Glossary
54 80E00 ElectricalSampling Modules User Manual
Electrical Overstress (EOS)
Electrical overstress occurs when an electronic device is s ubjected to an
input voltage higher than the designed maximum tolerablelevel.
External Attenuation
A decreasein magnitude of current, voltage or power of a signal that is
outside the sampling module.
Impedance
The opposition to an AC signal in the wire.Impedance is very much like
resistanceto a DC signal in a DC circuit. Impedance is made up of resistance
and inductive andcapacitive reactance.
IncidentStep
The electricalenergy transmitted by the TDR step generator. An acquired
waveformshows this step and all reflections on the signal conductor.
Initialize
Setting the main instrumentto a completely known, default condition.
Internal Clock
A trigger sourcegenerated internally within the instrument and used to
synchronizeTDR step generators.Also available at the front panel Internal
Clock Output connector.
Rho (ρ)
When making TDR measurements,the ratio of the incident step to the
reflected step. A value of one (1) indicat es complete reflection.
Setting
The state ofthe front panel and system at a given time.
TDR
Time-DomainReflectometer: an instrument that sends out steps of energy
and measuresthe amplitude and time interval of the reflections. If the
velocity of theenergy through the cable is known, distances to features can
be computed anddisplayed. Conversely, the speed that energy travels
through a cableof known length can also be computed. The way in which
the energyis reflected and the amount of the energy reflectedindicate the
condition of the cable.
Time Domain Transmission (TDT)
A method of characterizinga transmission line or network by transmitting a
signal through the networkand monitoring the output.
Trigger
An electricalevent that initiates acquisition of a sample as specified by the
time base.
Waveform
The visible representationof an input signal or combination of signals.