186 Chapter 2
Front-Panel Key Reference
SPAN X Scale
Zero Span Changes the frequency span to zero. In this mode, the current center
frequency is displayed in the time domain (the x-axis is displayed in
units of time), like a conventional oscilloscope.
Sweep times faster than those in the frequency domain display mode
are available if Option AYX or B7D are installed.
Resolution Bandwidths less than 1 kHz are unavailable when in zero
span if the sweep time is being achieved by utilizing the Option AYX or
B7D.
Key Access:
SPAN X Scale
NOTE Sweep times that would require Option AYX or Option B7D are not
available in zero span if the Resolution Bandwidth is less than 1 kHz.
NOTE Zero Span is not available when Segmented (On) is selected. Segments
in the segmented sweep function can be set to zero span by setting the
span parameter in the segmented sweep editor to 0 Hz. (
Sweep,
Segmented, Modify, Edit, Span)
NOTE The minimum number of sweep points in zero span varies with
firmware revision:
NOTE Zero Span sets Signal Track (Off) and FREQUENCY, Scale Type to linear
mode.
Last Span Changes the analyzer frequency span to the previous span setting. If
pressed after
Signal Track is turned off, the span setting returns to the
span that was in effect before
Signal Track was turned on. This is true,
even if
Signal Track was turned on as part of Span Zoom. Last span sets
Segmented (Off). The state of Frequency, Scale Type Log Lin is included in
the recalled information.
Key Access:
SPAN X Scale
Zone
Accesses menu keys that allow you to control the two-window zone
function. This function allows you to have an upper window with a
broad display of frequency and two zone markers (vertical bars) that
define the span for the lower window. This function is only available on
ESA-E Series Analyzers (E4401B, E4402B, E4404B, E4405B, and
E4407B).
Key Access:
SPAN X Scale
Firmware Revision Minimum # of Sweep Points in Zero Span
≤
A.03.03 401 (fixed)
A.04.xx 101
≥
A.05.00 2
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