3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
Example
:SWE:TZO:TIME 500 ms
Dependencies Only appears if the Zoomed Trace window is present
Preset 10% of Sweep Time
State Saved Saved in instrument state
Min 10% of minimum Sweep Time
Max Maximum Sweep Time
Annotation The zoom sweep time is displayed in the lower-right corner of the bottom window. The number of
points is displayed parenthetically, as
Zoom Sweep 13.3 ms (101 points)
If in an FFT sweep, the word (FFT) is added in parentheses and a ~ is used to indicate “approximate”,
as
Zoom Sweep (FFT) ~13 ms (101 points)
A “#” mark appears before “Zoom Sweep” in the annotation when Sweep Time is switched from Auto
to Manual coupling. Note that this # does not appear when in zero span, as there is neither an
autocoupled nor a manual state in zero span; there is no coupling at all
Zoom Center
Lets you change the center of the zoom region, and hence of the lower window,
without changing the Zoom Span, when you are in Zero Span.
The Zoom Center value is displayed in the lower left corner of the zoom window
(below the graticule).
Remote Command
[:SENSe]:FREQuency:TZOom:TIME:CENTer <time>
[:SENSe]:FREQuency:TZOom:TIME:CENTer?
Example
:FREQ:TZO:TIME:CENT 500 ms
Dependencies Only appears if the Zoomed Trace window is present
Grayed-out unless in Zero Span. If the command is sent when not in Zero Span, an error is reported
Couplings The center of the lower window is limited by the Sweep Time in the upper window. You cannot move
the zoom region out of the upper window, nor does changing Zoom Center ever change Zoom Sweep
Time. When Zoom Center increases or decreases to a value that causes the zoom region to touch an
edge of the top window, Zoom Center is clipped at that value
Preset 50% of Sweep Time
State Saved Saved in instrument state
Min 50% of Zoom Sweep Time
Max Sweep Time - 50% of Zoom Sweep Time
Annotation Lower left corner of the Zoomed Trace window
488 Spectrum Analyzer Mode User's &Programmer's Reference
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