14 Glossary
140 NBM-550 Narda
TEM cell Transverse Electromagnetic Cell
TEM cells are used to perform RF supported noise
immunity investigations or emission measurements. They
are much smaller than an EMC cabin (maybe just large
enough to hold a PC), and are basically a coaxial
conductor expanded into rectangular form for generating
transverse electric fields. If the frequency range is
extended upwards into the gigahertz range, the cells are
called GTEM cells (Gigahertz Transverse Electromagnetic
Cell).
USB Universal Serial Bus
USB is a bus system used to connect a computer to
peripheral devices. Equipment fitted with USB can be
connected and disconnected while running (hot plugging).
The connected devices and their properties are detected
automatically.
WAAS Wide Area Augmentation System
WAAS is part of the SBAS (Satellite-Based Augmentation
System) for improving the existing US GPS. WAAS
signals are transmitted by separate satellites on the same
frequencies as GPS and serve to improve the relatively
inaccurate GPS position information.
WAV The WAV file format is a container format for digitally
storing audio data, which can contain compressed audio
data in addition to the usual uncompressed PCM raw data.
It has become the de-facto standard for storing digital
audio data on MS Windows-based PC systems.
WGS84 World Geodetic System 1984
WGS84 is a system used for surveying the earth, which
was introduced by the Americans in 1984 along with the
triumph of satellite navigation. WGS84 includes both the
reference point as well as the ellipsoid and is the geodetic
basis for GPS.
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