Keysight x-series Instruction Manual

3 Short-Range Comms & IoT Mode
3.8 SEM Measurement
Preset See "Center Frequency Presets" on page 1085 above
State Saved Saved in instrument state
Min -79.999995 MHz
Max See "Center Frequency Presets" on page 1085 above. Basically, instrument maximum frequency - 5
Hz
If the knob or step keys are being used, also depends on Span
Ext Mix Center Freq
Sets the center frequency to use when the External Mixer is selected, even if the
External Mixer input is not the selected input 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: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 (for example,
RF), you will return to the settings that you had when you left External Mixing, so you will return to the
band you were in with the Center Frequency that you had. However, Span is not an input-dependent
parameter, so the Span setting from the other input will be retained. Therefore, the instrument retains
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. Center Frequency thus presets to the point arithmetically
equidistant from these two frequencies
Note that, 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 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 switch to External Mixing and do a 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 Span
Max The maximum frequency in the currently selected mixer band - 5Hz
If the knob or step keys are being used, also depends on Span
1088 Short Range Comms & IoT Mode User's &Programmer's Reference

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)