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Anritsu S331D

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Anritsu S331D

Anritsu S331D Cable and Antenna Analyzer, 25 MHz to 4.0 GHz, with built in DTF.

The Anritsu S331D spectrum analyzer is a wide band, very sensitive receiver. It works on the principle of "super-heterodyne receiver" to convert higher frequencies (normally ranging up to several 10s of GHz) to measurable quantities. The received frequency spectrum is slowly swept through a range of pre-selected frequencies, converting the selected frequency to a measurable DC level (usually logarithmic scale), and displaying the same on the CRT of the Anritsu S331D. The CRT displays received signal strength (y-axis) against frequency ( x-axis).

Some applications for Anritsu S331D Spectrum Analyzers include Site Monitoring: Verify that the frequency and signal strength of your transmitter is accurate. Interference: Before a system is installed you use a Anritsu S331D spectrum analyzer to verify that the frequencies (you plan to use) are not occupied or if the presence of a very strong signal will interfere with your new setup. Interference can be created by a number of different situations. Other tests that utilize the Anritsu S331D spectrum analyzer features include antenna isolation, co-channel interference, adjacent channel power, occupied bandwidth, intermodulation, microwave or satellite antenna alignment, and characterization of components.


  • Accurate return loss/SWR and fault location measurements
  • Accurately tests RF transmission lines and antennas
  • Superior immunity to on-channel interference for testing at co-located antenna sites
  • Multilingual user interface: German, Spanish, French, Chinese, Japanese
  • Insertion Loss/Gain (S251C only)
  • Spectrum analysis (S114C and S332C only)
  • Optional RF power monitor
  • Optional built-in bias tee (S251C only)
  • Synthesizer accurate to 75 ppm
  • Internal memory saves up to 200 traces
  • Instrument configuration up to 10 configurations
  • Alphanumeric trace naming
  • Time, Date stamp
  • Field replaceable battery
  • Segmented limit lines
  • Six markers