The Rohde & Schwarz FSU8 is a high-performance spectrum analyzer covering 20 Hz to 8 GHz, purpose-built for RF signal analysis, component characterization, and EMC investigations. It delivers exceptional sensitivity with displayed average noise levels down to –158 dBm (1 Hz bandwidth) and phase noise performance of –160 dBc (1 Hz) at 10 MHz carrier offset. The instrument combines wide dynamic range, flexible resolution bandwidth options from 1 Hz to 50 MHz, and a comprehensive suite of measurement functions including adjacent channel leakage ratio (ACLR), third order intercept (TOI), and harmonic distortion analysis. Fast sweep capability—2.5 ms in frequency domain and 1 µs zero span—enables rapid signal characterization in development and production workflows. External mixer compatibility expands frequency coverage to 110 GHz and beyond, supporting advanced EMC and component testing scenarios.
Technical Specifications
Frequency Range:
• Basic unit: 20 Hz to 8 GHz
• With external mixers (R&S FS-Z60/-Z75/-Z90/-Z110): up to 110 GHz and above
Sensitivity & Noise Performance:
• Displayed average noise level: –158 dBm (1 Hz bandwidth); –152 dBm at 2 GHz; –148 dBm at 26 GHz
• Phase noise: –160 dBc (1 Hz) at 10 MHz carrier offset; typically –133 dBc (1 Hz) at 10 kHz offset
Linearity & Distortion:
• Third order intercept (TOI): typically +25 dBm
• 1 dB compression point: +13 dBm at 0 dB RF attenuation
• Total measurement uncertainty: < 0.3 dB
• Display linearity: 0.1 dB (0 dB to –70 dB)
Resolution & Video Bandwidth:
• Standard filters: 10 Hz to 50 MHz (1, 2, 3, 5 steps)
• FFT filters: 1 Hz to 30 kHz
• Channel filters: 100 Hz to 5 MHz (39 available)
• EMI filters: 200 Hz, 9 kHz, 120 kHz, 1 MHz
• Video bandwidth: 1 Hz to 10 MHz
Sweep Performance:
• Frequency domain: 2.5 ms
• Time domain (zero span): 1 µs
– Key Features
• RMS detector with 100 dB dynamic range; QP detector
• Adjacent channel power measurement (ACLR typically 77 dB for 3GPP)
• Gated sweep, IF power trigger, transducer factor correction
• Peak list marker, spurious emissions measurement, harmonic distortion analysis
• CCDF and APD measurement functions
• Fast ACP measurement in time domain
– Typical Applications
• RF component testing and characterization
• Wireless signal analysis (GSM/EDGE, Bluetooth, WCDMA/HSDPA, CDMA2000)
• EMC and spurious emissions investigation
• Phase noise and harmonic distortion measurement
• Production quality validation
– Compatibility & Integration
Optional application firmware supports GSM/EDGE, Bluetooth, WCDMA/HSDPA/TD-SCDMA, and CDMA2000/1xEV-DV/1xEV-DO modulation analysis. External mixer modules enable millimeter-wave measurements beyond 8 GHz.
