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Terms and Descriptions
Table 2 defines the terms used throughout the document and provides
information to assist you with proper operation and understanding of the
unit and its functions.
Terms
Nominal Velocity of
Propagation (NVP)
Safety Extra Low
Voltage (SELV)
F-Connector
Spread Spectrum
Time Domain
Reflectometry
(SSTDR)
Table 2. Terms and Descriptions
Description and Uses
Also known as the Velocity of Propagation (VOP),
NVP is the speed of an electrical signal traveling
through a cable, measured as a percentage of the
speed of light.
▪ A rating determined by the International Electro-
technical Commission that defines safe voltage
standards when using electronic devices.
▪ SELV is 60 volts DC or Peak AC (45 volts RMS).
▪ Connector for a coaxial cable.
▪ Spread spectrum is the technological foundation of
cell phone communications and is used to transmit
a small, but nevertheless recognizable, signal in a
high noise environment.
▪ By combining spread spectrum with TDR technol-
ogy, SSTDR allows for a length test on cables
without interference from voltage.
4
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