The Rohde & Schwarz FSL3 is a portable spectrum analyzer engineered for research, development, production, and field service applications. Operating from 9 kHz to 3 GHz, it delivers laboratory-grade performance in a compact form factor. The instrument combines low displayed average noise level (–162 dBm), excellent phase noise characteristics (–103 dBc at 10 kHz offset), and third-order intercept performance (+18 dBm) with a 95 dB dynamic range and measurement uncertainty below 0.2 dB to 3.6 GHz. Its all-digital filter architecture provides shape factors below 2 and resolution bandwidth adjustable from 10 Hz to 10 MHz, while frequency counter resolution reaches 1 Hz with 50 ms measurement time.
Technical Specifications
• Frequency range: 9 kHz to 3 GHz
• Displayed average noise level: –162 dBm (typical)
• Phase noise: –103 dBc (1 Hz) at 10 kHz offset
• Third-order intercept: +18 dBm (typical)
• Dynamic range: 95 dB maximum
• Measurement uncertainty: <0.2 dB (DC to 3.6 GHz), <0.3 dB (DC to 8 GHz)
• Resolution bandwidth: 10 Hz to 10 MHz
• Video bandwidth: 10 Hz to 10 MHz
• Demodulation bandwidth: 28 MHz (standard)
• I/Q demodulation: 20 MHz or 28 MHz bandwidth
• RF attenuator: 5 dB steps
• Trace points: up to 32,001 adjustable
• Frequency counter resolution: 1 Hz (50 ms measurement time)
– Key Features
• Full detector suite: max, min, auto-peak, sample, RMS, average, quasi-peak
• Channel power and adjacent channel power measurement (ACP/Fast ACP) with predefined standards
• Occupied bandwidth, burst power, and carrier-to-noise ratio analysis
• Modulation depth measurement, frequency deviation, and CCDF analysis
• Scalar network analysis capability (with optional tracking generator to 6 GHz)
• Editable limit lines with PASS/FAIL indication
• Direct-access function keys and softkeys for rapid operation
• Optional EMI filters: 200 Hz, 9 kHz, 120 kHz
• Optional FFT filters: 300 Hz to 30 kHz or 1 Hz to 30 kHz
– Typical Applications
Laboratory characterization, field compliance testing, production alignment, service diagnostics, and signal quality assessment in wireless communications and RF systems.
– Compatibility & Integration
Optional tracking generator extends measurement capability to 6 GHz for transmission measurement and network analysis applications.
