R&S ZVL GUI Reference
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Operating Manual 1303.6580.32-06
183
The parameters of the impulse response and frequency-domain representation are related due to the
mathematical properties of the time-domain transform. In practice, this means that the sweep points may
have to be adjusted to the length of the transmission line and the expected distance-to-fault:
• The impulse-response resolution is proportional to the measured sweep range: The larger the
sweep range (span), the better the resolution.
• At fixed frequency span, the maximum distance that can be measured is proportional to the
number of sweep points (i.e. inversely proportional to the Frequency Step Size). The larger the
Number of Points, the longer the maximum distance between the calibrated reference plane (most
conveniently, PORT 2 of the analyzer) and the located fault.
• The R&S ZVL can automatically determine a suitable number of sweep points (Auto Number of
Points). Moreover it is possible to define which of the peaks will be considered as being due to a
fault, and to draw up and export a list of the detected peaks.
• Start Distance and Stop Distance define the distance window for the distance-to-fault
measurement.
• Stimulus Frequency opens a submenu to define the frequency stimulus axis.
• Auto Number of Points adjusts the number of sweep points in order to provide an unambiguous
display of the fault locations.
• Cable Type opens a dialog to select a standard (predefined) cable type or add a cable with
arbitrary permittivity.
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