2
2. INTRODUCTION
2-1 Fundamentals
Electromagnetic pollution :
This Meter used to indicate electromagnetic pollution generated
artificially. Wherever there is a voltage or a current, the electric (E)
and magnetic (H) fields arise. All types of radio broadcasting and TV
transmitters produce electromagnetic fields, and they also arise in
industry, business and the home, where they affect us even if our
sense organs perceive nothing.
Electric field strength (E) :
A field vector quantity that represents the force (F) on an infinitesimal
unit positive test charge (q) at a point divided by that charge. Electric
field strength is expressed in units of volts per meter (V/m).
Use the units of electric field strength for measurements in the following
situations:
•
In the near-field area of the source.
•
Where the nature of the electromagnetic field is unknown.
Magnetic field strength (H) :
A field vector that is equal to the magnetic flux density divided by the
permeability of the medium. Magnetic field strength is expressed in
units of amperes per meter (A/m).
The meter uses of magnetic field strength for measurements only in
the far-field area of the source.
Power density (S) :
Power per unit area normal to the direction of propagation, usually
expressed in units of watts per square meter (W/m
2
) or, for convenience,
units such as milliwatts per square centimeter (mW/cm
2
).
