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 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.