Rohde & Schwarz FSEK30 20Hz-40GHz Spectrum Analyzer

The Rohde & Schwarz FSEK30 is a spectrum analyzer covering 20 Hz to 40 GHz for RF signal analysis across research, manufacturing, and compliance applications. It delivers exceptional sensitivity with a displayed noise floor of −150 dBm (typ.) in 10 Hz bandwidth and −174 dBm/Hz at room temperature. The instrument provides 169 dB total dynamic range with 105 dB on-screen capability and 115 dB intermodulation-free dynamic range, enabling detection and characterization of weak signals in complex RF environments.

The FSEK30 features adjustable resolution bandwidth from 1 Hz to 10 MHz in 1/2/3/5/10 steps and supports full-span sweep times of 230 ms with quasi-analog refresh at 25 sweeps/s on its 24 cm/9.5" LC TFT display. A 1 µs zero-span sweep capability and 50 ns sampling rate (20 MHz A/D) enable rapid transient capture and analysis. The third-order intercept point of +20 dBm (typ.) and 1 dB compression point of +10 dBm define its linearity performance for multi-signal environments.

Technical Specifications

• Frequency range: 20 Hz to 40 GHz


• Resolution bandwidth: 1 Hz to 10 MHz, adjustable in 1/2/3/5/10 steps


• Displayed noise floor: −150 dBm (typ.) in 10 Hz bandwidth; −174 dBm/Hz at room temperature


• Third-order intercept point: +20 dBm (typ.)


• 1 dB compression point: +10 dBm


• Dynamic range: 169 dB total; 105 dB on-screen; 115 dB intermodulation-free


• Full-span sweep time: 230 ms (FSEK); zero-span: 1 µs


• Sweep range: 5 ms to 16,000 s (span ≥ 10 Hz)


• Sampling rate: 50 ns (20 MHz A/D converter)


• Display resolution: 500 pixels


• Display: 24 cm/9.5" active LC TFT


• Refresh rate: 25 sweeps/s quasi-analog

Key Features

• Modulation analysis: AM, FM, PM, BPSK, QPSK, π/4-DQPSK, 8PSK, QAM, MSK, GMSK, 2FSK


• Vector signal analyzer option (FSE-B7)


• Gated measurements and burst analysis


• Constellation and eye diagram displays


• Low-noise internal DC sources for VCO characterization


• Temperature stability: 1×10⁻⁹/day with FSE-B4 option (OCXO)

Typical Applications

• Signal characterization and component testing


• EMC compliance validation


• GSM, DECT, and EDGE modulation analysis


• Modulation depth and deviation measurement


• Vector/frequency/phase error assessment

Compatibility & Integration

• Ethernet interface (Option FSE-B16)


• IEEE/IEC interface (Option FSE-B17)


• External mixing capability (Option FSE-B21)


• Broadband output 741.4 MHz (Option FSE-B23)


• FFT filtering 1 Hz to 1 kHz (Option FSE-B5)