The Stanford Research Systems PRS10 is a 10 MHz rubidium-disciplined crystal oscillator designed for applications requiring exceptional frequency stability and accuracy. It delivers low-phase-noise sine-wave output at 0.5 Vrms (±10%) into 50 Ω, making it ideal as a precision reference source for synthesizers, network synchronization, and frequency measurement systems. The unit achieves Stratum 1 performance through phase-locking to external references such as GPS, while its 1 nanosecond time-tagging resolution on external 1 pps inputs enables precise synchronization.
Technical Specifications
Output
• Frequency: 10 MHz sine wave into 50 Ω
• Amplitude: 0.5 Vrms, ±10%
• Phase noise (SSB): < –130 dBc/Hz (10 Hz offset); < –140 dBc/Hz (100 Hz offset)
• Spurious outputs: < –130 dBc (100 kHz bandwidth)
• Harmonic distortion: 25 dB
Stability
• Accuracy at shipment: ±5 × 10⁻¹¹
• Monthly aging: < 5 × 10⁻¹¹ (standard); < 2.5 × 10⁻¹¹ (with optional C)
• Yearly aging: < 5 × 10⁻¹⁰
• Short-term stability (Allan variance): < 2 × 10⁻¹¹ (1 s); < 1 × 10⁻¹¹ (10 s); < 2 × 10⁻¹² (100 s)
• Temperature stability: ±1 × 10⁻¹⁰ (–20 °C to +65 °C baseplate)
• Frequency retrace: ±5 × 10⁻¹¹ (72 hours off/on cycle)
• Holdover: 72-hour Stratum 1 level
• Settability: < 5 × 10⁻¹²
Control & Adjustment
• Trim range: ±2 × 10⁻⁹ (0 to 5 VDC); ±1 ppm (RS-232)
• 1 pps input time-tagging: 1 ns resolution
• External reference phase-locking with long time constants
– Key Features
• 72-hour Stratum 1 holdover performance
• RS-232 interface for diagnostics, control, and calibration
• Operating temperature range: –20 °C to +65 °C (baseplate)
• Storage temperature range: –55 °C to +85 °C
• Input voltage: +24 VDC nominal (+22 to +30 VDC range)
• 20-year design life
– Typical Applications
• Primary frequency reference for precision measurement systems
• Network synchronization and timing infrastructure
• GPS disciplining and holdover systems
• Synthesizer and test equipment references
– Compatibility & Integration
Optional accessories include breakout connector board (PRBB), benchtop heat sink (PRHS), D-type mating connector (PRMC), and 24 VDC switching power supply (PRPS). Low-power warm-up options are available.
