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APPLICATION NOTES
Basic Signal Patterns
Audio signal peaks
Audio signal peaks over each end
directly over vertical
of a horizontal target. Visual indica-
target. Visual indications
tions peak positive over one end
also peak as either
and negative over the other end.
polarity.
+ or -
+
-
Figure 7. 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 (XTd model only)
readout. 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 is ideal for pinpointing small
objects. A 1-1/4 inch PK nail buried up to 8 inches can be located so precisely with this technique that it
can be uncovered using a 1/2 inch star drill.
Figure 8. "X" Pattern provides Precision Locating
If you are looking for a corner marker and detect two or three signals in the same general vicinity, decrease
the gain setting before you get a shovel. Any signal that disappears when the gain is decreased is probably
Summary of Contents for GA-92 XT
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