Advantest R3261A 9kHz to 2.4GHz Spectrum Analyzer

The Advantest R3261A is a spectrum analyzer delivering precise signal analysis across 9 kHz to 2.6 GHz with 1 Hz frequency resolution and a 120 dB display range. Built on synthesized frequency architecture, it measures amplitude from -130 dBm to +25 dBm with 1 dB total level accuracy and supports switchable resolution bandwidth from 30 Hz to 1 MHz. The instrument combines measurement versatility - adjacent channel leakage power, occupied bandwidth, and field strength analysis - with user-centric design: manual sweep via front panel knob, customizable software keys, AM/FM demodulation with audio output, and trace storage modes.

Reference oscillator stability of ±2×10⁻⁸/day and temperature stability of ±5×10⁻⁸ (0–50°C) ensure long-term measurement integrity. Full GPIB control enables automated measurement routines; RS-232 Option 80 provides alternative remote operation at baud rates 600–19200 bps. Peak list function captures up to eight peaks ranked by frequency or level.

Memory card reader stores setups and measurements. Weighs approximately 15 kg.

Technical Specifications

• Frequency Range: 9 kHz to 2.6 GHz


• Frequency Resolution: 1 Hz (synthesized)


• Amplitude Measuring Range: -130 dBm to +25 dBm


• Display Range: 120 dB


• Resolution Bandwidth (RBW): 30 Hz to 1 MHz (switchable, 1 to 3 steps)


• RBW Accuracy: ≤20%


• Total Level Accuracy: 1 dB


• Frequency Span Accuracy: ±3% of span


• Sweep Time: 50 ms to 1000 s


• Reference Oscillator Stability: ±2×10⁻⁸/day


• Reference Oscillator Accuracy: ±2×10⁻⁷/year


• Temperature Stability (0–50°C): ±5×10⁻⁸

Key Features

• AM/FM demodulator with front panel audio output


• Peak list function (up to eight peaks, sortable by frequency or level)


• Adjacent channel leakage power and occupied bandwidth measurement


• Intermittent signal detection and field strength analysis


• EMC measurement support


• Manual sweep via front panel knob for targeted point measurement


• Marker pause for audio monitoring during panoramic scans


• User-defined software key menus


• CRT monochrome display with trace store modes


• Internal frequency counter (1 Hz resolution)

Compatibility & Integration

• GPIB interface for remote control and automated measurement


• RS-232 interface (Option 80): 600–19200 bps, 7/8-bit data, configurable parity and flow control


• Memory card reader for setup and trace storage


• Internal controller support


• Tracking generator function (select models/options)