Preselector Adjust - Keysight x-series User Reference Manual

8 Frequency Scan Measurement
AMPTD Y Scale
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
3. In some models, the preselector can be bypassed. If it is bypassed, no centering will be attempted in
that range and a message will be generated.

Preselector Adjust

Allows you to manually adjust the preselector filter frequency to optimize its response to the signal of
interest. This function is only available when
For general purpose signal analysis, using Presel Center is recommended. Centering the filter minimizes
the impact of long-term preselector drift. Presel Adjust can be used instead to manually optimize the
preselector. One application of manual optimization would be to peak the preselector response, which
both optimizes the signal-to-noise ratio and minimizes amplitude variations due to small (short-term)
preselector drifting.
Key Path
Scope
Remote Command
Example
Notes
Dependencies
Preset
State Saved
Min
Max
Default Unit
Backwards
Compatibility SCPI
384
"Presel Center" on page 897
AMPTD Y Scale
Meas Global
[:SENSe]:POWer[:RF]:PADJust <freq>
[:SENSe]:POWer[:RF]:PADJust?
POW:PADJ 100KHz
POW:PADJ?
The value on the key reads out to 0.1 MHz resolution.
• Grayed out if microwave preselector is off. )
• 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.
0 MHz
The Presel Adjust value set by Presel Center, or by manually adjusting Presel Adjust, is not saved in
instrument state, and does not survive a Preset or power cycle.
–500 MHz
500 MHz
Hz
[:SENSe]:POWer[:RF]:MW:PADJust
[:SENSe]:POWer[:RF]:MMW:PADJust
is available.
EMI Receiver Mode Reference