3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
3.2.6 Frequency
Lets you control the Frequency parameters of the instrument.
Some features in the Frequency menu are the same for all measurements in the
current Mode – they do not change as you change measurements. Settings like
these are called “Meas Global” and are unaffected by Meas Preset. For example,
"Center Frequency" on page 281 is the same for all measurements – it does not
change as you change measurements.
3.2.6.1 Settings
Contains controls that pertain to the X-Axis parameters of the measurement. These
parameters control how data on the horizontal (X) axis is displayed and control
instrument settings that affect the horizontal axis.
Center Frequency
Sets the frequency that corresponds to the horizontal center of the graticule (when
frequency Scale Type is set to linear). While adjusting Center Frequency, Span is
held constant, which means that both "Start Freq" on page 292 and "Stop Freq" on
page 294 will change.
Pressing Center Frequency sets the frequency entry mode to Center/Span. In
Center/Span mode, the center frequency and span values are displayed below the
graticule, and the default active function in the Frequency menu is Center
Frequency. In the Start/Stop annotation mode, Start Freq and Stop Freq are
displayed below the graticule instead of Center Frequency and Span.
Pressing Center Frequency also sets the frequency entry mode to Center/Span. In
Center/Span mode, the center frequency and span values are displayed below the
graticule, and the default active function in the Frequency menu is Center
Frequency.
When Display Scale Type is set to LOG, pressing Center Frequency sets the
frequency that corresponds to the arithmetic mean of the start frequency and stop
frequency, which is not at the horizontal center of the graticule.
The center frequency setting is the same for all measurements within a Mode, that
is, it is Meas Global. Some Modes are also able to share a Mode Global center
frequency value. If this is the case, the Mode has a Global tab in its Meas Setup
menu.
Center Frequency sets (and queries) the center frequency for the currently selected
input. If your instrument has multiple inputs, and you select another input, Center
Frequency changes to the value for that input. SCPI commands are available to
Spectrum Analyzer Mode User's &Programmer's Reference 281
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