A spectrum analyzer.


A spectrum analyzer are testing devices used in performing output measurement tests and performance verification on audio and telemetry devices. Mostly, these multifaceted devices performs primary measurement of EMC/EMI, Frequency Range, Bandwidth, Average Noise Level, Sweep Time, and Amplitude tests. Lastly, technicians can store, print data, or possibly transfer it to an automated computerized maintainence management system for archival.


There are analog and digital spectrum analyzers:

  • An analog spectrum analyzer uses either a variable band-pass 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 discrete Fourier transform (DFT), a mathematical process that transforms a waveform into the components of its frequency spectrum.

Some spectrum analyzers (such as "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 fast fourier transformation (FFT) techniques.


  • GAO Tech - 8821



See also

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