Diagnostic Tools
Gauss and tesla meters

A gauss meter measures electric and magnetic fields (EMFs), which are produced by power lines, electrical wiring, and electrical equipment . Sometimes these may cause problems with network devices and operation. EMFs are invisible lines of force that surround any electrical device. Electric fields are produced by voltage and increase in strength as the voltage increases. The electric field strength is measured in units of volts per meter (V/m). Magnetic fields result from the flow of current through wires or electrical devices and increase in strength as the current increases.

Magnetic fields are measured in units of gauss (G) or tesla (T). Most electrical equipment has to be turned on for a magnetic field to be produced, since current must be flowing. Electric fields are present even when the equipment is switched off, as long as it remains connected to the source of electric power.

Electric fields are shielded or weakened by materials that conduct electricity including trees, buildings, and human skin. Magnetic fields pass through most materials and are therefore more difficult to shield. Both electric and magnetic fields decrease as the distance from the source increases.


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