Pulsed RF > Common Controls for Pulsed RF Displays
Params Tab
Measurement Filter
Three choices are available for the measurement
fi
lter:
No Filter - Max BW
: The widest acquisition bandwidth available is used. The
Bandwidth
setting is
disabled, but shows the value in use.
No Filter
: - This is the default. The Bandwidth control is enabled for you to specify an acquisition
bandwidth.
Gaussian
- The Bandwidth control is enabled for you to specify a value. The instrument uses an
acquisition bandwidth two times wider than the entered value.
Power Threshold to Detect Pulses
Speci
fi
es the minimum power level the trace must exceed to be detected as a pulse. The range for this
setting is: -3 to -70 dBc. The setting resolution is 1 dB. The default value is -10 dB.
Max Number of Pulses
If the Analysis Time contains fewer pulses than speci
fi
ed, the analyzer will measure all the pulse within
the analysis time. If there are more pulses in the Analysis Time, than the speci
fi
ed number, the analyzer
measures the speci
fi
ed number of pulses and ignores the rest. The range for this setting is: 1 - 10000.
The setting resolution is: 1. If this setting is not checked, the analyzer will measure all pulses within the
Analysis Time, up to a maximum of 10000 pulses.
To determine the maximum number of pulses that can be analyzed, use the following equation:
where:
Pulse rate is the number of pulses per second (frequency).
Capacity is a length of time which is displayed on the
Acquire
>
Sampling Parameters
tab.
Note that the maximum number of pulses is affected by several parameters. For example, measurement
bandwidth affects the sample rate. The measurement algorithm also can reduce the maximum number of
pulses that can be analyzed (by increasing the sample rate) based on the characteristics of the signal.
Additionally, when FastFrame is enabled, determining the maximum number of pulses is even more
challenging. In FastFrame mode, the spectrum analyzer samples the signal around events of interest
and ignores the signal between events of interest. Thus, if the instrument is only looking at pulses and
ignoring the signal between pulses, the number of pulses that can be analyzed depends strongly on the
characteristics of the pulse itself (for example, fewer wide pulses can be analyzed than narrow pulses,
all other things being equal).
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RSA6100A Series Real-Time Spectrum Analyzers Help
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