144 Keysight N9938-90003 User’s Guide
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
—Press Enter
Alignments
This section contains the following:
— “Overview” on page 144
— “All Alignment and Align All Now” on page 146
— “Individual Alignments” on page 147
Overview
All Alignment or Align All Now corrects for receiver drift over temperature and
time. SA measurement applications monitor changes in internal temperature
and the time since last alignment update and trigger the need for a new
update when the alignment becomes stale. The alignment is deemed stale
after a significant change in temperature or a significant time elapsed from the
last update. The temperature change and time duration necessary to trigger an
alignment update is predetermined in the factory. Until the update is
performed, annotation indicating “questionable amplitude” is displayed
AMPTD?.
When All Alignment is enabled (by default) the FieldFox performs an
alignment process using the internal RF source. Although some sweeps are
delayed, measurement results are never disturbed.
If the Independent Source (tracking generator) is enabled for your
measurement, it will be borrowed to perform the alignment. Again, the
measurement results are not disturbed. Learn about the Independent Source in
“Independent Source/Tracking Generator ” on page 126.
The alignment process can be disabled. You may want to do this, for example,
if you are analyzing the amplitude stability of a signal.
SA and all modes built on its infrastructure require three types of alignments:
— InstAlign Amplitude Alignment
— RF Burst Amplitude Alignment
— Channel Equalization
These are referred to as Individual Align
.
All three or a subset of the individual alignments are required for each specific
mode, depending on the type of measurement supported by it:
SA:
— InstAlign Amplitude Alignment
— RF Burst Amplitude Alignment
RTSA:
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