Keysight x-series Instruction Manual

3 Short-Range Comms & IoT Mode
3.9 Occupied BW Measurement
Instrument Types Value
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
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
which is selected at the time the command is sent. Note that the Center Frequency
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 you return to External Mixing after using 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 is not an input-dependent parameter, so it does not
change. Therefore, the instrument comes back with 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 frequency 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 frequency of the
highest harmonic range in the Harmonic Table. Center Frequency thus presets to the point arithmet-
ically 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 that the
measurement allows, and still sets Center Frequency to the midpoint of the Start Freq 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 the Spectrum Analyzer Mode, the resulting Center Frequency is 33.25GHz
Short Range Comms & IoT Mode User's &Programmer's Reference 1283

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)