Presel Center - Keysight x-series User Reference Manual

Presel Center

When this key is pressed, the centering of the preselector filter is adjusted 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 analyzer will turn on the selected marker, perform a peak search, and then perform centering
on the marker's center frequency. If the selected marker is already on and between the start and stop
frequencies of the analyzer, the analyzer 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 analyzer will first perform a peak search, and then perform centering on the marker's center frequency.
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 383.
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:
EMI Receiver Mode Reference
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
8 Frequency Scan Measurement
AMPTD Y Scale
"Proper Preselector
383