Keysight N9938-90003 User’s Guide 151
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
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.
Some examples of the conditions when alignments occur are: This
could be a Center frequency change, or it could be as simple as
requesting a Single sweep. Also, unique alignments are required at
different FieldFox receiver frequency bands, so even if the
temperature hasn't changed, an alignment may be required when
one changes the Center frequency.
—Hold
The alignment process is stopped, but the last alignment values
are applied to subsequent sweeps.
— OFF
The alignment process is NOT performed, and the channel
equalization is deactivated.
— ChanEq Align Now
An alignment is performed immediately.
The Amptd? annotation lights up whenever the current channel equalization is
deemed stale.
Detection Method
In SA Mode, the X-axis is comprised of data points, also known as “buckets”.
The number of data points is specified using the Points setting. Learn more in
“Points ” on page 141.
Regardless of how many data points are across the X-axis, each data point
must represent what has occurred over some frequency range and time
interval.
From the frequency span of the measurement, the span of each data point is
calculated as (frequency span / (data points-1)). The detection method allows
you to choose how the measurements in each bucket are displayed.
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