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Common Measurement Functions
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 909
See “Ext Mix Center Freq” on page 910Ext Mix Center Freq
See “I/Q Center Freq” on page 911
See “Center Frequency Presets” on page 907
Key Path: FREQ Channel
Scope: Meas Global
Remote Command: [:SENSe]:FREQuency:CENTer <freq>
[: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
Preset and Max values are dependent on Hardware Options (5xx)
If no terminator (e.g. MHz) is sent the terminator Hz is used. If a terminator
with unit other than Frequency is used, an invalid suffix error message is
generated.