Keysight E6680A - Preselector Adjust

3 IQ Analyzer (Basic) Mode
3.1 Complex Spectrum Measurement
3.
In some models, the preselector can be bypassed. If it is bypassed, no centering
is attempted in that range and a message is generated
Preselector Adjust
Lets you manually adjust the preselector filter frequency to optimize its response to
the signal of interest. Only available when "Presel Center" on page 316 is available.
For general purpose signal analysis, using Presel Center is recommended. Centering
the filter minimizes the impact of long-term preselector drift. Preselector 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.
When Presel Center is performed, the offset applied to do the centering becomes
the new value of Preselector Adjust.
Remote Command
[:SENSe]:POWer[:RF]:PADJust <freq>
[:SENSe]:POWer[:RF]:PADJust?
Example
:POW:PADJ 100KHz
:POW:PADJ?
Notes The value on the control is displayed to 0.1MHz resolution
Dependencies
–
Does not appear in CXA-m
–
Does not appear in VXT Models M9410A/11A/15A/16A
–
Does not appear in M9410E/11E/15E/16E
–
Grayed-out if microwave preselector is off
–
Grayed-out if entirely in Band 0, that is, if Stop Freq is lower than about 3.6 GHz
–
Grayed-out if entirely above 50GHz, that is, if Start Freq is higher than 50GHz
–
Blank in models that do not include a preselector, such as Option503. If the command is sent in
these instruments, it is accepted without error, and the query always returns 0
–
Grayed-out in the Spectrogram View
Preset 0MHz
State Saved The Preselector Adjust value set by "Presel Center" on page 316, or by manually adjusting Preselector
Adjust
Not saved in instrument state, and does not survive a Preset or power cycle
Min/Max –/+500MHz
Backwards
Compatibility SCPI
[:SENSe]:POWer[:RF]:MW:PADJust
[:SENSe]:POWer[:RF]:MMW:PADJust
169 IQ Analyzer Mode User's &Programmer's Reference