Chapter 1 13
Introduction and Measurement Theory
Fault Location Measurement Theory
Start/Stop Distance and Frequency Span Explanation
When the analyzer is set up for a fault location measurement, you can determine the
center frequency (when in band pass mode), and start and stop distances for the
measurement. The distance range (start distance − stop distance) determines the
frequency span, which in turn determines the start and stop frequencies.
NOTE In band pass mode (as opposed to low pass mode), you can select center frequency.
Changes to distance range do not affect the user-chosen center frequency.
The analyzer will attempt to set the frequency span to the setting required for the
distance range. The maximum setting for the frequency span cannot exceed the
analyzer's frequency capability. For instance, the start frequency cannot be lower
than the analyzer's low frequency limit, and the stop frequency cannot be higher
than the analyzer's high frequency limit.
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