The Rohde & Schwarz FSMR50 is a multifunction measuring receiver spanning 20 Hz to 50 GHz, consolidating level calibration, modulation analysis, audio analysis, power metering, and spectrum analysis into a single instrument. Engineers rely on it for precision calibration of signal generators and attenuators, leveraging exceptional level linearity and a dynamic measurement range from +30 dBm to -140 dBm. The instrument supports AM, FM, and PM modulation analysis with measurement uncertainties as low as 0.5% (AM) to 3% (FM), plus integrated THD and SINAD measurements for audio characterization. Its modular architecture permits operation via front panel, GPIB, LAN, or IEC/IEEE bus, with optional YIG preselection for full-featured microwave spectrum analysis.
Technical Specifications
Frequency Range: 20 Hz to 50 GHz
Level Calibration
• Measurement range: +30 dBm to -140 dBm
• Linearity: 0.015 dB + 0.005 dB per 10 dB step
• Accuracy: 0.001 dB + 0.005 per 10 dB
• Measurement bandwidth: 100 Hz to 10 MHz (adjustable)
Modulation Analysis
• AM: 0% to 100% modulation depth, 50 Hz to 100 kHz modulation frequency, 0.5% to 1.5% uncertainty
• FM: Maximum 500 kHz deviation, 50 Hz to 200 kHz modulation frequency, 1% to 3% uncertainty
• PM: Maximum 10,000 radians phase deviation, 50 Hz to 100 kHz modulation frequency, 1% uncertainty
• Distortion across all types: 0.1%
Audio Analysis
• Automatic THD and SINAD measurements
• Lowpass filters: 3 kHz, 15 kHz, 23 kHz, 100 kHz
• Highpass filters: 20 Hz, 50 Hz, 300 Hz
• Deemphasis: 25/50/75/750 µs
• Input impedance: 50 Ω / 1 MΩ; level to 4 V; frequency range 20 Hz to 1 MHz
Power Meter
Supports Rohde & Schwarz NRP power sensors with integrated power splitter and automatic VSWR correction.
Spectrum Analysis
Based on R&S FSU architecture with harmonic and phase noise measurement capability. Optional YIG preselection extends full microwave performance.
Power Consumption: Typical 150 VA
– Interfaces
GPIB, LAN, front panel control across all functions.
