Product Manual

8
Basic Signal Patterns
When MAGGIE is positioned directly over a vertical target, the signal strength will peak (audio
signal, digital readout, and bar graph) at either a positive or negative polarity.
The audio signal, digital readout, and bar graph indications also peak over each end of a
horizontal target. One end is positive, the other is negative. This will help you to distinguish
between two vertical pipes or one horizontal pipe. Usually two vertical pipes buried in close
proximity will produce bar graph indications with the same polarity.
Figure 11: Signals from Vertical and Horizontal Targets
After you have detected the presence of a target, hold the locator vertically and slowly move it
back and forth in an "X" pattern while listening to the audio response and observing the bar
graph indicator. For a given gain setting the number of bars will be greatest when the locator
is directly over a vertical target, and over the ends of a horizontal target. The "X" pattern, as
shown in Figure 12, is ideal for pinpointing small objects. A 1-1/4 inch PK nail buried up to 12
inches can be located precisely with this technique.
Figure 12: The "X" pattern provides precision locating.
Audio signal peaks
directly over vertical
target. Visual indications
also peak as either
polarity.
Audio signal peaks over each end
of a horizontal target. Visual
indications peak positive over
one end and negative over the
other end.