Special Considerations In Vector Mode - Agilent Technologies 89410A Operator's Manual

Fundamental Measurement Interactions

Special Considerations in Vector Mode

Related parameters
The characteristic time/resolution bandwidth relationship for the 89400 series
analyzers is a natural part of the FFT process and is common to all FFT analyzers,
not just this one. However, the 89400 series analyzer is unique in allowing you to
change span and resolution bandwidth independently.
The arrows indicate inversely related parameters.
Topics later in this chapter discuss these relationships in more detail but the most
important implictions are:
l
Resolution bandwidth changes always affect time length for a given window.
l
Time length changes always affect resolution bandwidth.
l
Span changes always affect ∆t.
l
∆t is related to sample rate and is not user-accessible—it is only affected by
changing span.
l
Span and resolution bandwidth may be adjusted independently.
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