Keysight N9915-90020 User’s Guide 211
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)FUTURE
SA Mode Settings
different FieldFox receiver frequency bands, so even if the
temperature hasn't changed, an alignment may be required when
one changes the Center frequency.
If a needed alignment cannot be performed, the user is notified
about questionable amplitude
AMPTD?.
—
OFF
Alignments are not performed. The most recent alignment
result is cleared. Only factory corrections are applied to SA Receiver
measurements. Questionable amplitude
AMPTD? is always
displayed.
— Hold The alignment process is stopped, but the last alignment
values are applied to subsequent sweeps.
—
Amptd Align Now An alignment is performed immediately, thus updating
(clearing) any questionable amplitude status. If the Mode was previously
Off, it is changed to Hold.
Amptd? is annotated in the lower left corner of the FieldFox screen when
amplitude alignment is questionable. This is always true when OFF, and is
conditionally true in Auto or Hold when the most recent alignment is deemed
stale.
RF Burst Amplitude Alignment
RF Burst alignment calibrates the circuitry to provide accurate external RF
Burst triggering. Learn more about RF Burst triggering in “Triggering” on
page 197
.
When 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 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 186
.
The alignment process can be disabled. You may want to do this, for example,
if you are analyzing the amplitude stability of a signal.
How to use Burst Alignment settings
These settings do NOT survive a Preset or Mode Preset.
1. Press Cal 5
> Individual Align > Burst Alignment
2. Then choose from the following:
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