Spectrum Analyzers

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Spectrum Analyzer 
From Wikipedia, the free encyclopedia
A spectrum analyzer is a device used to examine the spectral composition of some electrical, acoustic, or optical waveform. Often, it measures the power spectrum.

There are analog and digital spectrum analyzers:

  • An analog spectrum analyzer uses either a variable bandpass filter whose mid-frequency is automatically tuned (shifted, swept) through the range of frequencies of which the spectrum is to be measured or a superheterodyne receiver where the local oscillator is swept through a range of frequencies.
  • A digital spectrum analyzer computes the Fast Fourier transform (FFT), a mathematical process that transforms a waveform into the components of its frequency spectrum.

Some spectrum analyzers (such as Tektronix's family of "real-time spectrum analyzers") use a hybrid technique where the incoming signal is first down-converted to a lower frequency using superheterodyne techniques and then analyzed using FFT techniques.

History of the Spectrum Analyzer
Here is a great links on the history of the Spectrum Analyzer:
'Real' History of Real-Time Spectrum Analyzers: A 50-Year Trip Down Memory Lane

HP also has an insightful historical page:

BRL Test provides full service for:
HP/Agilent New and Used Spectrum Analyzer
Tektronix New and Used Spectrum Analyzer
R&S New and Used Spectrum Analyzer
Anritsu New and Used Spectrum Analyzer
Advantest New and Used Spectrum Analyzer
and more…

HP Spectrum Analyzer Repair website
Spectrum Analyzers, Network Analyzers and Signal Generators Blog - News, Tutorials and more.

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