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N4421B S-Parameter Test Set

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The Keysight N4421B S-parameter test set, combined with 2-port PNA or PNA-L network analyzer and Option 550, offers a complete solution for 4-port measurements.

Please note, this test set is not subject to a calibration test. The test set’s performance characteristics are parameters that the product is expected to meet before it leaves the factory. A functional test can verify proper performance of all microwave components within the test set.


  • Frequency range: 10 MHz to 50 GHz
  • Supports balanced measurement
  • Solid-state switches for fast and reliable measurement
  • Controlled directly by network analyzer when used with PNA/PNA-L option 550
  • Recommended PNA series with option 014: E8364B

Signal Integrity Applications

  • Analyze eye diagram for high bit rates
  • Extract RLCG for differential transmission line modeling
  • Improve design with spatial resolution of 14.4ps
  • Learn more about Physical Layer Test System N1957B