13.3 Accessories
Narda NBM-550 139
H-field Magnetic field
Magnetic fields are generated by moving electrical
charges. Magnetic field strength H is expressed in
Amperes per meter: H = [A/m].
Isotropy From the Greek: isos = same; tropos = turning, direction.
Signifies the degree to which a characteristic is
independent of its direction. An antenna that measures
isotropically is therefore an ideal antenna that would yield
the same result in all spatial directions regardless of its
orientation.
NAD83 North American Datum of 1983
NAD83 is an earthbound reference point based on the
Geodetic Reference System of 1980. This has determined
the size and shape of the earth to an accuracy of 2 meters
using satellites and electronic measuring systems.
RMS Root mean square: This term describes an average
(mean) obtained by taking the square root of the average
of the squares of the measured values; this method is
used when measuring high-frequency electromagnetic
field strengths. The averaging corresponds to a linear
average of power density values.
RSS Root Sum Square
Formula used to calculate the total field strength from the
three spatial components X, Y, and Z:
SPS The standard positioning service works with the C/A Code
(Coarse/Acquisition Code) and is available for general,
civilian use.
S-field Product of E-field and H-field, expressed as power density
or electromagnetic power flux density. The power density
S is expressed in Watts per unit area: S = [W/m
2
]
(or [mW/cm
2
] or [μW/cm
2
])
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