Advantest R4131E

The Advantest R4131E is a spectrum analyzer designed for signal analysis from 9 kHz to 3.6 GHz. It delivers -140 dBm displayed average noise level and ±1.0 dB amplitude accuracy, making it suitable for EMI measurements, component testing, and signal monitoring in laboratory and field environments. The instrument combines flexible resolution bandwidth control (10 Hz to 3 MHz), wide amplitude range (-140 dBm to +30 dBm), and low local oscillator phase noise (-100 dBc/Hz at 10 kHz offset) with straightforward operation.

Technical Specifications

• Frequency range: 9 kHz to 3.6 GHz


• Resolution bandwidth: 10 Hz to 3 MHz (1-3 sequence)


• Video bandwidth: 1 Hz to 3 MHz (1-3 sequence)


• Frequency span: 10 Hz to 3.6 GHz


• Frequency accuracy: ±1 × 10⁻⁶ ppm (crystal oven stabilized) Amplitude Domain


• Amplitude range: -140 dBm to +30 dBm


• Reference level: -80 dBm to +30 dBm


• Amplitude accuracy: ±1.0 dB (typical, 25°C, 0 dB attenuation)


• Displayed average noise level: -140 dBm (10 Hz RBW, 10 Hz VBW, preamplifier off)


• Input attenuation: 0 dB to 70 dB, 1 dB steps


• Maximum input: +30 dBm (0 dB attenuation); +20 dBm (≥10 dB attenuation)


• Spurious response: -70 dBc or better (1 GHz, +10 dBm input)


• Third-order intermodulation: -70 dBc or better (1 GHz, -20 dBm per tone) Performance


• Local oscillator phase noise: -100 dBc/Hz (10 kHz offset, 1 GHz)


• Sweep time: 50 ms to 2000 s


• Triggering modes: Free run, video, external, line

Key Features

• Average power, channel power, and adjacent channel power measurements


• Occupied bandwidth and noise analysis


• Carrier-to-noise ratio and phase jitter measurement


• IEEE-488.2 GPIB interface for system integration


• Type-N RF input connector (50 Ω)


• External trigger and reference clock outputs

Electrical & Physical

• Power: 100–240 V AC, 50/60 Hz, ~80 VA consumption


• Dimensions: 420 × 177 × 450 mm; 17 kg


• Operating temperature: 5°C to 35°C


• Storage temperature: -20°C to 60°C

Compatibility & Integration IEEE-488.2 GPIB connectivity enables integration with data acquisition and control systems. Centronics printer/plotter interface supports documentation of measurements.