1-4 Option 100 Fault Location and SRL
Introduction and Measurement Theory
Fault Location Measurement Theory
How the Analyzer Converts Frequency Data
to Distance Data
Fault-location measurements are single-ended measurements, meaning
that only one end of a cable under test need be connected to the
analyzer's RF OUT (or PORT 1) test port.
This type of measurement is generally called a reflection measurement
and typically displays a response commonly known as return loss.
The analyzer performs swept-frequency measurements of return loss
versus frequency, then uses the Fourier transform to convert the
response-versus-frequency to a response-versus-distance. The analyzer's
internal computer makes the calculation by using either the inverse
discrete Fourier transform (inverse FFT) technique or the chirp-Z
Fourier transform technique.
The Fourier transform technique is essentially a process of adding the
signals measured by the analyzer in the frequency domain and
combining them to create the fault-location response in the time domain.
The resulting measurement is an error-corrected fault-location response
of the cable under test.
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