The Keysight/Agilent/HP 10811D is an oven-controlled crystal oscillator delivering a precise 10.000000 MHz reference signal for demanding metrology, communications, and test applications. This unit combines exceptional frequency stability with minimal aging, fast thermal stabilization, and low phase noise—making it ideal for systems requiring long-term accuracy without frequent recalibration.
## Technical Specifications
**Frequency & Output**
• Center frequency: 10.000000 MHz
• Output voltage: 0.55 V ± 0.05 V rms into 50 Ω
• Output voltage: 1 V rms ± 200 mV into 1 kΩ
• Harmonic distortion: < −25 dBc
• Spurious phase modulation: < −100 dBc (discrete sidebands 10 Hz to 25 kHz)
**Stability Performance**
• Temperature stability: < 4.5 × 10⁻⁹ from 0 °C to +71 °C
• Aging rate: < 5 × 10⁻¹⁰ per day
• Load stability: < 2.5 × 10⁻¹⁰ for 10% load change (< 1 × 10⁻¹⁰ typical)
• Acceleration sensitivity: < ±4 × 10⁻⁹ maximum for any reorientation; typically < 5 × 10⁻¹¹ for 2g turn-over
• Humidity stability: < 1 × 10⁻⁹ at 95% RH, 40 °C
• Altitude effect: < 2 × 10⁻⁹ from 0 to 50,000 ft
**Power & Environmental**
• Supply: 11.0 to 13.5 Vdc, 30 mA typical, 40 mA maximum
• Warm-up time: Typically 6 minutes
• Shock: 30 g, 11 ms, half-sine pulse
• Operating temperature: −55 °C to +71 °C
• Mass: 0.31 kg (11 oz)
## Key Features
• Oven-controlled design ensures drift mitigation across temperature and environmental extremes
• Low phase noise maintains signal integrity in complex measurement chains
• Minimal aging reduces calibration intervals and extends service life
• Fast warm-up minimizes system startup time
• Low power consumption reduces thermal load on host equipment
## Typical Applications
• Primary frequency reference in calibration laboratories
• Precision timing and synchronization in test systems
• Communication system frequency standards
• Phase-locked loop references requiring low noise
## Compatibility & Integration
The 10811D integrates via printed circuit connector card and mounts using two internally-threaded studs on the bottom cover. It functions as a drop-in replacement for the HP 10811A/B in most operational contexts.
