The Rohde & Schwarz FSW8 is a high-performance signal and spectrum analyzer covering 2 Hz to 8 GHz, delivering exceptional sensitivity and measurement fidelity across demanding RF and microwave applications. Engineers rely on the FSW8 for precise frequency analysis, phase noise characterization, and real-time signal capture in laboratory and field environments. Its touchscreen interface and flat menu structure enable rapid configuration and intuitive navigation through complex measurement routines.
Technical Specifications
Frequency Range
• DC-coupled: 2 Hz to 8 GHz
• AC-coupled: 10 MHz to 8 GHz
• Resolution: 0.01 Hz frequency measurement; 0.001 Hz counter resolution
• Frequency counter accuracy: ±(frequency × reference accuracy + ½ last digit)
Internal Reference Accuracy
Standard oscillator: ±1 × 10–7 per year aging; ±1 × 10–7 temperature drift (0 °C to +50 °C); ±1 × 10–8 initial calibration accuracy.
With R&S FSW-B4 OCXO option: ±3 × 10–8 per year aging; ±1 × 10–9 temperature drift; ±5 × 10–9 initial calibration accuracy.
Resolution Bandwidths (–3 dB)
• 1 Hz to 10 MHz in 1/2/3/5 sequence
• Extended to 20 MHz, 50 MHz, 80 MHz with R&S FSW-B8 option
• Bandwidth uncertainty: < 3 % nominal; shape factor (60 dB:3 dB): < 5
Analysis Bandwidth
Up to 500 MHz analysis bandwidth. Real-time analysis: 160 MHz maximum. Extended options: R&S FSW-B160 (160 MHz), R&S FSW-B320 (320 MHz), R&S FSW-B1200 (1.2 GHz), R&S FSW-B2000 (2 GHz), R&S FSW-B4001 (4 GHz), R&S FSW-B5000 (5 GHz).
Displayed Average Noise Level (DANL)
• 2 GHz: –156 dBm (1 Hz) typical; –159 dBm (1 Hz) with R&S FSW-B13
• 8 GHz: –156 dBm (1 Hz) typical; –169 dBm (1 Hz) with preamplifier (R&S FSW-B24)
• 2 Hz: –120 dBm (1 Hz) typical
• Noise cancellation improves DANL by up to 13 dB; –169 dBm (1 Hz) achievable with cancellation enabled
Phase Noise
• 1 GHz carrier, 10 kHz offset: –137 dBc (1 Hz) typical; < –136 dBc (1 Hz) specification
• 10 GHz carrier, 10 kHz offset: –128 dBc (1 Hz) typical
• SSB phase noise at 1000 MHz, 10 Hz offset: –80 dBc (1 Hz) nominal; –90 dBc (1 Hz) with R&S FSW-B4 option
– Key Features
• Wide dynamic range with selectable resolution bandwidths and configurable analysis bandwidth
• Noise cancellation function providing up to 13 dB improvement
• Optional preamplifier extends sensitivity to –169 dBm at 8 GHz
• High-stability OCXO reference option for demanding frequency accuracy requirements
• User-configurable measurement setup with intuitive touchscreen control
– Typical Applications
Spectrum monitoring, signal characterization, phase noise analysis, frequency counter applications, and wideband signal observation in microwave test environments.
– Compatibility & Integration
Extensive option library supports customized analysis bandwidth, noise performance, and frequency stability requirements across research, development, and production test workflows.
