Agilent Technologies Signal Analyzer N9030a - Manual (Page 578)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
FREQ Channel
come back to the band you were in with the Center Frequency that you had. However, Span is
not an input-dependent parameter, therefore you will bring the span over from the other input.
Therefore, the analyzer comes back with the span from the previous input, limited as necessary
by the current mixer setup.
Preset When a Mode Preset is performed while in External Mixing, the Start frequency of the current
Mode is set to the nominal Min Freq of the lowest harmonic range in the Harmonic Table for the
current mixer setup. Similarly, the Stop frequency of the current Mode is set to the nominal Max
Freq of the highest harmonic range in the Harmonic Table. The Center Freq thus presets to the
point arithmetically equidistant from these two frequencies.
If the current measurement has a limited Span available to it, and cannot achieve the Span
shown in the table (Span=Stop Freq – Start Freq), the analyzer uses the maximum Span the
measurement allows, and still sets the Center Freq to the midpoint of the Start and Stop Freq
values in the Harmonic Table.
When Restore Input/Output Defaults is performed, the mixer presets to the 11970A, whose Start
and Stop frequencies are 26.5 and 40 GHz respectively. The center of these two frequencies is
33.25 GHz.
Therefore, after a Restore Input/Output Defaults, if you go into External Mixing and do a Mode
Preset while in the Spectrum Analyzer Mode, the resulting Center Freq is 33.25 GHz.
State Saved Saved in instrument state.
Min The minimum frequency in the currently selected mixer band + 5 Hz
Max The maximum frequency in the currently selected mixer band – 5 Hz
If the knob or step keys are being used, also depends on the value of the other three
interdependent parameters Span, Start Frequency and Stop Frequency
Initial S/W Revision A.08.01
I/Q Center Freq
SCPI command for specifying the I/Q Center Frequency. This command will set the Center
Frequency to be used when the I/Q input is selected, even if the I/Q input is not the input which
is selected at the time the command is sent. Note that the Center Freq function in the Frequency
menu on the front panel always applies to the currently selected input.
Scope Meas Global
Remote Command [:SENSe]:FREQuency:IQ:CENTer <freq>
[:SENSe]:FREQuency:IQ:CENTer?
Example FREQ:IQ:CENT: 30 MHz
Notes This command is the same in all modes, but the parameter is Measurement Global. So the value
is independent in each mode and common across all the measurements in the mode.
578 Remote Language Compatibility Measurement Application Reference