Keysight x-series Instruction Manual

3 Short-Range Comms & IoT Mode
3.3 LoRa (CSS) Demodulation Measurement
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 1656 changes to reflect the
new preselector tuning.
Certain considerations should be observed to ensure proper operation, as detailed
in "Proper Preselector Operation" on page 349.
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
centering is completed
The offset applied to do the centering appears in "Preselector Adjust" on page 1656
Status Bits/OPC
dependencies
When centering the preselector, *OPC does not return true until the process is complete and a
subsequent measurement has completed, nor are results returned in response to :READ or
:MEASure queries
The Measuring bit remains set (true) while this command is operating, and does not go false until
the subsequent sweep/measurement has completed
Proper Preselector Operation
Certain considerations should be observed to ensure proper operation:
1.
If the selected marker is Off, the instrument turns on a marker, performs a peak
search, and adjusts the preselector using the selected marker’s frequency. It
uses the "highest peak" peak search method unqualified by threshold or
excursion, so that there is no chance of a ‘no peak found’ error. It continues with
that peak, even if it is the peak of just noise. Therefore, for this operation to work
properly, there should be a signal on-screen in a preselected range for the peak
Short Range Comms & IoT Mode User's &Programmer's Reference 349

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)