Agilent/Keysight 8561E

The Agilent/Keysight 8561E is a portable RF spectrum analyzer engineered for high-performance signal analysis in field and laboratory environments. This MIL-rugged instrument delivers the measurement capabilities of larger benchtop systems in a compact, transportable package. Synthesized tuning ensures drift-free accuracy across its extended frequency range, making it suitable for demanding RF characterization tasks including adjacent channel power measurement, occupied bandwidth analysis, and time-gated pulsed signal evaluation.

– Technical Specifications

Frequency Coverage
• Internal mixing: 30 Hz to 6.5 GHz
• External mixing: 18 GHz to 325 GHz (12 waveguide bands)

Resolution Bandwidth
• Digital RBW: 1 Hz, 3 Hz, 10 Hz, 30 Hz, 100 Hz
• Analog RBW: 300 Hz to 2 MHz
• Selectable range: 1 Hz to 1 MHz

Sensitivity & Dynamic Range
• Displayed average noise level (DANL): typically -151 dBm
• DANL at 30 Hz: ≤ -90 dBm (1 Hz RBW, 0 dB attenuation)
• Noise floor: -145 dBm/Hz
• Spurious-free dynamic range: more than 100 dB
• Adjacent channel power ratio (ACPR): greater than 70 dB typical

Amplitude Measurement
• Range: -145 dBm to +30 dBm
• 1 dB compression point varies with frequency: -5 dBm to +0 dBm across the band
• Third-order intercept: up to +15 dBm

Phase Noise
• ≤ -97 dBc/Hz at 1 kHz offset
• ≤ -113 dBc/Hz at 10 kHz offset
• ≤ -113 dBc/Hz at 30 kHz offset

Frequency Counter
• Resolution: 1 Hz selectable to 1 MHz
• Accuracy: 135 Hz after 15-minute warmup at 1 GHz
• Timebase aging: 1 × 10⁻⁷ per year

Electrical
• Power: 115 VAC (90–140 Vrms, 3.2 Arms max) or 230 VAC (180–250 Vrms, 1.8 Arms max)
• Dissipation: 180 W maximum

Physical
• Dimensions: 16 × 14 × 10 in
• Weight: 20 kg (44 lbs)

– Key Features

• Time-gated analysis for pulsed RF, TDMA, interleaved, and burst signals
• AM/FM demodulation capability
• Measurement personalities for digital radio and phase noise analysis
• HP-IB interface for remote control and data transfer
• Direct printer and plotter connectivity (HP 3630A, 2225A, 7225A/7440A/7470A/7475A/7550A)

– Typical Applications

• Mobile and cellular signal characterization
• Adjacent channel power and occupied bandwidth measurement
• Pulsed RF and TDMA signal analysis
• Phase noise evaluation
• Field-deployable RF troubleshooting and validation