The HP/Agilent 5065A Rubidium Frequency Standard is a self-contained secondary frequency standard employing the hyperfine transition of Rubidium-87 to deliver exceptional frequency stability and accuracy. Designed for telecommunications, calibration laboratories, and metrology applications, this instrument provides a cost-effective reference signal where portability and versatility are priorities.
Technical Specifications
Frequency Stability
• Long-term drift: Better than 1 × 10⁻¹¹ per month
• Aging rate: Less than ±5 × 10⁻¹⁰ per 24 hours
• Temperature stability (0°C to +50°C): Less than 2.5 × 10⁻¹² total frequency change
• Load stability (open circuit to 50 Ω, L, or C load): ±2 × 10⁻¹² frequency change Output Specifications
• Output frequencies: 5 MHz, 1 MHz, 100 kHz
• Output voltage: Greater than 1 V rms into 50 Ω across all frequencies
• Harmonic distortion: Down more than 40 dB from rated output
• Nonharmonically related spurious content: Down more than 80 dB from rated output
• Signal-to-noise ratio (1 MHz and 5 MHz): Greater than 87 dB (30 kHz noise bandwidth)
• Connectors: BNC front and rear panels Clock Pulse Output (Option 001)
• Pulse rate: 1 pulse per second
• Rise/fall time: Less than 50 ns
• Amplitude: +10 V peak ±10%
• Jitter: 5 ns rms
• Pulse width: 20 ps minimum
• Load: 50 Ω Synchronization (Option 001)
• Automatic synchronization to ±10 ±1 ps relative to reference input
• Manual adjustment range: ±50 ns
• Reference input requirements: Greater than +5 V amplitude, rise time less than 50 ns, width greater than 0.5 ps (rear BNC) Power
• Operating voltages: 6 Vdc, 12 Vdc, 24 Vdc, or 115 Vac/230 Vac (±10%, 48–440 Hz)
• Standby battery (Option 002): 10-minute minimum capacity at 25°C after full charge Display
• 24-hour LED digital clock – Key Features • Multiple output frequencies accommodate diverse system requirements
• Low phase noise and excellent long-term stability eliminate drift-related calibration drift
• Optional 1 pps clock output with sub-nanosecond jitter for precision timing applications
• Optional synchronization to external reference with picosecond-level accuracy
• Multi-voltage input flexibility (DC and AC) simplifies deployment in varied power environments
• Optional standby battery ensures continuous operation during power interruption – Typical Applications • Frequency calibration and standards laboratories
• Telecommunications network synchronization
• Precision metrology and test systems
• GPS and timing reference backup
• Signal source for frequency measurement instruments – Compatibility & Integration The 5065A outputs standard BNC connectors on front and rear panels for direct integration into 50 Ω systems. External DC input via 5-pin jack accommodates custom power architectures. Optional battery modules (HP 5085A or K02-5060A) extend operational independence. Synchronization capability (Option 001) permits phase-locking to external references with millisecond-level adjustment granularity.
