Applications of the DML 2000


	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.

When searching for a Concrete Septic Tank you can expect an increase in the audio output signal as you approach the tank with the strongest signal occurring directly over the two handles on the cover.


Frequency peaking occurs directly over service connections and valve boxes.

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The depths outlined here are typical responses. There have however been numerous instances where targets have been located at far greater depths. In almost every case the magnetic locator operator used his instrument almost daily and knew how to get the maximum out of his instrument. He was magnetically clean, his search area was well defined and contained a minimum amount of trash metal, he held his instrument in a vertical position and he used the maximum sensitivity setting.

Target	Depth
Iron Marker (3/4� x 18�)	6 - 8 feet
Cast-Iron Pipe (4� Pipe)	4 - 5 feet
Manhole Cover	3 - 4 feet
Well Casing	8 - 10 feet
PK Nail (1��)	6 - 10 inches
Iron Valve	4 - 5 feet
55 Gallon drum	5 - 6 feet
Septic Tank (Handles)	3 - 5 feet