Advantest U4342 – RF Field Analyzer

The Advantest U4342 is a portable RF field analyzer designed for on-site spectrum analysis, signal monitoring, and interference detection across the 9 kHz to 2.2 GHz band. Built-in tracking generator capability (100 kHz to 2.2 GHz) enables direct frequency response measurement of filters and amplifiers, while integrated EMI measurement functions support quasi-peak detection and EMC filtering. The instrument combines a 100 dB dynamic range with a 6-inch TFT color LCD display, 20 dB switchable preamplifier, and multiple power options - 100/230 V AC line, +10 to +16 V DC external, or optional battery pack (1.5–2 hours operation) - delivering true field portability at 6.8 kg.

Technical Specifications

• Frequency Range: 9 kHz to 2.2 GHz


• Tracking Generator: 100 kHz to 2.2 GHz


• Input Impedance: 50 Ω (U4342) or 75 Ω (U4342N)


• Display: 6-inch TFT color LCD


• Dynamic Range: 100 dB


• Preamplifier: Internal, 20 dB gain (switchable)


• Sweep Time: 50 ms to 1000 s (manual); 4.5 ms to 1000 s (trigger mode, ZERO span)


• Weight: Approximately 6.8 kg (without battery pack)


• Battery Runtime: 1.5 to 2 hours; charging time ≈1 hour


• Power Options: 100/230 V AC, +10 to +16 V DC external, or optional battery pack

Key Features

• Spectrum analysis with adjacent channel power, occupied bandwidth, and channel power measurement functions


• Signal monitoring with real-time interference detection and localization


• EMI measurements using quasi-peak detector and EMC filters


• Frequency characteristics evaluation via tracking generator for return loss and impedance matching assessment


• TDMA-TDD waveform observation with PHS-ID demodulator; 625 µs burst detection at 4.5 ms sweep time


• TV picture/sound demodulation with simultaneous spectrum and video display


• AM and FM demodulation; five trigger modes (FREE RUN, SINGLE, VIDEO, EXT, TV)


• Reduced dB measurement function (standard)


• Two PCMCIA slots (JEIDA Ver. 4.1/PCMCIA Rel. 2.0) for settings and data storage


• Audio output via speaker and phone jack with volume control


• ±15 degree display tilt mechanism


• Shoulder strap attachment for field mobility

Typical Applications

• RF interference survey and source identification


• EMI compliance measurement and troubleshooting


• Filter and amplifier frequency response characterization


• Broadcast and CATV signal monitoring


• Cellular and burst-mode signal analysis

Compatibility & Integration PCMCIA memory card slots support optional SRAM cards for extended data storage. External DC power (10–16 V) enables integration into vehicle and portable power systems. Directional coupler compatibility allows impedance and return loss analysis.