For example: Agilent E4440A or Anritsu 68369
Spectrum Analyzer
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Tektronix 494 Overview
The Tektronix 494 P is a fully programmable (HPIB) Spectrum Analyzer, covering the frequency range of 10 kHz to 21 GHz (coax, with built-in mixer) and 18 GHz to 325 GHz using one or more of WM 490 series waveguide mixers (not included).