Advantest U3641 9kHz to 3GHz Spectrum Analyzer

The Advantest U3641 is a portable 9 kHz to 3 GHz synthesized spectrum analyzer engineered for field deployment, installation, and maintenance work. Its compact, lightweight design delivers high-precision RF measurements across a broad frequency range with exceptional sensitivity and dynamic range. The instrument operates from three independent power sources

AC mains (100/200 VAC auto-switching), external DC (+10 V to +16 V), or an optional battery pack supporting up to 1.5 hours of continuous operation - making it ideal for applications requiring mobility without compromising measurement accuracy.

Technical Specifications

• Frequency range: 9 kHz to 3 GHz


• Span range: 1 kHz to 3.2 GHz, 0 Hz (Zero Span)


• Span accuracy: ≤ ±5% of span


• Residual FM (zero span): ≤60 Hzp-p/100 ms


• Frequency drift (span ≤10 kHz): <150 Hz/min


• Noise sidebands: ≤-105 dBc at 20 kHz offset, ≤-100 dBc at 10 kHz offset Amplitude Measurement


• Measuring range: +20 dBm to displayed average noise level


• Maximum input level (preamplifier OFF, input attenuator ≥10 dB): +27 dBm; ±50 VDC max


• Displayed average noise level (RBW 1 kHz, VBW 10 Hz, input atten 0 dB, f ≥1 MHz): -117 dBm + 2.7f (GHz) dB (U3641/3641PHS)


• Amplitude accuracy (input atten 10 dB, 100 kHz to 2.7 GHz): ≤ ±1 dB


• Second harmonic distortion: ≤-70 dB (-30 dBm input)


• 2-signal, 3rd-order intermodulation distortion: ≤-70 dB (-30 dBm input)


• Residual responses: ≤-100 dBm, 50 Ω Resolution and Bandwidth


• Resolution bandwidth (3 dB): 1 kHz to 3 MHz (1-3 sequence); optional 100 Hz, 300 Hz


• Bandwidth accuracy: ≤ ±20% (1 kHz to 1 MHz)


• Selectivity: <15:1 (60 dB to 3 dB)


• Video bandwidth: 10 Hz to 3 MHz (1-3 step) Sweep and Display


• Sweep time: 50 ms to 1000 s; zero span 50 µs to 1000 s


• Sweep accuracy: ≤ ±5%


• Trigger modes: FREE RUN, SINGLE, VIDEO, EXT, TV


• Display: 6-inch color TFT LCD with 100 dB dynamic range

Interfaces and Connectivity

• GPIB: IEEE-488.2 compliant


• RS-232: Full serial control capability


• Memory expansion: Two PCMCIA slots (JEIDA-Ver. 4.1/PCMCIA Rel. 2.0)


• External DC input: XLR 4-pin connector, +10 V to +16 V

Key Applications Field installation and commissioning of RF systems, in-service maintenance of wireless infrastructure, portable compliance testing, and remote site troubleshooting where AC power availability is limited.