The Difference
The ideal analyzer would combine the advantages of both swept-tuned and FFT
analyzers while minimizing the disadvantages. To provide these advantages the
89400 series analyzers use FFT technology to provide wideband and high frequency
measurements as well as narrowband and low frequency measurements. The
nearby figure shows the difference between the modern microprocessor-controlled
swept-tuned analyzer and the 89400 series analyzers. The analog IF section is
replaced by a digital IF section which incorporates FFT technology and digital
signal processing to make very fast measurements.
Vector mode and zoom measurements
The 89400 series analyzers expand FFT technology to perform measurements on
narrow as well as relatively wide spans from baseband to the analyzer’s upper
frequency limits. Earlier FFT analyzers have been limited to narrow spans and low
frequencies. These limitations restricted the ability to measure phase and
to analyze time-variant, transient, and modulated signals. These measurements
often require real-time analysis with a non-zero start frequency and wide frequency
spans. Vector mode provides a single FFT measurement as wide as 7MHz (or 10
MHz in 0-10 MHz receiver mode). The zoom capability of Vector mode allows you
to analyze spans away from DC. You may place a selected narrower span at any
frequency within the analyzer’s frequency range.
What Makes this Analyzer Different?
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