8
SRM – WHAT FOR?
SRM: FOR EVERYTHING
Electromagnetic fields always consist of an electrical and
a magnetic field component. Limit values are therefore
specified for both the electric as well as the magnetic
field strength.
The electric and magnetic field strengths at a distance
from the source are in a fixed relationship, so it is suffi-
cient to measure just one of the two components. This
relationship does not apply close to the source, so both
components must be determined separately.
The wavelength of the radiation determines the location
of the near-field and the far-field. The near-field of a
long wave transmitter extends for several kilometers.
The near-field for mobile phone antennas ends within
the space of about one meter.
Narda Safety Test Solutions has developed a thoroughly
researched range of measuring antennas. They make
the SRM into a universal measuring set for electric and
magnetic fields – from long wave up to the latest gene-
ration of mobile phone frequencies.
The isotropic (three-axis)
measuring antenna for electric
fields (E-fields) up to 3 GHz
is the all-round solution for
trouble-free measurements
covering VSW to UMTS.
Inside the isotropic electric
field measuring antenna,
showing three dipoles
arranged at mutual
right angles.