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28 Chapter 1
Agilent EXA Signal Analyzer
Frequency and Time
b. Resolution Bandwidth Accuracy can be observed at slower sweep times than auto-coupled
conditions. Normal sweep rates cause the shape of the RBW filter displayed on the analyzer
screen to widen by nominally 6%. This widening declines to 0.6% nominal when the Swp
Time Rules key is set to Accuracy instead of Normal. The true bandwidth, which determines
the response to impulsive signals and noise-like signals, is not affected by the sweep rate.
Description Specification Supplemental information
Analysis Bandwidth
a
a. Analysis bandwidth is the instantaneous bandwidth available about a center frequency over
which the input signal can be digitized for further analysis or processing in the time, fre-
quency, or modulation domain.
Standard 10 MHz
With Option B25 25 MHz
Description Specifications Supplemental Information
Video Bandwidth (VBW)
Range Same as Resolution Bandwidth
range plus wide-open VBW
(labeled 50 MHz)
Accuracy ±6% (nominal)
in swept mode and zero span
a
a. For FFT processing, the selected VBW is used to determine a number of averages for FFT
results. That number is chosen to give roughly equivalent display smoothing to VBW filtering
in a swept measurement. For example, if VBW=0.1 × RBW, four FFTs are averaged to gener-
ate one result.