Subject to Export Control, see Cover Page for details. 4-3
4-3. SPECTRUM ANALYZER OPTION (35000010)
The Spectrum Analyzer Option (35000010) adds a Spectrum Analyzer to the testing compatibilities of
the 3500 / 3500A.
The Spectrum Analyzer provides users with the ability to view and measure RF.
The 3500 / 3500A Spectrum Analyzer is a FFT Spectrum Analyzer. The FFT Spectrum Analyzer
operates differently then a swept IF Spectrum Analyzer.
In swept IF Spectrum Analyzers the RBW is defined by analog filters. On many communications test
sets, 300 z is as small as possible, with the more narrow the filter the longer the incoming signal
takes to stabilize in the filter. The number of possible positions that the filter can be moved to are
called “bins.”
The FFT Spectrum Analyzer takes the RBW and uses this same concept to the extreme, with 1024
bins on every sweep. The large number of FFT bins increases the measurement sensitivity.
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