The Advantest R3361CN is a synthesized spectrum analyzer delivering signal analysis from 9 kHz to 2.6 GHz with 1 Hz center frequency resolution. It measures amplitude across a 115 dB display range (−130 dBm to +25 dBm) with 1 dB typical total level accuracy and ±0.3 dB reference level accuracy. Resolution bandwidth spans 30 Hz to 1 MHz in 1 to 3 switchable steps, with selectivity rated at ≤15:1 (60 dB:3 dB). The instrument incorporates an internal tracking generator outputting 0 to −50 dBm (or 0 to −59 dBm in 1 dB steps) with ±0.5 dB typical accuracy and ≤0.7 dB flatness across 100 kHz to 1.0 GHz. Sweep times range from 50 ms to 1000 s at ±3% accuracy across FREE RUN, LINE, and manual modes. Frequency stability reaches ±2×10⁻⁸/day with drift ≤300 Hz/min after 1 hour warm-up. Sideband noise measures ≤−105 dBc/Hz at 20 kHz offset. The compact design includes a CRT monochrome display with dual trace capability (screens A and B), AM-FM demodulation, and occupied bandwidth plus adjacent channel leakage power measurement functions. Multi-marker functionality and GPIB (IEC625/IEEE488) interface support field and laboratory deployment.
Technical Specifications
Frequency
• Range: 9 kHz to 2.6 GHz
• Center frequency resolution: 1 Hz
• Start/Stop frequency setting supported
Amplitude
• Measuring range: −130 dBm to +25 dBm
• Display range: 115 dB
• Total level accuracy: 1 dB (typical)
• Reference level accuracy: ±0.3 dB (typical)
• Maximum input level: +132 dB (with input attenuator ≥30 dB)
Resolution Bandwidth
• Range: 30 Hz to 1 MHz
• Switchable in 1 to 3 steps
• Switching accuracy: <10 dB after automatic calibration
Selectivity
• Rating: ≤15:1 (60 dB:3 dB)
Sweep
• Time range: 50 ms to 1000 s
• Accuracy: ±3% (approximate)
• Modes: FREE RUN, LINE, manual
Tracking Generator
• Output level: 0 to −50 dBm or 0 to −59 dBm (1 dB steps)
• Output accuracy: ±0.5 dB at 30 MHz, −10 dBm, 20–30°C
• Output flatness: ≤0.7 dB (100 kHz to 1.0 GHz); ≤1.5 dB (100 kHz to 2.6 GHz)
Frequency Stability
• Drift: ≤300 Hz/min (after 1 hour warm-up)
• Reference oscillator: ±2×10⁻⁸/day, ±2×10⁻⁷/year
• Temperature coefficient: ±5×10⁻⁸ (0–50°C, referenced to +25°C)
• Residual FM: ≤20 Hz (Vpp) for 0.1 s (span <2 MHz)
Noise
• Sideband noise: ≤−105 dBc/Hz (20 kHz offset, f ≤3.0 GHz)
Demodulation
• Type: AM-FM
Display
• Type: CRT monochrome
• Dual-trace capability (screens A and B)
– Key Features
• Occupied bandwidth measurement
• Adjacent channel leakage power measurement
• Multi-marker function
• Internal tracking generator for frequency characteristic measurement
– Interfaces & Integration
• GPIB standard (IEC625 bus, IEEE488)
• RS-232 available (Option 80)
• IC memory card for external storage
– Typical Applications
RF and microwave signal characterization, component testing, frequency response analysis, and field measurements benefiting from compact, portable design.
