Glossary
Glossary–4
1503C MTDR User Manual
In a cable, a broken conductor will not allow electrical energy to flow through it.
These circuits are also called broken circuits. The circuit is open to the air (which
looks like a very high impedance).
The statistical spread or variation in a value repeatedly measured, generated, or
displayed under constant conditions. Also called repeatability.
A conductor’s opposition to the flow of AC electrical energy through it. All
conductors have some reactance. Reactance is made up of capacitance and
inductance. Capacitance is the ability of conductors separated by thin layers if
insulation (dielectric) to store energy between them. Inductance is the ability of a
conductor to produce induced voltage when the electrical current through it varies.
All conductors have some capacitance and inductance, so all conductors have some
reactance, which means they all have impedance.
An instrument that uses reflections to make measurements. Our reflectometers use
electrical energy that is reflected back from points along a cable.
A conductor’s opposition to the flow of DC electrical energy through it. All
conductors have a certain amount of resistance. Resistance is the low (or zero)
frequency part of impedance.
For a given parameter, the smallest increment or change in value that can be
measured, generated, or displayed.
The amount of energy reflected or returned from a cable indicates how much the
impedance in the system is mismatched. The ratio of the energy sent out by the TDR,
divided by the energy reflected back, expressed in the logarithmic dB scale, is called
return loss.
(see Millirho)
The time it takes a pulse signal to go from 10% to 90% of the change in voltage.
An acronym for Root Mean Squared. RMS is a way of measuring how much
deviation there is from a known (or desired) waveform. It is also the method used
to calculate how much power is contained in an AC waveform.
Our instruments make measurements by taking a succession of samples in time and
displaying them as a waveform with voltage on the vertical scale (up and down) and
Open Circuit
Precision
Reactance
Reflectometer
Resistance
Resolution
Return Loss
Rho ( )
Risetime
RMS
Sampling Efficiency
Summary of Contents for 1503C
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