Searching Near a Fence or Metal Building with a MagHorn
Typically, under ideal situations you should be able to locate within 2 to 3 inches from a fence using "normal" upright techniques.
However, sometimes you may need to use a "Null" style of locating, which is described as follows:
Near the fence or building where the target object is suspected to be, position the MagHorn as shown in the sketch below.
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Set the sensitivity to get a strong tone.
Slowly sweep back and forth in a line along the fence or building. Moving forward in small increments will prevent passing over the target.
When you are over a ferrous object, the signal output will drop dramatically.
When this happens, the object has been located at approximately 1 ½" from the end of the probe. |
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Moving the probe even slightly from this "Null" area should create an immediate increase in signal, thus allowing you to trace the outline of the located object.
Table of Contents
Pipe and Cable Locator Tips
Ferromagnetic Locator Tips