3 Short-Range Comms & IoT Mode
3.10 Spurious Emissions Measurement
Preset See "Center Frequency Presets" on page 1436 above
State Saved Saved in instrument state
Min -79.999995 MHz
Max See "Center Frequency Presets" on page 1436 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
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. Center Frequency thus presets to the point arithmetically
equidistant from these two frequencies
Note that, if the current measurement has a limited span/range available to it, and cannot achieve the
span shown in the table (Range = Stop Freq – Start Freq), the instrument uses the maximum span the
measurement allows, and still sets Center Frequency 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 Restore Input/Output Defaults, if you go to External Mixing and do Mode Preset while in
Spectrum Analyzer Mode, the resulting Center Frequency is 33.25 GHz
State Saved Yes
Min The minimum frequency in the currently selected mixer band +5 Hz
If the knob or step keys are being used, also depends on Range
Max The maximum frequency in the currently selected mixer band –5 Hz
If the knob or step keys are being used, also depends on Range
Short Range Comms & IoT Mode User's &Programmer's Reference 1439
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