Agilent Technologies Signal Analyzer N9030a User Manual
Page 582
6 RLC Swept SA Measurement Front-Panel & SCPI Reference
FREQ Channel
settings of Source Numerator, Source Denominator and Power Sweep.
Couplings
In the Spectrum Analyzer, the four parameters Center Freq, Start Freq, Stop Freq and Span are
interdependent, as changing one necessarily affects one or more of the others. The couplings
between Center Freq and Span are detailed under the key descriptions for those keys. These
couplings also affect Start Freq and Stop Freq.
You cannot set Start frequency = Stop frequency. You cannot select zero span by setting Start =
Stop. The instrument will alter the value of the last setting to maintain a minimum value of 10 Hz
for the difference between Start and Stop.
Preset
On Mode Preset, Span & CF preset, and Stop Freq is derived. See
for a table which shows the Stop Freq after Preset for various model and option
numbers).
On a Meas Preset only Span presets, CF does not, so Stop Freq will vary depending on CF.
When a Mode Preset is performed while in External Mixing, the Stop frequency of the current
Mode is set to the nominal Max Freq of the highest harmonic range in the Harmonic Table for
the current mixer setup.
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 sets the Center Freq to the midpoint of the Start and Stop Freq values
in the Harmonic Table. Thus, in this case, the Stop Freq will preset to a frequency above the
preset Center Freq by ½ of the maximum Span.
When Restore Input/Output Defaults is performed, the mixer presets to the 11970A, whose Stop
frequency is 40 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 Stop Freq is 40 GHz.
State Saved
Saved in instrument state
Min
–79.999999999 MHz, unless Source Mode is set to Tracking, in which case it is limited by the
minimum frequency of the Source
If the knob or step keys are being used, depends on the value of the other three interdependent
parameters
While in External Mixing, the minimum Stop Freq you can set is determined by the external
mixing parameters. It will be close to the minimum LO frequency (3.8 GHz if undoubled, 8.6 GHz if
doubled) times the harmonic number, for the lowest harmonic range in the Harmonic Table for
the current mixer setup. It can be queried with the SCPI command :FREQ:STOP? MIN.
Max
Depends on instrument maximum frequency. Note that, if the Source Mode is set to Tracking,
the effective instrument maximum frequency may be limited by the source maximum frequency.
If the knob or step keys are being used, depends on the value of the other three interdependent
parameters.
While in External Mixing, the maximum Stop Freq you can set is determined by the external
mixing parameters. It will be close to the maximum LO frequency (7 GHz if undoubled, 14 GHz if
doubled) times the harmonic number, for the highest harmonic range in the Harmonic Table for
582
Remote Language Compatibility Measurement Application Reference