The Advantest R3681 is a high-performance spectrum analyzer that characterizes RF and microwave signals from 20 Hz to 32 GHz with superior frequency accuracy and exceptional sensitivity. Built for signal monitoring, component testing, and electromagnetic compatibility measurements, it delivers 1 Hz frequency resolution, -145 dBm displayed average noise level (with preamplifier ON), and 75 dB typical dynamic range. The instrument provides comprehensive measurement functions including channel power, adjacent channel power, occupied bandwidth, spurious emission, and harmonic distortion analysis across demanding research, manufacturing, and quality assurance workflows.
Technical Specifications
• Frequency Range: 20 Hz to 32 GHz
• Frequency Resolution: 1 Hz minimum
• Resolution Bandwidth: 1 Hz to 10 MHz (1-3-10 sequence)
• Video Bandwidth: 1 Hz to 3 MHz (1-3-10 sequence)
• Sweep Time: 10 ms to 2000 s
• Displayed Average Noise Level: -145 dBm/Hz (typical, preamplifier ON)
• Phase Noise: -90 dBc/Hz at 10 kHz offset (1 GHz carrier)
• Third Order Intercept: +10 dBm (typical)
• Dynamic Range: 75 dB (typical, 1 MHz span, 30 Hz RBW, 10 Hz VBW)
• Amplitude Accuracy: ±0.5 dB (typical)
• Spurious Response: -60 dBc (typical, 1 GHz, full span)
• Harmonic Distortion: -70 dBc (typical, 1 GHz, -20 dBm carrier)
• Non-harmonic Distortion: -60 dBc (typical, 1 GHz, -20 dBm carrier)
– Key Features
• Built-in measurement functions: channel power, adjacent channel power, occupied bandwidth, three-modulus phase comparator, spurious emission, harmonic distortion
• Multiple trigger modes: positive/negative edge, video, external, frequency, power, list
• Amplitude units: dBm, dBmV, dBµV, V, mV, µV
• RF Input: Type-N (female), 50 ohm
• External trigger and reference clock (10 MHz) via BNC connectors
• High-resolution color LCD display
• Power: 100-240 VAC, 50/60 Hz, 400 VA typical
• Dimensions: 420 × 177 × 450 mm; Weight: 18 kg
– Compatibility & Integration
• GPIB interface (standard)
• Gigabit Ethernet (LAN)
• USB for external storage and control
