The success of locating a buried object depends on your familiarity with the magnetic signature of various targets and the corresponding response of the locator's audio signal.
Locator's audio signal responds to the magnetic signature of a survey
marker.
As
the locator is moved over the target, the waveform depicts the
increase in the frequency of the locator's 20 Hz audio idling
signal. The highest frequency occurs when the locator is directly
over a vertical target, and over both ends of a horizontal target.
The audio signal peaks over identical magnetic signatures at two joints of a
cast-iron water line.
Locating a
survey marker in close proximity to a steel fence is no problem with the
DML2000.
Manhole covers
normally appear as short horizontal dipoles with the peak signal
level occurring at the perimeter of the manhole cover.
Frequency
peaking occurs directly over service connections and valve boxes.
