Agilent / Keysight 8561B RF Spectrum Analyzer

The Agilent/Keysight 8561B is a portable RF spectrum analyzer built for signal monitoring, component testing, and EMI diagnostics across a broad frequency range. Operating from 30 Hz to 6.5 GHz with a synthesized local oscillator, it delivers the sensitivity and dynamic range required for demanding RF measurements in field and laboratory environments.

Technical Specifications

• Frequency range: 30 Hz to 6.5 GHz


• Frequency resolution: 1 Hz minimum


• Frequency span: 10 Hz to 6.5 GHz, continuously variable


• Frequency accuracy: ±(Frequency Span × %Span/100 + RBW × %RBW/100 + 2% of center frequency + 1 Hz) Amplitude Characteristics


• Amplitude range: −135 dBm to +30 dBm typical


• Displayed average noise level (DANL): −147 dBm typical at 1 GHz, 10 Hz RBW


• Amplitude accuracy: ±1.0 dB typical (20 MHz to 6.5 GHz, 0 dB attenuation, +10 dBm reference)


• Reference level: −70 dBm to +30 dBm


• Display scaling: 0.01 dB to 10 dB/div logarithmic; 1 µV to 5 V/div linear Resolution and Bandwidth


• Resolution bandwidth (RBW): 10 Hz to 5 MHz in 1-3-10 sequence


• RBW accuracy: ±5%


• Video bandwidth (VBW): 0.1 Hz to 5 MHz in 1-3-10 sequence


• Selectivity: Typically 6 dB bandwidth to 1.5 times indicated RBW Sweep and Trigger


• Sweep time: 20 ms to 100 s (auto or manual)


• Sweep triggers: Free run, single, line, video, external

Key Features

• AM and FM demodulation capability for signal analysis


• 1 Hz frequency resolution for precise center frequency measurement


• Multiple amplitude units: dBm, dBmV, dBuV, V, W, dBW


• External trigger and reference inputs for system integration


• Dual AC power inputs: 100–120 V or 200–240 V at 50/60 Hz

Typical Applications

• Signal monitoring and characterization


• Component and subsystem RF testing


• EMI/RFI diagnostics and compliance measurement


• General-purpose spectrum analysis in laboratory and field settings

Compatibility & Integration

• RF input: Type N female, 50 Ω


• External trigger and reference inputs: BNC connectors


• RS-232 interface for remote control and data transfer


• Optional tracking generator, EMI measurement options, and probe power available


• Operating temperature: 0°C to 50°C