Agilent Technologies Signal Analyzer N9030a - Manual (Page 573)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
FREQ Channel
Center Freq
Sets the frequency that corresponds to the horizontal center of the graticule (when frequency Scale
Type is set to linear). While adjusting the Center Frequency the Span is held constant, which
means that both Start Frequency and Stop Frequency will change.
Pressing Center Freq 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 Freq.
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 will have a Global Settings key in its Mode Setup menu.
The Center Freq function sets (and queries) the Center Frequency for the currently selected input.
If your analyzer has multiple inputs, and you select another input, the Center Freq changes to the
value for that input. SCPI commands are available to directly set the Center Freq for a specific
input.
Center Freq is remembered as you go from input to input. Thus you can set a Center Freq of 10
GHz with the RF Input selected, change to BBIQ and set a Center Freq of 20 MHz, then switch to
External Mixing and set a Center Freq of 60 GHz, and when you go back to the RF Input the
Center Freq will go back to 10 GHz; back to BBIQ and it is 20 MHz; back to External Mixing and it
is 60 GHz.
See "RF Center Freq" on page 576
See Ext Mix Center Freq
See "I/Q Center Freq" on page 578
See "Center Frequency Presets" on page 574
Key Path FREQ Channel
Scope Meas Global
Remote Command [:SENSe]:FREQuency:CENTer
[:SENSe]:FREQuency:CENTer?
Example FREQ:CENT 50 MHz
FREQ:CENT UP changes the center frequency to 150 MHz if you use FREQ:CENT:STEP 100 MHz
to set the center frequency step size to 100 MHz
FREQ:CENT?
Notes This command sets either the RF or I/Q Center Frequency depending on the selected input.
For RF input it is equivalent to FREQ:RF:CENT
For I/Q input it is equivalent to FREQ:IQ:CENT
Remote Language Compatibility Measurement Application Reference 573