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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.

 

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 " from the end of the probe.

Drawing showing a magnetic detector laying on its side while tracing along a metal fence.

 

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

  1. Setting up the transmitter for Inductive Locating

  2. The Pipehorn 6 Steps to an Accurate Locate

  3. Setting up the transmitter for Conductive Locating

  4. Using the transmitter to Avoid "Bleed-over" (Inductive)

  5. Proper Pinpointing

  6. Isolating lines and Nulling out adjacent conductors

  7. Performing a Sweep of an area

  8. Download the Quick Guide!

 

Ferromagnetic Locator Tips

  1. Searching Near a Fence or Metal Building

  2. Pinpointing and Tracing Objects

  3. Proper Sensitivity Setting

 

 

 

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Last modified: 01/08/2016

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