The Keysight/Agilent/HP 3585A is a synthesized spectrum analyzer for signal analysis from 20 Hz to 40 MHz. It delivers frequency accuracy and stability through a synthesized local oscillator, making it suited for research, development, and manufacturing environments. The instrument combines high sensitivity with broad dynamic range exceeding 80 dB (third-order intermodulation), enabling detailed spectral measurements including harmonic distortion analysis, frequency response characterization, and carrier-to-noise ratio assessment. Input levels span -137 dBm to +30 dBm with typical amplitude accuracy of ±1 dB and displayed average noise level of -147 dBm at 1 MHz with 1 Hz resolution bandwidth.
Technical Specifications
Frequency Domain
• Frequency range: 20 Hz to 40 MHz
• Resolution bandwidth: 1 Hz to 300 kHz (1-3-10 sequence, selectable)
• Video bandwidth: 0.1 Hz to 3 kHz (1-3-10 sequence, selectable)
Amplitude Domain
• Input amplitude range: -137 dBm to +30 dBm
• Amplitude accuracy: ±1 dB typical
• Reference level range: -70 dBm to +30 dBm
• Displayed average noise level: -147 dBm typical (1 MHz, 1 Hz RBW)
• Dynamic range: 70 dB (adjacent channel), >80 dB (third-order intermodulation)
• Display: 10 division logarithmic scale, calibrated in dBm, dBV, or V
Hardware
• Local oscillator: Synthesized for high stability
• Input impedance: 50 ohms nominal
• Maximum continuous input: +20 dBm
• RF input connector: Type N female, 50 ohms
• External trigger and reference clock: BNC connectors
• Display: High-resolution CRT
– Key Features
• Synthesized local oscillator ensures superior frequency accuracy across full band
• Selectable resolution and video bandwidths enable optimized measurement sensitivity
• Automated measurements: carrier-to-noise ratio and adjacent channel leakage ratio
• Trace memory with instrument settings storage and recall
• Built-in calibration routines for performance verification
– Typical Applications
• Harmonic and intermodulation distortion product measurement
• Real-time signal monitoring and amplitude tracking
• Component and system frequency response characterization
• Signal quality assessment in manufacturing test
– Compatibility & Integration
IF output available via BNC connector. External synchronization supported through reference clock input/output connectors.
