3 Spectrum Analyzer Mode
3.9 SEM Measurement
3.9.16.1 Settings
Contains controls that pertain to the X axis parameters of the measurement. These
parameters control how data on the vertical (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. While
adjusting Center Frequency, Span is held constant.
This 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
directly set Center Frequency for a specific input.
Center Frequency is remembered as you go from input to input. Thus you can set a
Center Frequency of 10GHz with the RF Input selected, change to BBIQ and set a
Center Frequency of 20MHz, then switch to External Mixing and set a Center
Frequency of 60GHz. When you go back to the RF Input, Center Frequency returns
to 10GHz; back to BBIQ and it is 20MHz; back to External Mixing and it is 60GHz.
See also:
–
"Center Frequency Presets" on page 1610
–
"VXT Models with Radio Heads/CIU Frequency Range" on page 1612
–
"RF Center Freq" on page 1612
–
"Ext Mix Center Freq" on page 1613
–
"I/Q Center Freq" on page 1614
Remote Command
[:SENSe]:FREQuency:CENTer <freq>
[:SENSe]:FREQuency:CENTer?
Example Set Center Frequency to 50 MHz:
:FREQ:CENT 50 MHz
Increment Center Frequency by the value of "CF Step" on page 1614:
:FREQ:CENT UP
Return the current value of Center Frequency:
Spectrum Analyzer Mode User's &Programmer's Reference 1609
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