The Advantest R3132 offers a frequency span accuracy of 1% or less in frequency ranges of 9 kHz to 3 GHz (R3132/3132N), and 9 kHz to 8 GHz (R3162).
Advantest R3132 9 kHz to 3 GHz Spectrum Analyzer
Advantest R3132 9 kHz to 3 GHz Spectrum Analyzer
Advantest R3132 9 kHz to 3 GHz Spectrum Analyzer