The Keysight N9951B FieldFox is a handheld combination analyzer delivering RF and microwave measurements to 44 GHz in a ruggedized, field-portable platform. This 3.4 kg instrument integrates optional spectrum analysis, real-time spectrum analysis, and vector network analysis into a single unit, enabling cable testing, antenna characterization, network analysis, and over-the-air measurements for 5G NR and LTE applications.
Technical Specifications
General Specifications
• Maximum Frequency: 44 GHz
• Weight: 3.4 kg (7.4 lb)
• Operating Temperature: −10 to +55°C
• Ruggedization: Sealed enclosure, IP53 rated, MIL-STD-810G Method 511.5 Procedure I, MIL-PRF-28800F Class 2 compliant
Spectrum Analyzer (Optional)
• Frequency Range: 9 kHz to 44 GHz
• Amplitude Accuracy: ±0.2 dB
• Display Average Noise Level: −163 dBm @ 2 GHz; −154 dBm @ 32 GHz; −142 dBm @ 50 GHz
• Third-Order Intercept: +9.7 dBm @ 2.4 GHz
• Spurious Free Dynamic Range: >104 dB
• Phase Noise: −114 dBc/Hz @ 10 kHz offset (1 GHz carrier)
Real-Time Spectrum Analyzer (Optional)
• Maximum Real-Time Bandwidth: 120 MHz
• Minimum Signal Duration: 5.52 µs (100% probability of intercept at full amplitude accuracy)
• Frequency Range: 5 kHz to 54 GHz
Vector Network Analyzer (Optional)
• Frequency Range: 300 kHz to 44 GHz
• Built-in Ports: 2
• System Dynamic Range: Up to 105 dB (simultaneous four S-parameter measurement)
• Measurement Functions: Full 2-port S-parameters, transmission/reflection, mixed-mode S-parameters, DTF/TDR cable measurements
– Key Features
• Configurable measurement suite via software options
• Water-resistant chassis rated for harsh environmental operation
• Impact-resistant design with sealed enclosure
• Preamplifier option available
• Display options include density, spectrogram, and spectrum views
– Typical Applications
• Field testing and troubleshooting of microwave systems
• Cable and antenna characterization
• Network analysis and fault location
• 5G NR and LTE over-the-air measurements
• Maintenance in contaminated or explosive environments
– Compatibility & Integration
The N9951B accepts optional modules for spectrum analysis (9 kHz–44 GHz), real-time spectrum capture to 54 GHz, and vector network analysis to 44 GHz. Built-in 2-port VNA and optional DTF/TDR capabilities enable transmission line testing.
