques
described in the pinpointing section.
5. Electromagnetic Interference (EMI)
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.
THE BASICS
continued
How to Pinpoint
Position the searchcoil an inch or two
(2.5-5cm) above the ground, and to the
side of the target. Then press and hold
. Now move the searchcoil slowly
across the target, and the sound will
communicate the target’s location. As
you sweep from side to side, and hear
no sound at the ends of the sweep, the
target is located in the middle of that
zone, where the sound is loudest. If the
sound is loud over a wide area, the
buried object is large. Use Pinpoint to
trace an outline of such large objects.
Narrow It Down
To further narrow the field of detection,
position the searchcoil near the center
of the response pattern (but not at the
exact center), release
, and
then quickly press-and-hold it again.
Now you will only hear a response
when the searchcoil is right over the
top of the target. Repeat this
procedure to narrow the zone even
further. Each time you repeat the
procedure, the field of detection will
narrow further.
Consider Purchasing a Pinpointer
When you kneel down to unearth an
object, you may find it frustrating as the
object can appear exactly like the
surrounding soil. You may hold the
object in your hand, and find it
necessary to pass a handful of dirt over
the searchcoil to see if it contains
metal. An easier way is to use a
handheld pinpointer. It is a probe-like
device which is poked into the ground,
making close up pinpointing a snap,
reducing digging time, and minimizing
the size of the holes you will dig.
TEKNETICS offers a robust and
inexpensive pinpointer designed for
this purpose.
OPERATION and CONTROLS
cont.
MODE SELECTIONS
continued
CORRECT
WRONG
