4.1 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). In far field
situations, one can calculate the magnetic field
for the electric field value. This meter can
display the calculated magnetic field strength.
4.2 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
)
4.3 The Characteristic of Electromagnetic
Fields
Electromagnetic fields propagate as waves
and travel at the speed of light (C). The
wavelength is proportional to the frequency.
λ (wavelength) = C (speed of light) /
f (frequency)
If the distance to the field source is less than
three wavelengths, then we are usually in
the near field. If the distance is more than
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