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 Performance
• 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.
