3 Short-Range Comms & IoT Mode
3.10 Spurious Emissions Measurement
RF Center Freq
Specifies the RF Center Frequency. Sets the center frequency to use when the RF
input is selected, even if the RF input is not the input that is selected at the time the
command is sent. Note that Center Frequency in the Frequency menu on the front
panel always applies to the currently selected input.
Remote Command
[:SENSe]:FREQuency:RF:CENTer <freq>
[:SENSe]:FREQuency:RF:CENTer?
Example
:FREQ:RF:CENT 30 MHz
: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. If the equivalent SCPI
command is sent, this same message is generated as part of a “-221, Settings conflict” warning
Preset See "Center Frequency Presets" on page 1413 above
State Saved Saved in instrument state
Min -79.999995 MHz
Max See "Center Frequency Presets" on page 1413 above. Basically, instrument maximum frequency –5
Hz
If the knob or step keys are being used, also depends on span (see "Range Settings" on page 1431)
Ext Mix Center Freq
Specifies the External Mixer Center Frequency. Sets the center frequency to use
when the External Mixer is selected, even if the External Mixer input is not the input
that is selected at the time the command is sent. Note Center Frequency 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 switched to one of the other inputs (for example, RF),
you return to the settings that you had when you left External Mixing. So, you return to the band you
were in with the Center Frequency that you had. However, span ("Range" on page 1430) is not an input-
dependent parameter, so the instrument returns to the span from the previous input, limited as
necessary by the current mixer setup
Preset When 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
Short Range Comms & IoT Mode User's &Programmer's Reference 1415
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