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904
Common Measurement Functions
FREQ Channel
Zoom Center
Zoom Center appears as the top key in the Frequency menu in the Trace Zoom View of the Spectrum
Analyzer Mode.
Zoom Center allows you to change the frequency of the zoom region, and hence of the lower window,
without changing the Zoom Span.
The
Zoom Center value is displayed in the lower left corner of the zoom window (below the graticule)
when the frequency entry mode is Center/Span (pressing Center Freq or Span sets the frequency entry
mode to Center/Span). When the frequency entry mode is Start/Stop,
Zoom Start is displayed in this
lower left annotation position (pressing Start Freq or Stop Freq sets the frequency entry mode to
Start/Stop).
Dependencies: Auto Tune is not available (grayed out) when Source Mode=Tracking.
Initial S/W Revision: Prior to A.02.00
Key Path:
FREQ Channel
Remote Command: [:SENSe]:FREQuency:TZOom:CENTer <frequency>
[:SENSe]:FREQuency:TZOom CENTer?
Example: FREQ:TZO:CENT 20 MHz
Dependencies: Only appears in the
Trace Zoom View of the Swept SA measurement. If the
SCPI command is sent in other Views, an error is reported.
Couplings: • The center frequency for the lower window is limited by the start and stop
frequencies in the upper window. You cannot move the zoom region out of
the upper window, nor does changing the Zoom Center frequency ever
change the Zoom Span. When Zoom Center increases or decreases to a
value that causes the zoom region to touch an edge of the top window, the
Zoom Center is clipped at that value. If the analyzer Start and/or Stop
frequencies change such that the Zoom Region is no longer between them,
the Zoom Region is moved to the far left or right of the top window as
appropriate.
• Affected by Freq Offset exactly the same as is Center Frequency.
Preset: On entry to Trace Zoom, the Zoom Center frequency is the same as the
analyzer Center Frequency. So if you do a Mode Preset and then immediately
go into Trace Zoom, Zoom Center matches the Preset values listed in the table
under the Center Freq key description.
State Saved: Saved in instrument state
Min: Start Frequency of top window
Max: The maximum Zoom Center frequency is the same as the maximum analyzer
Center Frequency, which is basically the instrument maximum frequency – 5
Hz. See the table under the Center Freq key description.
Default Unit: Hz