The Rohde & Schwarz FMA Modulation Analyzer measures modulated signals across 50 kHz to 1360 MHz with integrated RF counter, power meter, voltmeter, and distortion measurement capabilities. It delivers rapid, precise analysis of AM, FM, and phase modulation schemes across broadcasting, radiotelephony, and signal generator calibration applications.
Technical Specifications
Frequency Coverage
• Base range: 50 kHz to 1360 MHz
• Extended coverage: Up to 5.2 GHz with optional FMA-B12 module
RF Input
• Impedance: 50 Ω
• Connector: N-type
• Overload protection: Up to 5 W (15 V RMS) with 10 dB attenuation
RF Frequency Measurement
• Resolution: 0.1 Hz, 1 Hz, 10 Hz, or 100 Hz (selectable)
• Display: 10-digit readout
• Accuracy example: ±200 Hz at 100 MHz; ±10 Hz within one-year calibration interval (with FMA-B10 option)
Amplitude Modulation (AM)
• Modulation frequency range: 10 Hz to 200 kHz
• Measurement error: <0.5% of reading (minimum 0.001% AM)
• Resolution: 0.1% of reading
Frequency Modulation (FM)
• Modulation frequency range: 10 Hz to 200 kHz
• Maximum measurable deviation: Up to 700 kHz (330 kHz demodulator bandwidth)
• Residual FM: Typically –130 dBc at 1 GHz, 20 kHz offset
• Accuracy: <0.5 Hz residual FM up to 340 MHz
Phase Modulation (φM)
• Modulation frequency: 10 Hz and above (with special φM filter)
• Performance comparable to FM measurements
Power Measurement
• Frequency range: 50 kHz to 1360 MHz
• Range: –37.5 dBm to +30 dBm
• Error: <0.5 dB typical; <0.3 dB guaranteed (FMB model)
Audio/AF Measurements
• Distortion: Down to 0.005% continuous (10 Hz to 100 kHz, optional)
• Voltage: AC/DC measurement with universal filter capability
• Psophometric weighting filters included
Demodulation & Local Oscillator
• AM, FM, φM demodulation with DC-coupled outputs for transient analysis
• Ultra-low-noise synthesizer; typical noise floor –130 dBc at 1 GHz, 20 kHz offset
Signal Conditioning
• Filter options: P53 to CCITT standards; 30 kHz and 120 kHz Bessel lowpass; highpass filters
– Key Features
• Multi-function instrument: RF counter, power meter, voltmeter, distortion analyzer
• High-resolution frequency readout with selectable measurement speed
• Wide modulation frequency coverage for AM/FM/φM analysis
• Excellent residual modulation performance; negligible contribution from local oscillator
• Optional frequency extension to 5.2 GHz
– Typical Applications
• Broadcasting signal analysis and quality assurance
• Radiotelephony performance verification
• Signal generator calibration and validation
• Modulation depth and deviation measurement
• RF transmitter characterization
– Compatibility & Integration
Optional modules expand measurement scope: FMA-B10 enhances frequency accuracy; FMA-B12 extends frequency coverage to 5.2 GHz. Modulation analysis firmware options support specialized φM filtering and distortion measurement down to 0.005%.
