The Keysight 5087A is a modular distribution amplifier that delivers multiple stable, low-distortion signal outputs from high-performance frequency standards. It accepts inputs at 10 MHz, 5 MHz, 1 MHz, or 100 kHz—in any combination across up to three input channels—and distributes them to as many as 12 individually configurable outputs. Each output level adjusts independently from 0 Vrms to 3 Vrms into 50 ohms, making the unit ideal for metrology, calibration, and precision timekeeping systems where signal integrity and channel isolation are critical.
Technical Specifications
Input Characteristics
• Up to three input channels
• Supported frequencies: 10 MHz, 5 MHz, 1 MHz, 100 kHz (any combination)
• Input level: 0.3 to 3.0 Vrms into 50 ohms
• Optional input preamplifiers and dividers available
Output Characteristics
• Up to 12 total outputs, configurable per channel
• Output level range: 0 to 3 Vrms into 50 ohms (individually adjustable)
• Standard configurations support 5 MHz, 1 MHz, and 100 kHz distribution
Isolation & Signal Rejection
• Amplitude isolation: 0.1% change due to load on other channels
• Phase isolation: <0.1 ns (5 and 10 MHz), <0.5 ns (1 MHz), 60 dB (non-10 MHz outputs), >50 dB (10 MHz output)
Harmonic & Non-Harmonic Distortion
• Harmonic distortion: >40 dB below rated output (80 dB at 100 kHz, 1 MHz, 5 MHz; 70 dB at 10 MHz)
• Non-harmonic distortion: >80 dB below rated output (100 kHz, 1 MHz, 5 MHz); >70 dB (10 MHz)
Stability
• SSB phase noise (5 MHz): >145 dB below signal in 1 Hz BW (>1 kHz from carrier)
• Short-term stability degradation: <1 × 10⁻¹² in 10 kHz band (1 s average)
• Phase stability: <0.1 ns/°C (5 and 10 MHz), <0.5 ns/°C (1 MHz), <5 ns/°C (100 kHz)
• Amplitude stability: ±0.5 dB (0° to 50°C)
Power Requirements
• AC input: 115 or 230 VAC ±10%, 48 to 440 Hz, 20 VA max
• DC input: 22 to 30 VDC, 600 mA max
– Key Features
• Shielded construction minimizes noise and crosstalk across all channels
• Load-independent operation with minimal phase and amplitude variation
• Modular architecture supports custom input/output configurations
• Exceptional line-voltage immunity with no measurable phase or amplitude degradation
– Typical Applications
• Atomic and crystal frequency standard distribution
• Precision calibration and metrology laboratories
• Multi-user timekeeping system distribution
• High-stability reference signal distribution
– Compatibility & Integration
The 5087A accepts signals from atomic frequency standards, crystal oscillators, and other precision frequency sources. Optional preamplifiers extend input sensitivity; output amplifiers are available as modular upgrades. Standard configurations (Option 031–034) are pre-configured for common frequency combinations.
