Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.8 Spurious Emissions Measurement
In general, only appears in instruments whose hardware supports this signal
routing. For example, this tab does not appear in many of the modular instrument
products, including VXT Model M9420A, or UXM.
This tab does appear in VXT Models M9410A/11A/15A/16A and
M9410E/11E/15E/16E, because "Software Preselection" on page 1992 is under this
tab, and VXT Models M9410A/11A/15A/16A and M9410E/11E/15E/16E implement
a version of Software Preselection.
Presel Center
Adjusts the centering of the preselector filter to optimize the amplitude accuracy at
the frequency of the selected marker. If the selected marker is not on when Presel
Center is pressed, the instrument turns on the selected marker, performs a peak
search, and then performs centering on the marker’s center frequency. If the
selected marker is already on and between the start and stop frequencies of the
instrument, the instrument performs the preselector calibration on that marker’s
frequency. If the selected marker is already on, but outside the frequency range
between Start Freq and Stop Freq, the instrument first performs a peak search, and
then performs centering on the marker’s center frequency.
The value displayed on "Preselector Adjust" on page 1979 changes to reflect the
new preselector tuning.
Certain considerations should be observed to ensure proper operation, as detailed
in "Proper Preselector Operation" on page 1388.
Remote Command
[:SENSe]:POWer[:RF]:PCENter
Example
:POW:PCEN
Notes The rules outlined above under the control description apply for the remote command as well as the
key. The result of the command depends on marker position, etc. Any message generated by the
control press is also generated in response to the remote command
Dependencies Does not appear in CXA-m, nor in VXT Models M9410A/11A/15A/16A, M9410E/11E/15E/16E
Grayed-out if the microwave preselector is off
–
If the selected marker’s frequency is below Band 1, an advisory message is generated
“Preselector not used in this frequency range” and no action is taken
–
Grayed-out if entirely in Band 0, that is, if Stop Freq is below about 3.6 GHz Grayed-out if entirely
above 50GHz, that is, if Start Freq is above 50GHz
–
Blanked in models that do not include a preselector, such as Option503. If the remote command
is sent in these instruments, accepted without error, and the query always returns 0
–
Grayed-out in the Spectrogram View
Couplings The active marker position determines where the centering will be attempted
If the instrument is in a measurement such as averaging when centering is initiated, the act of
centering the preselector restarts averaging, but the first average trace will not be taken until the
Spectrum Analyzer Mode User's &Programmer's Reference 1387

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)