Advantest R4131C – 10kHz to 3.5GHz Spectrum Analyzer

The Advantest R4131C is a 10 kHz to 3.5 GHz spectrum analyzer engineered for precise signal magnitude measurement and spectral content analysis. Microcomputer control and a 5.5-inch CRT display deliver intuitive operation across RF and microwave applications. This instrument resolves signal composition with 1 Hz to 1 MHz bandwidth selectivity and achieves -116 dBm sensitivity, enabling detection of weak signals in complex electromagnetic environments.

Technical Specifications

• Frequency Range: 10 kHz to 3.5 GHz


• Frequency Span: 50 kHz to 4 GHz


• Resolution Bandwidth: 1 Hz to 1 MHz


• Center Frequency Resolution: 1 kHz maximum


• Center Frequency Accuracy: ±10 MHz (after zero calibration at local feed through)


• Input Sensitivity: -116 dBm (displayed average noise level)


• Dynamic Range: 70 dB


• Skirt Characteristics: -80 dBc or better


• Input Impedance: 50 Ohm


• Frequency Stability: 100 kHz per 5 minutes


• Amplitude Resolution by Marker: 0.05 dB


• Calibration Output Signal: 200 MHz


• Weight: 10 kg

Key Features

• AUTO Configuration: Automatically optimizes resolution bandwidth, sweep time, and input attenuator settings


• SAVE/RECALL: Stores and recalls up to three measurement conditions and waveforms


• Auto-Recall on Power-On: Restores previously configured measurement parameters


• Quasi-Peak Measurement: Supports QP value detection for EMI/EMC testing


• Field Strength Measurement: Quantifies signal strength in dBu/m


• Waveform Memory: Captures and compares multiple measurement traces

Typical Applications Signal analysis across telecommunications, RF component testing, EMI/EMC characterization, and laboratory measurement.

Compatibility & Integration

• GPIB Interface: Standard connectivity for automated measurement systems


• Video Output: Enables external display and system integration


• Probe Connector: 4-pin configuration


• Operating Environment: 0°C to 50°C, less than 85% RH; horizontal orientation required with 10 cm minimum clearance around cooling vents