Advantest R3131A 9 kHz to 3 GHz Spectrum analyzer

The Advantest R3131A is a 9 kHz to 3 GHz spectrum analyzer engineered for general-purpose RF and wireless signal analysis. It delivers a dynamic range up to 133 dB with amplitude measurement capability from +30 dBm to average noise level, making it suitable for PCS and cellular standard characterization. The instrument combines automated measurement functions—including occupied bandwidth, adjacent channel power, and power measurement—with flexible resolution control from 300 Hz to 1 MHz. Frequency reading accuracy tracks ±(frequency reading × frequency reference accuracy + span × span accuracy + 0.15 × resolution bandwidth + 1 kHz), while span accuracy reaches ±3% across 50 kHz to 3 GHz operation. Frequency stability of ±5 ppm at operating temperature and residual FM below 100 Hzp-p/100 ms ensure reliable signal characterization.

– Technical Specifications

Frequency & Stability
• Frequency range: 9 kHz to 3 GHz
• Frequency span: Zero, 10 kHz to 3 GHz or Zero, 50 kHz to 3 GHz
• Span accuracy: ≤±3% (50 kHz ≤ span ≤ 3 GHz), ≤±10% (10 kHz ≤ span < 50 kHz)
• Frequency stability: ±5 ppm at operating temperature; ±2 ppm/year (reference source)
• Residual FM: ≤100 Hzp-p/100 ms at zero span
• Sideband noise: ≤100 dBc/Hz at 20 kHz offset

Amplitude & Dynamic Range
• Measurement range: +30 dBm to average noise level
• Maximum input: +30 dBm, 50 VDC
• Reference level (LOG): -64 dBm to +40 dBm
• Input attenuator: 0 to 50 dB (10 dB steps)
• Dynamic range: Up to 133 dB
• Display range (LOG): 10 dB/div (8 div), 1, 2, 5 dB/div (10 div)

Resolution & Selectivity
• Resolution bandwidth: 300 Hz to 1 MHz (1-3 step)
• Bandwidth accuracy: ≤±20% (1 kHz to 1 MHz), ≤±50% (300 Hz)
• Selectivity: ≤15:1 (1 kHz to 1 MHz), ≤20:1 (300 Hz)
• Video bandwidth: 10 Hz to 1 MHz (1-10 step)

– Key Features

• Automated measurement functions: occupied bandwidth, adjacent channel power, power measurement
• EMC measurement with QP detector
• Built-in antenna correction factor editor
• Limit line editor with Pass/Fail indication (2 lines)
• Frequency counter with 1 Hz to 1 kHz resolution
• Gated sweep measurement support
• Auto Tune and Auto CAL functions
• Compact form factor for lab and field deployment

– Optional Tracking Generator (OPT.74)

• Frequency range: 100 kHz to 3.0 GHz
• Output level: 0 dBm to -59.9 dBm (0.1 dB steps)
• Output level accuracy: ≤±0.5 dB (30 MHz, -10 dBm, 20–30°C)
• Output level flatness: ≤±1.0 dB (100 kHz to 1.0 GHz), ≤±1.5 dB (100 kHz to 3.0 GHz)
• Output spurious (harmonic): ≤-20 dBc at -10 dBm output level

– Typical Applications

PCS and cellular wireless standards characterization; EMC precompliance testing; RF component and filter evaluation; transmitter and receiver measurements; signal presence and modulation analysis.