3 WLAN Mode
3.6 Modulation Analysis Measurement
:FREQ:RF:CENT?
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
Dependencies If the electronic/soft attenuator is enabled, any attempt to set Center Frequency such that the Stop
Frequency would be >3.6 GHz fails and results in an advisory message. Forceful -221.1100 If the
equivalent SCPI command is sent, this same message is generated as part of a “-221, Settings
conflict” warning
If Source Mode is set to Tracking, and the Max or Min Center Freq is therefore limited by the limits of
the source, a warning message is generated -222.2001, “Data out of range; clipped to source
max/min” if these limits are exceeded. Note that for an external source, these limits can be affected by
the settings of Source Numerator, Source Denominator, and Power Sweep
Preset See table above
State Saved Saved in instrument state
Min -79.999995 MHz, unless Source Mode is set to Tracking, in which case it is limited by the minimum
frequency of the Source
Max See table above. Basically, instrument maximum frequency - 5 Hz. 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, also depends on the value of the other three interdependent
parameters Span, Start Frequency and Stop Frequency
Ext Mix Center Freq
SCPI command for specifying the External Mixer Center Frequency. This command
will set the Center Frequency to be used when the External Mixer is selected, even if
the External Mixer 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.
Remote
Command
[:SENSe]:FREQuency:EMIXer:CENTer <freq>
[:SENSe]:FREQuency:EMIXer:CENTer?
Example
:FREQ:EMIX:CENT 60 GHz
:FREQ:EMIX:CENT?
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
Couplings When returning to External Mixing after having been switched to one of the other inputs (e.g., RF), you
will come back into the settings that you had when you left External Mixing. So, you will 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
WLAN Mode User's &Programmer's Reference 954
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