R3131 Spectrum Analyzer Operation Manual
3.3 Menu Function Descriptions
3-50 Apr 10/98
3.3.25 SPAN Key (Frequency Span)
When pressed, this key displays the SPAN menu, and allows you to set a frequency span. In addition, the
center frequency and frequency span are displayed in the annotation area below the bottom scale line.
Full Span Sets a center frequency of 1.5 GHz, and a frequency span of 3
GHz.
Zero Span Set a zero span at the center frequency. In zero span mode, the
frequency span is 0 Hz, and the spectrum analyzer operates as a
tuned receiver. The horizontal axis is the time axis. The receiving
bandwidth is determined according to the selected resolution
bandwidth.
Peak Zoom Moves the marker to the maximum peak within the search object
range, and sets the marker frequency as the center frequency. In
addition, the frequency span is changed to 1/10 of the current
frequency span.
Last Span Resets the frequency span to the previous value.
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