Detection Method - Agilent Technologies N9913A User Manual

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sweeps. If the FieldFox is not sweeping, a single sweep is triggered and
alignment is performed.

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 Resolution setting. Learn how on
page 105.
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.
One bucket showing Positive peak, Sample, and Negative peak Detection methods.
How to set Detection Method
The current Detection method is labeled on the left edge of the screen. When a
method is selected manually, a # precedes the label. For example: # Nrm means
that Normal was selected from the softkeys.
 Press Trace__6
 Then
 Then choose from the following
SA (Spectrum Analyzer) Mode
An alignment is performed once and applied to subsequent
Detector
Displays the most appropriate Detection method based on other
Auto
o
settings. [ # is NOT shown]
Normal [Nrm] Provides a better visual display of random noise than
o
Positive peak and avoids the missed-signal problem of the Sample Mode.
Should the signal both rise and fall within the bucket interval, then the
algorithm classifies the signal as noise. An odd-numbered data point
displays the maximum value encountered during its bucket. An even-
numbered data point displays the minimum value encountered during its
bucket. If the signal is NOT classified as noise (does NOT rise and fall) then
Normal is equivalent to Positive Peak.
Positive Peak [Pk] Displays the maximum value of all the measurements in
o
each bucket. This setting ensures that no signal is missed. However, it is not
a good representation of the random noise in each bucket.
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