Proper Preselector Operation - Keysight x-series User Reference Manual

10 Monitor Spectrum Measurement
AMPTD Y Scale
The value displayed on the Presel Adjust key will change to reflect the new preselector tuning (see
Presel Adjust.
A number of considerations should be observed to ensure proper operation. See
Operation" on page 732.
Key Path
Remote Command
Example
Notes
Dependencies
Couplings
Status Bits/OPC
dependencies
Initial S/W Revision
Modified at S/W Revision

Proper Preselector Operation

A number of considerations should be observed to ensure proper operation:
1. If the selected marker is off, the analyzer will turn on a marker, perform a peak search, and adjust 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 search to find.
2. If the selected marker is already on, the analyzer will attempt the centering at that marker's frequency.
There is no preselector for signals below about 3.6 GHz, therefore if the marker is on a signal below 3.6
GHz, no centering will be attempted and an advisory message generated
732
AMPTD Y Scale
[:SENSe]:POWer[:RF]:PCENter
POW:PCEN
Note that the rules outlined above under the key description apply for the remote command as well
as the key. The result of the command is dependent on marker position, and so forth. Any message
shown by the key press is also shown in response to the remote command.
• Grayed out if the microwave preselector is off. )
• If the selected marker's frequency is below Band 1, advisory message 0.5001 is generated and no
action is taken.
• Grayed out if entirely in Band 0.
• Blank in models that do not include a preselector, such as option 503. If the SCPI is sent in these
instruments, it is accepted without error, and the query always returns 0.
• Grayed out in the Spectrogram View.
The active marker position determines where the centering will be attempted.
If the analyzer s in a measurement such as averaging when centering is initiated, the act of centering
the preselector will restart averaging but the first average trace will not be taken until the centering
is completed.
When centering the preselector, *OPC will not return true until the process is complete and a
subsequent measurement has completed, nor will results be returned to a READ or MEASure
command.
The Measuring bit should remain set while this command is operating and should not go false until
the subsequent sweep/measurement has completed.
Prior to A.02.00
A.03.00
"Proper Preselector
EMI Receiver Mode Reference