The Agilent/Keysight 3585A is a synthesized spectrum analyzer engineered for precise baseband signal analysis from 20 Hz to 40.1 MHz. It delivers 80 dB spurious-free dynamic range and amplitude accuracy of ±0.4 dB across a measurement span of -137 dBm to +30 dBm (50/75 Ω input). The instrument combines fine frequency resolution, selectable input impedance, and integrated tracking generator capabilities for demanding applications in voice, picture, and digital information processing.
Technical Specifications
Frequency Coverage & Resolution
• Operating range: 20 Hz to 40.1 MHz
• Displayed span: 0 Hz to 40.1 MHz variable with 0.1 Hz resolution
• Span selection: 1, 2, 5 step increments from 10 Hz to 40 MHz
• Frequency accuracy: ±0% to +0.2% of span setting
Resolution Bandwidths
• Selectable range: 3 Hz to 30 kHz in 1, 3, 10 sequence
• Minimum: 3 Hz
• Selectivity: 60 dB/3 dB < 11:1
Amplitude Performance
• Measurement range (50/75 Ω): -137 dBm to +30 dBm
• Measurement range (1 MΩ): -31 Vrms to +7.08 Vrms
• Amplitude accuracy: ±0.4 dB
• Dynamic range (spurious-free): 80 dB
• Input attenuation: -25 dBm to +30 dBm manually adjustable in 5 dB steps
Input Impedance
• Selectable: 50 Ω, 75 Ω, 1 MΩ
• 1 MΩ input capacitance: <30 pF
Tracking Generator
• Output level: 0 dBm to -11 dBm
• Frequency accuracy: ±1 Hz relative to analyzer tuning
• Frequency response: ±0.7 dB
• Output impedance: 50 Ω
Display & Control
• 1001 x 1024 digital storage CRT display
• Fully synthesized tuning with phase-continuous local oscillator
• Microprocessor-controlled keyboard entry
• Autoranging input attenuator
• Narrowband frequency counter: 0.1 Hz resolution
Interfaces & Power
• HP-IB interface
• 115 V (+11% −25%), 48–440 Hz or 230 V (+11% −18%), 48–66 Hz
• 180 VA, 3 A maximum
• Weight: 39.9 kg
• Dimensions: 229 mm (H) × 426 mm (W) × 635 mm (D)
– Key Features
• Phase-continuous local oscillator ensures frequency stability across the baseband range
• Fine 0.1 Hz frequency resolution for narrowband signal characterization
• Dual-channel impedance switching (50/75 Ω) without instrument reconfiguration
• Network analysis capability using amplitude-only tracking generator
• Autoranging input attenuator reduces manual tuning overhead
– Typical Applications
• Baseband signal integrity measurement in communications systems
• Audio and video signal analysis
• Digital information processing signal characterization
• Network frequency response measurement
– Compatibility & Integration
HP-IB interface enables remote instrument control and automated measurement sequences in established test environments.
