The Rohde & Schwarz FSU3 is a high-performance spectrum analyzer for RF analysis in research, development, and production environments. It spans DC to 3.6 GHz (AC coupled from 1 MHz) with 0.01 Hz frequency resolution and delivers noise floors down to -152 dBm at 2 GHz with optional preamplification. The FSU3 combines wide dynamic range, selectable resolution bandwidth from 1 Hz to 50 MHz, and a full suite of measurement functions including ACLR, harmonic distortion, spurious emissions, and phase-noise analysis. Its TOI exceeds +20 dBm (typical +25 dBm) and 1 dB compression point sits at +13 dBm, supporting demanding adjacent-channel and interference characterization tasks. Frequency stability is supported via internal OCXO (1 × 10–9 aging/day) or optional low-drift reference, with external 1 MHz to 20 MHz input capability. The instrument integrates 39 channel filters, RRC filters for NADC and TETRA standards, EMI filters, and configurable detector selection for diverse signal types. Peak-list markers, time-domain power measurement, CCDF analysis, and scalar network analysis round out its measurement portfolio, enabling efficient characterization across communications, EMC, and general RF verification workflows.
Technical Specifications
• Frequency Range: 20 Hz to 3.6 GHz (DC coupled); 1 MHz to 3.6 GHz (AC coupled)
• Frequency Resolution: 0.01 Hz
• Frequency Counter Resolution: 0.1 Hz to 10 kHz, selectable
• Resolution Bandwidth: 1 Hz to 50 MHz (standard); 1 Hz to 30 kHz (FFT); 200 Hz, 9 kHz, 120 kHz, 1 MHz (EMI)
• Video Bandwidth: 1 Hz to 10 MHz
• DANL: -152 dBm at 2 GHz (with R&S FSU-B25); -168 dBm at 20 GHz (with R&S FSU-B24), both at 1 Hz bandwidth
• Third Order Intercept: Typical +25 dBm
• 1 dB Compression Point: +13 dBm (0 dB RF attenuation)
• Phase Noise: Typical -160 dBc (1 Hz) at 10 MHz carrier offset
• Adjacent Channel Leakage Ratio: Typical 77 dB (3GPP); 84 dB with noise correction
• Attenuation Range: 100 dB (RBW = 1 kHz, f > 10 MHz)
• Reference Frequency Stability: Internal OCXO: 1 × 10–9 aging/day, 1 × 10–7 aging/year, 8 × 10–8 temperature drift; optional R&S FSU-B4: 2 × 10–10 aging/day, 3 × 10–8 aging/year, 1 × 10–9 temperature drift
• External Reference: 1 MHz to 20 MHz input (1 Hz steps)
– Key Features
• Full detector selection for signal characterization
• Harmonic distortion and spurious emissions measurement
• Power measurement and frequency deviation analysis
• CCDF and time-domain power functions
• 39 channel filters (100 Hz to 5 MHz bandwidths)
• RRC filters for NADC and TETRA standards
• TOI and noise/phase-noise markers
• Scalar network analysis with 100 dB dynamic range
– Typical Applications
• RF component and system characterization
• EMC and spurious emissions testing
• Adjacent-channel power and interference analysis
• Phase-noise and harmonic distortion assessment
• Multicarrier signal verification
– Compatibility & Integration
Optional preamplifier modules (R&S FSU-B25, R&S FSU-B24) extend dynamic range. External frequency reference from 1 MHz to 20 MHz supports synchronized measurement networks.
