RF Measurements > Common Controls for RF
Measurements Displays
Traces Tab
Traces Tab
The Traces tab enables you to select traces for display. You can choose to display live traces and/or
recalled traces. The
for Settling Time displays is described in the Settling Time
controls section.
NOTE.
Not all RF Measurements support multiple traces and/or save and recall of traces.
Setting
Description
Trace
Selects a trace for display. Choices are Trace 1, 2, and Gaussian (CCDF display only).
Trace 1 and 2 can be recalled traces.
Show
Shows / hides the selected trace.
Freeze
Halts updates to the selected trace.
Save Trace As...
Saves the selected trace to a
fi
le for later recall and analysis.
Show recalled trace
Used to select a saved trace for display.
Detection (Phase Noise only)
Sets the Detector used for the trace. Only +/- Peak and Avg (VRMS) are available for the
Phase Noise display. This setting is not available for saved traces. +/-Peak detection
results in a trace with two Y values for each X location, with shading between.
Smoothing (Phase Noise only)
When enabled, diminishes point-to-point trace variations. Smo/- Peak traces
and - lines independently. The smoothing value adjusts how many points are in
each
fi
lter set. Range: 1 - 20; Default: 5.
xxx
Detection
Trace Detection occurs when the trace is being decimated by the measurement. For example, if the
maximum number of trace points is 100,000, and the selected analysis region is 200,000 samples, the
measurement must decimate the 200,000 resulting trace points by 2 to prevent exceeding the 100,000 trace
point limit. Since only one value can be selected for each trace point, an algorithm must be used to select
(detect) the appropriate value to use.
The IQ samples in a data acquisition can be detected in a variety of ways. The number of IQ samples
available to each trace point varies with both analysis length and trace length. For example, with Spectrum
Length set to ‘Auto’ in the Analysis menu, the instrument analyzes just enough samples to produce one
IQ sample pair per trace point. In this case, the detection method chosen has very little effect, as the
+Peak, -Peak, Avg (VRMS) and Sample values are all equal. Changing the Spectrum Length causes the
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